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# Index: D

D configuration command
  sendmail, 5.3.2. Macros
  sendmail, 7.1. Overview
  sendmail, 31.3. Configuration File Definitions
d flag : sendmail, 30.8. Alphabetized F= Flags
D flag
  sendmail, 14.2.2. The Date: Header
  sendmail, 30.8. Alphabetized F= Flags
D line (host status file) : sendmail, B.1. Status file lines
D line (qf file) : sendmail, 23.9. The qf File Internals
$d macro : sendmail, 31.10. Alphabetized Reference
d option : (see DeliveryMode (d) option)
D option : (see AutoRebuildAliases (D) option)
.D rule-testing command : sendmail, 38.2.1. Define a Macro with .D
-d switch (makemap) : sendmail, 33.2.1.1. -d allow duplicate keys
-d switch (sendmail)
  sendmail, 4.3. Debugging (-d)
  sendmail, 36.7. Alphabetized Reference
  sendmail, 37.1. The Syntax of -d
  complete list of switches : sendmail, 37.5. Reference in Numerical Order
  -d0.1 switch
    sendmail, 7.3.1. The hostname
    sendmail, 11.6. Handling user@thishost
    sendmail, 37.5. Reference in Numerical Order
  -d0.15 switch
    sendmail, 6.3.3. Testing the New Delivery Agent Definitions
    sendmail, 37.5. Reference in Numerical Order
  -d0.4 switch
    sendmail, 31.7.1. Macros and the System Identity
    sendmail, 37.5. Reference in Numerical Order
  -d21.12 switch
    sendmail, 10.5. Details of Rule Flow
    sendmail, 37.5. Reference in Numerical Order
  -d35.9 switch
    sendmail, 7.3. Predefined Macros
    sendmail, 37.5. Reference in Numerical Order
  -d37.1 switch
    sendmail, 13.3. Testing the Options
    sendmail, 37.5. Reference in Numerical Order
  with rule testing : sendmail, 38.7. Add Debugging for Detail
D= equate : sendmail, 30.4. The Equates
DAC (Discretionary Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)
daemon
  TCP/IP Network Administration, 3.2. The Host Table
  TCP/IP Network Administration, 5.4. The Internet Daemon
  options for : sendmail, 34.8. Alphabetized Reference
  preventing from running : sendmail, 15.5. Prevent the Daemon from Running
  privacy of : sendmail, 34.8. Alphabetized Reference
  signals : sendmail, 26.3. Signaling the Daemon
  tools for : Building Internet Firewalls, B.5. Daemons
  user
    Practical UNIX & Internet Security, 4.1. Users and Groups
    sendmail, 14.6. Trusted User
    TCP/IP Network Administration, 5.4. The Internet Daemon
daemon mode
  sendmail, 3.4. Role as a Daemon
  sendmail, 4.1.1. Daemon Mode (-bd)
  sendmail, 36.7. Alphabetized Reference
DaemonPortOptions (O) option : sendmail, 34.8. Alphabetized Reference
damage, liability for : Practical UNIX & Internet Security, 26.4.6. Liability for Damage
"dangerous write permissions" warning : sendmail, 22.5.1. Dangerous Write Permissions
dash (hyphen)
  in machine conversation : sendmail, 4.2. Verbose (-v)
  non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands
DAT (Digital Audio Tape) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
data : Building Internet Firewalls, 1.1.1. Your Data
  assigning owners to : Practical UNIX & Internet Security, 2.4.4.1. Assign an owner
  availability of : Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
  communication equipment (DCE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  communications model : TCP/IP Network Administration, 1.2. A Data Communications Model
  communications protocols : (see TCP/IP services)
  compression, not provided in SLIP : TCP/IP Network Administration, 6.2.1. The Serial Protocols
  confidential
    Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
    Practical UNIX & Internet Security, 2.5.2. Confidential Information
  disclosure of : Practical UNIX & Internet Security, 11.2. Damage
  DNS
    Building Internet Firewalls, 8.10.3. DNS Data
    Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname
  espionage
    Building Internet Firewalls, 1.2.2.4. Spies (Industrial and
    Practical UNIX & Internet Security, 11.3. Authors
  giving away with NIS : Practical UNIX & Internet Security, 19.4.5. Unintended Disclosure of Site Information with NIS
  identifying assets : Practical UNIX & Internet Security, 2.2.1.1. Identifying assets
  protecting from sniffers : Building Internet Firewalls, 10.1.2. Packet Sniffing
  spoofing : Practical UNIX & Internet Security, 16.3. IP Security
  terminal equipment (DTE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  theft of : (see information, theft and espionage)
  transferring
    Building Internet Firewalls, 6. Packet Filtering
    (see email; files, transferring)
    allowing/disallowing : Building Internet Firewalls, 6.1. Why Packet Filtering?
    via TCP : Building Internet Firewalls, 6.3.3.1. TCP
  user-specified, and proxying : Building Internet Firewalls, 7.4.4. User-Specified Data
Data Carrier Detect (DCD) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
DATA command, in SMTP : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol
Data Defense Network (DDN) : Practical UNIX & Internet Security, F.3.4.20. MILNET
Data Encryption Standard : (see DES)
DATA keyword : sendmail, 4.2. Verbose (-v)
Data Link Layer
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 5.3.1.2. Pseudo-device
  TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  in PPP : TCP/IP Network Administration, 6.2.1. The Serial Protocols
Data Set Ready (DSR) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
Data Terminal Ready (DTR)
  Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
  TCP/IP Network Administration, A.2. The PPP Daemon
data terminology : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
data-driven attacks : Building Internet Firewalls, 8.1. Electronic Mail
database files : Practical UNIX & Internet Security, 1.2. What Is an Operating System?
database macros : sendmail, 33. Database Macros
databases : (see networks and networking, databases, network)
  classes for : sendmail, 33.8. Alphabetized Reference
  external (keyed)
    sendmail, 5.3.11. Keyed Databases
    sendmail, 20.3. Alphabetized V8.8 Subroutines
  K command types : sendmail, 33.3.2. The class
  library support : sendmail, 18.4.1. DBMDEF=
  m4 and : sendmail, 33.6. Database Maps and m4
  /map rule-testing command : sendmail, 38.5.3. Look up a Database Item with /map
  sendmail : TCP/IP Network Administration, 10.6.2.1. Transforming with a database
  User Database
    sendmail, 33.5. The User Database
    sendmail, 33.8. Alphabetized Reference
    sendmail, 34.8. Alphabetized Reference
datagrams
  Building Internet Firewalls, C.5.1.1. The datagram
  TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
  TCP/IP Network Administration, 1.5.1.1. The datagram
  TCP/IP Network Administration, 1.7. Application Layer
  (see also IP datagrams)
  (see also User Datagram Protocol)
  connectionless delivery of : TCP/IP Network Administration, 1.6. Transport Layer
  converting source address of : TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  forwarding : TCP/IP Network Administration, 5.3.1.1. Options
  fragmented
    Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
    TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
    TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  headers
    TCP/IP Network Administration, 2.7.1. Protocol Numbers
    TCP/IP Network Administration, 2.7.2. Port Numbers
  marking end of : TCP/IP Network Administration, 6.2.1. The Serial Protocols
  routing : TCP/IP Network Administration, 1.5.1.2. Routing datagrams
  silently discarding : TCP/IP Network Administration, 11.8. Protocol Case Study
date : (see time and date)
date command
  Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
  Practical UNIX & Internet Security, 24.5.1. Never Trust Anything Except Hardcopy
"Date:" header line
  sendmail, 1.5. The Header
  sendmail, 14.2.2. The Date: Header
  sendmail, 30.8. Alphabetized F= Flags
  sendmail, 35.10. Alphabetized Reference
day-zero backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups
db library package
  sendmail, 2.4.1. Eliminate or Keep db Support?
  sendmail, 18.8. Alphabetized Reference
  sendmail, C.1. Overview
  compiling and installing : sendmail, C.3. Compile and Install
dbm database : sendmail, 33.8. Alphabetized Reference
  alias file and
    sendmail, 22.6.1. The Alias Database Files
    sendmail, 24.5. The Aliases Database
dbx debugger : Practical UNIX & Internet Security, C.4. The kill Command
DCC (Direct Client Connections) : Building Internet Firewalls, 8.9.2. Internet Relay Chat
DCD (Data Carrier Detect) modem control line : TCP/IP Network Administration, A.2. The PPP Daemon
DCE (data communication equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
DCE (Distributed Computing Environment)
  Practical UNIX & Internet Security, 3.2.2. The /etc/passwd File
  Practical UNIX & Internet Security, 8.7.3. Code Books
  Practical UNIX & Internet Security, 16.2.6.2. Other naming services
  Practical UNIX & Internet Security, 19.2. Sun's Remote Procedure Call (RPC)
  Practical UNIX & Internet Security, 19.7.1. DCE
dd command
  Practical UNIX & Internet Security, 6.6.1.2. Ways of improving the security of crypt
  Practical UNIX & Internet Security, 7.4.1. Simple Local Copies
DDN (Data Defense Network)
  Building Internet Firewalls, C.10. Internet Routing Architecture
  Practical UNIX & Internet Security, F.3.4.20. MILNET
  TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
  Protocol Handbook : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture
deadlock : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
debug command
  Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  sendmail, 22.3.1. SMTP debug
debug_dumpstate rule set : sendmail, 26.3.3.3. -- ruleset debug_dumpstate returns stat ..., pv: --
debugfs command : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
debugging
  Building Internet Firewalls, 6.1.2.1. Current filtering tools are not perfect
  sendmail, 4.3. Debugging (-d)
  sendmail, 6.3.3. Testing the New Delivery Agent Definitions
  sendmail, 37.2. Debugging Behavior
  TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
  TCP/IP Network Administration, C.1.1. Signal Processing
  (see also bugs)
  (see also -d switch (sendmail))
  (see also testing)
  (see also troubleshooting)
  operating system : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs
  with rule testing : sendmail, 38.7. Add Debugging for Detail
  SMTPDEBUG macro
    sendmail, 18.8. Alphabetized Reference
    sendmail, 22.3.1. SMTP debug
debugging mode : sendmail, 36.7. Alphabetized Reference
DEC (Digital Equipment Corporation) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)
decentralizing management : TCP/IP Network Administration, 2.3. Subnets
declaring
  classes
    sendmail, 12.1.1. Declaring a Class
    sendmail, 32.1. Class Configuration Commands
  delivery agents : sendmail, 19.3.2. MAILER()
  macros
    sendmail, 7.2. Defining Macros
    sendmail, 31.2. Command-Line Definitions
  sites for SITECONFIG : sendmail, 19.6. Alphabetized m4 Macros
  trusted users : (see T configuration command)
DECnet network
  Practical UNIX & Internet Security, 16.4.3. DECnet
  sendmail, 3.3.3. Other Protocols
  $C macro : sendmail, 31.10. Alphabetized Reference
DECNET-RELAY macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
decode alias
  Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  sendmail, 22.6. The Aliases File
decryption
  TCP/IP Network Administration, 12.6. Encryption
  (see encryption)
dedicated connections
  TCP/IP Network Administration, 6.3.1. The PPP Daemon
  TCP/IP Network Administration, 6.4. Installing SLIP
dedicated proxy servers : Building Internet Firewalls, 7.3.2. Generic Versus Dedicated Proxies
defamation : Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation
default
  accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts
  canonicalization : sendmail, 28.6.6.2. Default in canonicalization: $:
  character set : sendmail, 30.4. The Equates
  content-type character set : sendmail, 34.8. Alphabetized Reference
  database key : sendmail, 33.4.1. Specify a Default with $:
  delivery agent : sendmail, 34.8. Alphabetized Reference
  delivery mode : sendmail, 13.2.3. The Default Delivery Mode
  deny : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny
  domain
    Practical UNIX & Internet Security, 16.2.3. Hostnames
    TCP/IP Network Administration, 3.3.3. Domain Names
    TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
    how used : TCP/IP Network Administration, 3.3.3. Domain Names
  file permissions : sendmail, 13.2.4. The Default File Permissions
  gateway
    TCP/IP Network Administration, 2.5. The Routing Table
    TCP/IP Network Administration, 4.3. Planning Routing
    address : TCP/IP Network Administration, 4. Getting Started
  hostname : sendmail, 33.5.3. A :default Outgoing Hostname
  logging level : sendmail, 13.2.6. The Default Logging Level
  macro definitions : sendmail, 7.3. Predefined Macros
  mask : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  passwords : TCP/IP Network Administration, 12.2. User Authentication
  permit : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny
  route
    TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
    TCP/IP Network Administration, 2.5. The Routing Table
    TCP/IP Network Administration, 7.3. Building a Static Routing Table
    defining : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed
  sender's address format : sendmail, 31.10. Alphabetized Reference
  User Database location : sendmail, 18.8. Alphabetized Reference
  user identity
    sendmail, 13.2.5. The Default User Identities
    sendmail, 22.8.3.1. The DefaultUser option
    sendmail, 34.8. Alphabetized Reference
  values : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
default deny stance
  Building Internet Firewalls, 3.5.1. Default Deny Stance: That Which Is Not
  Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny
default permit stance
  Building Internet Firewalls, 3.5.2. Default Permit Stance: That Which Is
  Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny
DefaultCharSet option : sendmail, 34.8. Alphabetized Reference
defaultdomain file : TCP/IP Network Administration, 9.3. Network Information Service
defaultroute option : TCP/IP Network Administration, 6.3.1. The PPP Daemon
DefaultUser (u,g) option
  sendmail, 13.2.5. The Default User Identities
  sendmail, 22.8.3.1. The DefaultUser option
  sendmail, 34.8. Alphabetized Reference
Defense Communications Agency (DCA) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet
Defense Data Network (DDN) : Building Internet Firewalls, C.10. Internet Routing Architecture
defense in depth
  Building Internet Firewalls, 3.2. Defense in Depth
  Building Internet Firewalls, 9.2.3.2. Defense in depth
define() : sendmail, 20.3. Alphabetized V8.8 Subroutines
define macro (in sendmail)
  TCP/IP Network Administration, E.3. m4 sendmail Macros
  TCP/IP Network Administration, E.3.1. define
define statements (m4)
  sendmail, 19.1. The m4 Preprocessor
  sendmail, 19.4.1. Options
defining
  headers : (see H configuration command)
  macros
    sendmail, 20.3. Alphabetized V8.8 Subroutines
    sendmail, 34.8. Alphabetized Reference
    sendmail, 36.7. Alphabetized Reference
    sendmail, 38.2.1. Define a Macro with .D
definition statements (in gated) : TCP/IP Network Administration, B.7. Definition Statements
delay= equate (syslog output) : sendmail, 26.1.3.2. delay= total time to deliver
delay, transaction : sendmail, 26.1.3.13. xdelay= transaction
delays, inserting
  TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
DELETE key : Practical UNIX & Internet Security, 3.4. Changing Your Password
deleting
  destructive attack via : Practical UNIX & Internet Security, 25.1. Destructive Attacks
  files : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
  header lines : sendmail, 20.3. Alphabetized V8.8 Subroutines
delimiters
  database key column : sendmail, 33.3.4.12. -z specify the column delimiter (V8.7 and above)
  tokens
    sendmail, 31.10. Alphabetized Reference
    sendmail, 34.8. Alphabetized Reference
"Delivered-To:" header line : sendmail, 35.10. Alphabetized Reference
delivermail program : sendmail, History
delivery
  sendmail, 19.6. Alphabetized m4 Macros
  (see also users)
  alias, forms of : sendmail, 24.2. Forms of Alias Delivery
  failure count : sendmail, 23.9. The qf File Internals
  via FAX machine : sendmail, 3.3.3. Other Protocols
  to files : (see appending to files)
  local
    sendmail, 3.2. Role in Local Delivery
    sendmail, 29.6.3. Delivering to Local Recipient
    sendmail, 30.8. Alphabetized F= Flags
    (see local)
  looking up addresses with DNS : sendmail, 21.2.3. Look Up Addresses for Delivery
  to mailbox : sendmail, 3.2.1. Delivery to a Mailbox
  to multiple recipients : sendmail, 30.8. Alphabetized F= Flags
  path of : (see "Received:" header line)
  precedence : (see priority, message)
  to programs
    sendmail, 3.2.2. Delivery Through a Program
    sendmail, 24.2.3. Delivery via Programs
    sendmail, 25.7.4. Piping Through Programs
    sendmail, 30.8. Alphabetized F= Flags
  relays : (see relays)
  single threaded : sendmail, 34.8. Alphabetized Reference
  total time for : sendmail, 26.1.3.2. delay= total time to deliver
delivery agents (MTAs)
  Building Internet Firewalls, 8.1. Electronic Mail
  sendmail, 1.1. MUA Versus MTA
  sendmail, 5.3.1. Mail Delivery Agents
  sendmail, 6.2. Define a Mail Delivery Agent
  sendmail, 30. Delivery Agents
  (see also M configuration command)
  $# operator and
    sendmail, 9.2.1. The Delivery Agent ($#)
    sendmail, 28.6.5. Specify a Delivery Agent: $#
  advantages to sendmail : sendmail, 18.1. To Use or Not to Use
  choosing
    sendmail, 9. Rule Set 0
    sendmail, 9.5. Things to Try
  declaring : sendmail, 19.3.2. MAILER()
  default : sendmail, 34.8. Alphabetized Reference
  equates for : sendmail, 30.4. The Equates
  for errors : sendmail, 9.4. The error Delivery Agent
  expensive
    sendmail, 23.6.1. Periodically with -q
    sendmail, 30.8. Alphabetized F= Flags
    sendmail, 34.8. Alphabetized Reference
  flags
    sendmail, 6.3. The local Delivery Agent
    sendmail, 6.4. Add the Missing Parts to Mhub
    sendmail, 14.2. Headers Versus Delivery Agent Flags
    sendmail, 30.8. Alphabetized F= Flags
    sendmail, 35.4. ?flags? in Header Definitions
  ignoring MX records : sendmail, 21.3.5. What? They Ignore MX Records?
  local
    sendmail, 6.3. The local Delivery Agent
    sendmail, 19.6. Alphabetized m4 Macros
  logging : sendmail, 26.1.3.4. mailer= the delivery agent used
  printing list of : sendmail, 38.4.2. Show Delivery Agents with =M
  as recipients : sendmail, 30.8. Alphabetized F= Flags
  scripts via : sendmail, 24.3. Write a Delivery Agent Script
  statistics : (see statistics)
  symbolic name : sendmail, 30.2. The Symbolic Name
  testing : sendmail, 38.5.6. Try a Delivery Agent with /try
  UUCP : sendmail, 19.4.6. UUCP
delivery mode : sendmail, 13.2.3. The Default Delivery Mode
delivery program : sendmail, 25.7.5.1. The deliver program
Delivery Status Notification : (see DSN)
DeliveryMode (d) option
  sendmail, 13.2.3. The Default Delivery Mode
  sendmail, 23.6.1. Periodically with -q
  sendmail, 34.8. Alphabetized Reference
Demilitarized Zone (DMZ) : Building Internet Firewalls, 4.1. Some Firewall Definitions
demo accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts
demultiplexing : TCP/IP Network Administration, 2.7. Protocols, Ports, and Sockets
denial of service
  Building Internet Firewalls, 1.2.1.2. Denial of Service
  Practical UNIX & Internet Security, 1.5. Role of This Book
  Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X
  Practical UNIX & Internet Security, 25. Denial of Service Attacks and Solutions
  Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
  Practical UNIX & Internet Security, 25.3.4. Clogging
  TCP/IP Network Administration, 12.1.1. Assessing the Threat
  accidental
    Building Internet Firewalls, 1.2.3. Stupidity and Accidents
    Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
  automatic lockout : Practical UNIX & Internet Security, 3.3. Entering Your Password
  checklist for : Practical UNIX & Internet Security, A.1.1.24. Chapter 25: Denial of Service Attacks and Solutions
  destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks
  disk attacks
    Practical UNIX & Internet Security, 25.2.2. Disk Attacks
    Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  inodes : Practical UNIX & Internet Security, 25.2.2.3. Inode problems
  internal inetd services : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  on networks
    Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
    Practical UNIX & Internet Security, 25.3.4. Clogging
  overload attacks
    Practical UNIX & Internet Security, 25.2. Overload Attacks
    Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
  via syslog : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File
  system overload attacks : Practical UNIX & Internet Security, 25.2.1.2. System overload attacks
  X Window System : Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X
departure of employees : Practical UNIX & Internet Security, 13.2.6. Departure
depository directories, FTP : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
dequote database
  sendmail, 33.8. Alphabetized Reference
  TCP/IP Network Administration, 10.7.1. Modifying Local Information
DES (Data Encryption Standard)
  Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems
  Practical UNIX & Internet Security, 6.4.4. DES
  Practical UNIX & Internet Security, 6.4.5.2. Triple DES
  Practical UNIX & Internet Security, 6.6.2. des: The Data Encryption Standard
  Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups
  Practical UNIX & Internet Security, 8.6.1. The crypt()
  (see also authentication)
  authentication (NIS+) : Practical UNIX & Internet Security, 19.5.4. Using NIS+
  improving security of
    Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
    Practical UNIX & Internet Security, 6.4.5.2. Triple DES
designated router : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
designing firewalls : Building Internet Firewalls, 1.4.3. Buying Versus Building
destination
  TCP/IP Network Administration, 1.7. Application Layer
  (see also unreachable destinations, detecting)
  fields : TCP/IP Network Administration, 2.5. The Routing Table
  host : TCP/IP Network Administration, 2.5. The Routing Table
Destination Address
  TCP/IP Network Administration, 1.5.1.1. The datagram
  TCP/IP Network Administration, 2.2. The IP Address
Destination Port number
  TCP/IP Network Administration, 1.6.1. User Datagram Protocol
  TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
destination unreachable codes : (see ICMP)
Destination Unreachable Message : TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
destroying media : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal
destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks
detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
detail data, DSN delivery : sendmail, 30.5.2.1. The $@ dsn part
detectors
  cable tampering : Practical UNIX & Internet Security, 12.3.1.1. Wiretapping
  carbon-monoxide : Practical UNIX & Internet Security, 12.2.1.2. Smoke
  humidity : Practical UNIX & Internet Security, 12.2.1.11. Humidity
  logging alarm systems : Practical UNIX & Internet Security, 10.7.1.1. Exception and activity reports
  smoke : Practical UNIX & Internet Security, 12.2.1.2. Smoke
  temperature alarms : Practical UNIX & Internet Security, 12.2.1.6. Temperature extremes
  water sensors : Practical UNIX & Internet Security, 12.2.1.12. Water
Deutsches Forschungsnetz : Practical UNIX & Internet Security, F.3.4.14. Germany: DFN-WiNet Internet sites
/dev directory
  Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
  TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections
  /dev/audio device : Practical UNIX & Internet Security, 23.8. Picking a Random Seed
  /dev/console device : Practical UNIX & Internet Security, 5.6. Device Files
  /dev/kmem device
    Practical UNIX & Internet Security, 5.6. Device Files
    Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
    sendmail, 18.8. Alphabetized Reference
  /dev/null device
    Practical UNIX & Internet Security, 5.6. Device Files
    sendmail, 5.2. The Minimal File
  /dev/random device : Practical UNIX & Internet Security, 23.7.4. Other random number generators
  /dev/swap device : Practical UNIX & Internet Security, 5.5.1. SUID, SGID, and Sticky Bits
  /dev/urandom device : Practical UNIX & Internet Security, 23.7.4. Other random number generators
device statement : TCP/IP Network Administration, 5.3.1.3. Devices
devices : Practical UNIX & Internet Security, 5.6. Device Files
  managing with SNMP : Practical UNIX & Internet Security, 17.3.15. Simple Network Management Protocol (SNMP) (UDP Ports
  modem control : Practical UNIX & Internet Security, 14.5.2. Setting Up the UNIX Device
  numbers for : sendmail, 23.9. The qf File Internals
Devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
df -i command : Practical UNIX & Internet Security, 25.2.2.3. Inode problems
df files
  sendmail, 3.1.2. The Queue Directory
  sendmail, 23.2.2. The Data (Message Body) File: df
  sendmail, 23.9. The qf File Internals
  inode and device information : sendmail, 23.9. The qf File Internals
dfstab file
  TCP/IP Network Administration, 9.1.2.1. The share command
  TCP/IP Network Administration, 9.1.5.1. NFS print services
dgram sockets : TCP/IP Network Administration, 5.4. The Internet Daemon
DHCP (Dynamic Host Configuration Protocol)
  TCP/IP Network Administration, Preface
  TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
  interoperability and : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
  backwards-compatible : TCP/IP Network Administration, 9.5. DHCP
  based on Bootstrap Protocol (BOOTP) : TCP/IP Network Administration, 9.4.2. BOOTP extensions
  benefits of : TCP/IP Network Administration, 9.5. DHCP
  daemon (dhcpd) : TCP/IP Network Administration, 9.5.1. dhcpd.conf
    command : TCP/IP Network Administration, D.2. The dhcpd Command
    compiling : TCP/IP Network Administration, D.1. Compiling dhcpd
    configuring : TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File
    tools reference : TCP/IP Network Administration, D. A dhcpd Reference
    using latest versions of : TCP/IP Network Administration, D. A dhcpd Reference
  dhcpd.conf file : TCP/IP Network Administration, 9.5.1. dhcpd.conf
  dhcpd.pid file : TCP/IP Network Administration, D.2. The dhcpd Command
  options available with : TCP/IP Network Administration, D.3.3. DHCP Options
    commonly used : TCP/IP Network Administration, D.3.3.1. Commonly used options
    others : TCP/IP Network Administration, D.3.3.2. Other options
diagnostic tools : TCP/IP Network Administration, 11.2. Diagnostic Tools
diagramming the system : Building Internet Firewalls, 13.5.2. Labeling and Diagraming Your System
dial-up connections : TCP/IP Network Administration, 6.3.1. The PPP Daemon
dial-up IP (dip)
  TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  TCP/IP Network Administration, 6.4.2. Dial-Up IP
  script file : TCP/IP Network Administration, A.1.1. The dip Script File
    for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
    sample : TCP/IP Network Administration, A.1.1.1. A sample dip script
    special variables, listed : TCP/IP Network Administration, A.1.1. The dip Script File
  tools reference : TCP/IP Network Administration, A.1. Dial-Up IP
dial-up PPP : TCP/IP Network Administration, 6.3.2. Dial-Up PPP
DialDelay option : sendmail, 34.8. Alphabetized Reference
dictionary attacks
  Building Internet Firewalls, 10.3.1. One-Time Passwords
  Practical UNIX & Internet Security, 8.6.1. The crypt()
  TCP/IP Network Administration, 12.2. User Authentication
Diffie-Hellman key exchange system
  Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
  Practical UNIX & Internet Security, 18.6. Dependence on Third Parties
  Practical UNIX & Internet Security, 19.3. Secure RPC (AUTH_DES)
  breaking key : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
  exponential key exchange : Practical UNIX & Internet Security, 19.3.1. Secure RPC Authentication
dig
  TCP/IP Network Administration, 11.2. Diagnostic Tools
  TCP/IP Network Administration, 11.3. Testing Basic Connectivity
  TCP/IP Network Administration, 11.6.4. dig: An Alternative to nslookup
digest multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
Digital Audio Tape (DAT) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
digital computers : Practical UNIX & Internet Security, 6.1.2. Cryptography and Digital Computers
Digital Equipment Corporation (DEC) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)
Digital Signature Algorithm : (see DSA)
digital signatures
  Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms
  Practical UNIX & Internet Security, 6.5. Message Digests and Digital Signatures
  Practical UNIX & Internet Security, 6.5.5.2. Message authentication codes
  Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
  TCP/IP Network Administration, 12.6. Encryption
  checksums
    Building Internet Firewalls, 5.8.5.3. About checksums for auditing
    Practical UNIX & Internet Security, 6.5.5.1. Checksums
    Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures
    TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
    TCP/IP Network Administration, 11.8. Protocol Case Study
    keeping secure : Building Internet Firewalls, 13.5.3. Keeping Secured Checksums
    recalculating
      TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
      TCP/IP Network Administration, 5.3.1.1. Options
    using Tripwire for : Building Internet Firewalls, 5.8.5.1. Auditing packages
  detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures
  with PGP : Practical UNIX & Internet Security, 6.6.3.4. Adding a digital signature to an announcement
Digital UNIX
  Practical UNIX & Internet Security, 1.3. History of UNIX
  (see also Ultrix)
Dijkstra Shortest Path First (SPF) algorithm : TCP/IP Network Administration, 7.4.3. Open Shortest Path First
dip (dial-up IP)
  TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  TCP/IP Network Administration, 6.4.2. Dial-Up IP
  script file : TCP/IP Network Administration, A.1.1. The dip Script File
    for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
    sample : TCP/IP Network Administration, A.1.1.1. A sample dip script
  tools reference : TCP/IP Network Administration, A.1. Dial-Up IP
diphosts file : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration
diplogin command : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration
Direct Client Connections (DCC) : Building Internet Firewalls, 8.9.2. Internet Relay Chat
direct delivery : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol
directive statements (in gated) : TCP/IP Network Administration, B.3. Directive Statements
directives, Makefile : sendmail, 18.4. Tuning Makefile
directories
  Practical UNIX & Internet Security, 5.1.1. Directories
  Practical UNIX & Internet Security, 5.1.3. Current Directory and Paths
  ancestor : Practical UNIX & Internet Security, 9.2.2.2. Ancestor directories
  backing up by : Practical UNIX & Internet Security, 7.1.3. Types of Backups
  CDFs (context-dependent files) : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
  cf : sendmail, 16.1. The cf/cf Directory
  checklist for : Practical UNIX & Internet Security, A.1.1.4. Chapter 5: The UNIX Filesystem
  dot, dot-dot, and / : Practical UNIX & Internet Security, 5.1.1. Directories
  FTP depositories : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
  immutable : Practical UNIX & Internet Security, 9.1.1. Immutable and Append-Only Files
  listing automatically (Web) : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
  mounted
    Practical UNIX & Internet Security, 5.5.5. Turning Off SUID and SGID in Mounted Filesystems
    Practical UNIX & Internet Security, 19.3.2.5. Mounting a secure filesystem
  nested : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  NFS : (see NFS)
  permissions : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
  queue : (see queue directory)
  read-only : Practical UNIX & Internet Security, 9.1.2. Read-only Filesystems
  recipient's home : sendmail, 31.10. Alphabetized Reference
  requirement for mounting : TCP/IP Network Administration, 9.1.3. Mounting Remote Filesystems
  restricted
    Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem
    Practical UNIX & Internet Security, 8.1.5.2. Checking new software
  root : (see root directory)
  for safe file writes : sendmail, 34.8. Alphabetized Reference
  SGI and sticky bits on : Practical UNIX & Internet Security, 5.5.6. SGID and Sticky Bits on Directories
  Web server structure of
    Practical UNIX & Internet Security, 18.2.2. Understand Your Server's Directory Structure
    Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
  world-writable : Practical UNIX & Internet Security, 11.6.1.1. World-writable user files and directories
directory statement : TCP/IP Network Administration, 8.3.1.2. Primary and secondary server configurations
<Directory> blocks
  Practical UNIX & Internet Security, 18.3.1. The access.conf and .htaccess Files
  Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
  Practical UNIX & Internet Security, 18.3.2.1. Examples
disabling Internet services : Building Internet Firewalls, 5.8.2. Disabling Nonrequired Services
disabling routing : (see routers and routing, disabling)
disasters and disaster recovery
  Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime
  sendmail, 21.5. Prepare for Disaster
  TCP/IP Network Administration, 11.10. Summary
  TCP/IP Network Administration, 12.1.1. Assessing the Threat
  TCP/IP Network Administration, 12.1.3. Writing a Security Policy
  TCP/IP Network Administration, 12.8. Words to the Wise
disclosure of information, threat of : TCP/IP Network Administration, 12.1.1. Assessing the Threat
disconnecting after incident : Building Internet Firewalls, 13.1.2. Disconnect or Shut Down, as
disconnecting machine : Building Internet Firewalls, 13.4.3. Planning for Disconnecting or
disk attacks
  Practical UNIX & Internet Security, 25.2.2. Disk Attacks
  Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
disk quotas : Practical UNIX & Internet Security, 25.2.2.5. Using quotas
disk space : (see memory; resources)
diskettes : (see backups; media)
disks, needs for : Building Internet Firewalls, 5.3.3. What Hardware Configuration?
dismissed employees : Practical UNIX & Internet Security, 13.2.6. Departure
dismounting directories, by booting : TCP/IP Network Administration, 9.1.3.1. The mount command
disposing of materials : Practical UNIX & Internet Security, 12.3.3. Other Media
Distfile : TCP/IP Network Administration, 9.6.1. rdist
distributed
  architecture : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
  control : TCP/IP Network Administration, 12.1.2. Distributed Control
  servers, managing : TCP/IP Network Administration, 9.6. Managing Distributed Servers
Distributed Computing Environment : (see DCE)
Distributed File System (DFS) : TCP/IP Network Administration, 3.7.1. File Sharing
distributing public keys : TCP/IP Network Administration, 12.6. Encryption
diversity of defense systems : Building Internet Firewalls, 3.7. Diversity of Defense
divert command (m4)
  sendmail, 19.1.4. m4 diversions
  sendmail, 19.6. Alphabetized m4 Macros
dividing problem into manageable pieces : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints
DMBDEF variable : TCP/IP Network Administration, E.4.4. The sendmail K Command
DMBDEF= directive : sendmail, 18.4.1. DBMDEF=
dmesg command : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
DMZ (Demilitarized Zone) : Building Internet Firewalls, 4.1. Some Firewall Definitions
dnl command (m4) : sendmail, 19.1.2. m4 and dnl
DNS (Domain Name Service)
  Building Internet Firewalls, 2.9. Name Service
  Building Internet Firewalls, 5.6. Selecting Services Provided by the
  Practical UNIX & Internet Security, 16.2.6. Name Service
  Practical UNIX & Internet Security, 16.2.6.2. Other naming services
  Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
  Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks
  sendmail, 17.2.1. Is the Host Local?
  sendmail, 21.1. Overview
  TCP/IP Network Administration, 1.7. Application Layer
  TCP/IP Network Administration, 3.1. Names and Addresses
  TCP/IP Network Administration, 3.3. Domain Name Service
  (see also name service)
  benefits of
    TCP/IP Network Administration, 3.3. Domain Name Service
    TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
  bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
  configuring : Building Internet Firewalls, 8.10. Domain Name System
    in screened host architecture : Building Internet Firewalls, 9.2.1.6. DNS
    in screened subnet architecture : Building Internet Firewalls, 9.1.1.6. DNS
    without hiding information : Building Internet Firewalls, 8.10.6. Setting up DNS Without Hiding
  data : Building Internet Firewalls, 8.10.3. DNS Data
  disasters : sendmail, 21.5. Prepare for Disaster
  eliminating support for : sendmail, 2.4.2. Eliminate DNS Support
  error numbers : sendmail, B.1. Status file lines
  fake server : Building Internet Firewalls, 8.10.5.1. Set up a `fake'
  hiding information with : Building Internet Firewalls, 8.10.5. Setting Up DNS to Hide
  MX records
    Building Internet Firewalls, 8.10.5.1. Set up a `fake'
    Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
    sendmail, 15.3. MX Records
    sendmail, 18.8. Alphabetized Reference
    sendmail, 21.3. Set Up MX Records
    sendmail, 34.8. Alphabetized Reference
    sendmail, 38.5.2. Look Up MX Records with /mx
    TCP/IP Network Administration, 8.3.2. Standard Resource Records
    TCP/IP Network Administration, 8.3.6. The named.hosts File
    TCP/IP Network Administration, 8.4. Using nslookup
    TCP/IP Network Administration, 10.7.1. Modifying Local Information
    TCP/IP Network Administration, C.3.1.4. Mail exchanger record
    0 flag : sendmail, 30.8. Alphabetized F= Flags
    bestmx database class : sendmail, 33.8. Alphabetized Reference
    bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
    fallback MX host : sendmail, 34.8. Alphabetized Reference
    ignored by delivery agents : sendmail, 21.3.5. What? They Ignore MX Records?
    looking up for addresses : sendmail, 21.2.3. Look Up Addresses for Delivery
    offsite hosts : sendmail, 21.5.1. Offsite MX Hosts
    with wildcards : sendmail, 21.3.4. Wildcard MX Records
  nameserver attacks : Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks
  omitting support : sendmail, 19.6. Alphabetized m4 Macros
  querying : TCP/IP Network Administration, 10.7.1. Modifying Local Information
  resource on : sendmail, Other Books, Other Problems
  revealing information to attackers : Building Internet Firewalls, 8.10.4.3. Revealing too much information to
  rogue servers : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  security and : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  server for internal hosts : Building Internet Firewalls, 8.10.5.2. Set up a real DNS
  starting : TCP/IP Network Administration, 5.4. The Internet Daemon
  tuning lookups : sendmail, 34.8. Alphabetized Reference
  zone transfers
    Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
    Practical UNIX & Internet Security, 17.3.6.1. DNS zone transfers
docs/warnings file : TCP/IP Network Administration, 12.4.3.1. COPS
documentation
  Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
  Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
  historical, of problems : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints
  incidents : Building Internet Firewalls, 13.1.7. Document the Incident
  plan for : Building Internet Firewalls, 13.4.7. Planning for Documentation
  sendmail
    sendmail, Additional Sources of Information
    sendmail, 2.2. Read the Documents
  system after incident
    Building Internet Firewalls, 13.1.5. Snapshot the System
    Building Internet Firewalls, 13.4.5. Planning for Snapshots
  using : TCP/IP Network Administration, 4.6. Informing the Users
dollar sign ($)
  $ line (qf file) : sendmail, 23.9. The qf File Internals
  $ rule-testing command : sendmail, 38.3.1. Dump a Defined Macro with $
  in macro names : sendmail, 31.5. Macro Expansion: $ and $&
  wildcard operators
    sendmail, 8.7. Wildcard Operators
    (see also wildcard operators)
  $1, $2, ... : (see positional operators)
  $&
    sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
    sendmail, 31.5.3. Use Value as Is with $&
  $> : sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
  $* : sendmail, 10.2.1. The LHS
  $@
    sendmail, 9.2.2. The Host ($@)
    sendmail, 9.3. Testing Rule Set 0
    sendmail, 11.4.1. Rewrite the Lone Username
    sendmail, 17.1.1.3. Handle null address
    sendmail, 28.6.3. Rewrite-and-Return Prefix: $@
    sendmail, 30.5.2.1. The $@ dsn part
    sendmail, 33.4.2. Specify Numbered Substitution with $@
  $[ and $]
    sendmail, 19.6. Alphabetized m4 Macros
    sendmail, 21.2.4. The $[ and $] Operators
    sendmail, 28.6.6. Canonicalize Hostname: $[ and $]
    sendmail, 33.4.3. $[ and $]: A Special Case
  $:
    sendmail, 9.2.3. The User ($:)
    sendmail, 9.3. Testing Rule Set 0
    sendmail, 28.6.2. Rewrite Once Prefix: $:
    sendmail, 29.6.1. Further Processing: $:user
    sendmail, 30.5.3. The $: Part
    sendmail, 33.4.1. Specify a Default with $:
    sendmail, 33.4. Use Maps with $( and $) in Rules
  $.
    sendmail, 14.1.3. Testing So Far
    sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  $=
    sendmail, 12.1. The Class Command
    sendmail, 32.2.1. Matching Any in a Class: $=
    sendmail, 38.3.2. Dump a Class Macro with $=
  $#
    sendmail, 9.2.1. The Delivery Agent ($#)
    sendmail, 28.6.5. Specify a Delivery Agent: $#
  $- : sendmail, 11.4.1. Rewrite the Lone Username
  $( and $) : sendmail, 33.4. Use Maps with $( and $) in Rules
  $+ : sendmail, 8.7. Wildcard Operators
  $?
    sendmail, 14.1.3. Testing So Far
    sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  $~ : sendmail, 32.2.2. Matching Any Not in a Class: $~
  $| : sendmail, 31.6. Macro Conditionals: $?, $|, and $.
  $_ macro
    sendmail, 20.2.4. Verify identd Information
    sendmail, 23.9. The qf File Internals
    sendmail, 26.1.3.9. relay= the host that sent or accepted the message
    sendmail, 31.10. Alphabetized Reference
DOL macro (m4) : sendmail, 19.6. Alphabetized m4 Macros
DOMAIN() : sendmail, 19.3.3. DOMAIN()
DOMAIN macro (in sendmail) : TCP/IP Network Administration, E.3. m4 sendmail Macros
Domain Name Pointer records : (see PTR resource records)
Domain Name Service : (see DNS)
domain names
  Practical UNIX & Internet Security, 16.2.3. Hostnames
  sendmail, 8.1. A Fictional Network
  sendmail, 19.6. Alphabetized m4 Macros
  sendmail, 31.10. Alphabetized Reference
  TCP/IP Network Administration, 3.3.3. Domain Names
  TCP/IP Network Administration, 4. Getting Started
  application form : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
  fully qualified : TCP/IP Network Administration, 3.3.3. Domain Names
  in NIS : TCP/IP Network Administration, 9.3. Network Information Service
  obtaining : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
  parameter : TCP/IP Network Administration, 9.4. A BOOTP Server
DOMAIN source file (in sendmail)
  TCP/IP Network Administration, E.3.2. FEATURE
  TCP/IP Network Administration, E.3.4. DOMAIN
  mail relay defines, listed : TCP/IP Network Administration, E.3.4. DOMAIN
domain-type addresses : sendmail, 17.1.3. Internet Addresses
domain/named.root : TCP/IP Network Administration, 11.6.3. Cache corruption
domainname command
  Practical UNIX & Internet Security, 19.4.3. NIS Domains
  TCP/IP Network Administration, 9.3. Network Information Service
domains
  Practical UNIX & Internet Security, 19.4.3. NIS Domains
  TCP/IP Network Administration, 1.7. Application Layer
  accepting only internal mail : sendmail, 20.2.1. Accept Mail Only From Our Domain
  adding to recipient address : sendmail, 30.8. Alphabetized F= Flags
  administration
    TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
    TCP/IP Network Administration, 8.1. BIND: UNIX Name Service
    contacting : TCP/IP Network Administration, 13.6. The White Pages
  allocating : (see Network Information Center)
  always_add_domain feature : sendmail, 19.6. Alphabetized m4 Macros
  creating : TCP/IP Network Administration, 3.3.2. Creating Domains and Subdomains
  downloading an entire : TCP/IP Network Administration, 8.4. Using nslookup
  entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
  FQDN : (see FQDNs)
  hierarchy
    TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
    TCP/IP Network Administration, 8.1. BIND: UNIX Name Service
  list of local : sendmail, 32.5. Alphabetized Reference
  masquerading : sendmail, 19.6. Alphabetized m4 Macros
  name servers : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
    parameter : TCP/IP Network Administration, 9.4. A BOOTP Server
  organizational : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
  part of hostname : (see $m macro)
  virtual, mapping to addresses : sendmail, 19.6. Alphabetized m4 Macros
domaintable database
  TCP/IP Network Administration, 10.7.1. Modifying Local Information
  sendmail, 19.6. Alphabetized m4 Macros
DontExpandCNames option : sendmail, 34.8. Alphabetized Reference
DontInitGroups option : sendmail, 34.8. Alphabetized Reference
DontPruneRoutes command : sendmail, 34.8. Alphabetized Reference
dormant accounts
  Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
  Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
dot (.)
  . line (qf file) : sendmail, 23.9. The qf File Internals
  checking for in ${pd} : sendmail, D.1. Sun Enhancements
  for current directory : Practical UNIX & Internet Security, 5.1.1. Directories
  to end messages
    sendmail, 4.2. Verbose (-v)
    sendmail, 30.8. Alphabetized F= Flags
  filenames starting with, disabling creation of : Building Internet Firewalls, 8.2.1.6. Be careful of writable
  host status file line : sendmail, B.1. Status file lines
  leading in messages : sendmail, 34.8. Alphabetized Reference
  trailing in FQDNs
    sendmail, 15.3. MX Records
    sendmail, 17.4. Rule Set 4
    sendmail, 29.5.1. Stripping Trailing Dots
  .. directory : Practical UNIX & Internet Security, 5.1.1. Directories
  .. for domain name : TCP/IP Network Administration, C.3.1. Standard Resource Records
dotted decimal notation : TCP/IP Network Administration, 2.3. Subnets
Double DES : Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
double quotation marks (")
  sendmail, 13.2.8. The Unquoted Space Replacement Character
  sendmail, 31.3.2. Syntax of the Configuration File Macro's Text
double-reverse lookups
  Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname
  Building Internet Firewalls, 8.10.5.1. Set up a `fake'
DoubleBounceAddress option : sendmail, 34.8. Alphabetized Reference
DOW USA : Practical UNIX & Internet Security, F.3.4.10. DOW USADOW USA
down sites : sendmail, 23.7.1. Handling a Down Site
downloading files : Practical UNIX & Internet Security, 12.3.4. Protecting Local Storage
  logging
    Practical UNIX & Internet Security, 10.3.3. xferlog Log File
    Practical UNIX & Internet Security, 10.3.5. access_log Log File
downtime : Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime
  due to criminal investigations : Practical UNIX & Internet Security, 26.2.4. Hazards of Criminal Prosecution
  logging : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
drand48 function : Practical UNIX & Internet Security, 23.7.3. drand48 ( ), lrand48 ( ), and mrand48 ( )
Drawbridge package : Building Internet Firewalls, B.3.2. Drawbridge
drills, security : Practical UNIX & Internet Security, 24.1.3. Rule #3: PLAN AHEAD
drink : Practical UNIX & Internet Security, 12.2.2.1. Food and drink
ds.internic.net : TCP/IP Network Administration, 13.4. Retrieving RFCs
DSA (Digital Signature Algorithm)
  Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
  Practical UNIX & Internet Security, 6.5.3. Digital Signatures
DSN (Delivery Status Notification)
  sendmail, 6.3. The local Delivery Agent
  sendmail, B.1. Status file lines
  DSN macro : sendmail, 18.8. Alphabetized Reference
  ENVID identifier
    sendmail, 23.9. The qf File Internals
    sendmail, 36.7. Alphabetized Reference
  ORCPT address : sendmail, 23.9. The qf File Internals
  original envelope ID : sendmail, 31.10. Alphabetized Reference
  types for : (see T= equate)
DTE (data terminal equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
du command : Practical UNIX & Internet Security, 25.2.2.1. Disk-full attacks
dual-homed hosts
  Building Internet Firewalls, 7. Proxy Systems
  (see also proxy servers/services)
  architecture of : Building Internet Firewalls, 4.2.1. Dual-Homed Host Architecture
    with screen subnet architecture : Building Internet Firewalls, 4.3.8. It's OK to Use
  as firewall : Building Internet Firewalls, 5.8.2.5. Turning off routing
  nonrouting : Building Internet Firewalls, 5.2.1. Nonrouting Dual-homed Hosts
  proxy services and : (see proxy servers/services)
dual universes : Practical UNIX & Internet Security, 5.9.1. Dual Universes
ducts, air : Practical UNIX & Internet Security, 12.2.3.2. Entrance through air ducts
dummy interface : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
dump : TCP/IP Network Administration, 7.7.2. Testing the Configuration
dump/restore program
  Practical UNIX & Internet Security, 7.1.3. Types of Backups
  Practical UNIX & Internet Security, 7.4.3. Specialized Backup Programs
  Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups
dumping macros : sendmail, 38.3. Dump a Macro
dumping state : sendmail, 26.3.3. SIGUSR1 Dump States
dumpster diving : Practical UNIX & Internet Security, 12.3.3. Other Media
duplicate database keys : sendmail, 33.2.1.1. -d allow duplicate keys
duplicate entries in alias file : sendmail, 24.4.4. Duplicate Entries and Automation
duress code : Practical UNIX & Internet Security, 8.7.2. Token Cards
dust : Practical UNIX & Internet Security, 12.2.1.3. Dust
dynamic
  assignment of addresses
    TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
    TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
    automatic under DHCP : TCP/IP Network Administration, 9.5. DHCP
    circumstances favoring : TCP/IP Network Administration, 4.3. Planning Routing
  packet filtering
    Building Internet Firewalls, 6.3.3.2. UDP
    Building Internet Firewalls, 8.2.1.1. Packet filtering characteristics of
  port allocation : TCP/IP Network Administration, 2.7.3. Sockets
  routing
    TCP/IP Network Administration, 4.3. Planning Routing
    TCP/IP Network Administration, 7.1. Common Routing Configurations
Dynamic DNS : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol : (see DHCP)
dynamic-bootp flag : TCP/IP Network Administration, D.3.2. Configuration Parameters
dynamic-bootp-lease-cutoff parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf
dynamic-bootp-lease-length parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf

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