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# Index: I

i flag : sendmail, 30.8. Alphabetized F= Flags
I flag : sendmail, 30.8. Alphabetized F= Flags
I line (qf file) : sendmail, 23.9. The qf File Internals
$i macro
  sendmail, 14.2.3. The Message-ID: Header
  sendmail, 31.10. Alphabetized Reference
i option : (see IgnoreDots (i) option)
I option : (see ResolverOptions (I) option)
-i switch (sendmail) : sendmail, 36.7. Alphabetized Reference
-I switch (sendmail) : sendmail, 36.7. Alphabetized Reference
I-Heard-You (I-H-U) messages : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
I/O error : sendmail, 36.5.3. EX_IOERR A System I/O Error Occurred
ICMP (Internet Control Message Protocol)
  Building Internet Firewalls, 2.10. Network Management Services
  Building Internet Firewalls, 6.3.3.3. ICMP
  Building Internet Firewalls, C.5.2. Internet Control Message
  Practical UNIX & Internet Security, 16.2.4.1. ICMP
  TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
  echo
    Building Internet Firewalls, 8.12.3. ping
    (see also ping command)
  packets, configuring : Building Internet Firewalls, 8.12.5. Other ICMP Packets
  parameter problem message header : TCP/IP Network Administration, F.3. ICMP Parameter Problem Message Header
  returning error codes : Building Internet Firewalls, 6.4.2. Returning ICMP
  statement (in gated) : TCP/IP Network Administration, B.8.9. The icmp Statement
  tracing messages in : TCP/IP Network Administration, B.8.9. The icmp Statement
IDA sendmail
  sendmail, History
  TCP/IP Network Administration, 10. sendmail
IDEA (International Data Encryption Algorithm)
  Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems
  Practical UNIX & Internet Security, 6.6.3.1. Encrypting files with IDEA
identd daemon
  Practical UNIX & Internet Security, 17.3.12. Identification Protocol (auth) (TCP Port
  sendmail, 20.2.4. Verify identd Information
Identification field : TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
identification headers : sendmail, 35.6.4. Identification and Control Headers
identification protocol : Practical UNIX & Internet Security, 17.3.12. Identification Protocol (auth) (TCP Port
identifiers
  default user
    sendmail, 13.2.5. The Default User Identities
    sendmail, 22.8.3.1. The DefaultUser option
    sendmail, 34.8. Alphabetized Reference
  envelope (ENVID), DSN
    sendmail, 23.9. The qf File Internals
    sendmail, 36.7. Alphabetized Reference
  message
    sendmail, 13.4. Sending Mail
    sendmail, 14.2.3. The Message-ID: Header
    sendmail, 26.1.3.5. msgid= the Message-ID: identifier
  queue : (see queue identifier)
  queue file : (see $i macro)
  rule set : sendmail, 29.1.1. Rule-Set Numbers
  vendor : sendmail, 27.5.1. The vendor
identity
  user : (see usernames)
  system : sendmail, 31.7.1. Macros and the System Identity
IDENTPROTO macro : sendmail, 18.8. Alphabetized Reference
IDRP (InterDomain Routing Protocol) : TCP/IP Network Administration, 7.5.2. Border Gateway Protocol
IEEE 802.3 : TCP/IP Network Administration, 1.2. A Data Communications Model
IEEE Computer Society : Practical UNIX & Internet Security, F.1.7. IEEE Computer Society
Ierrs (input errors) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
IETF (Internet Engineering Task Force) : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  RFC page : TCP/IP Network Administration, 13.4. Retrieving RFCs
ifconfig
  TCP/IP Network Administration, 3.5.1. Reverse Address Resolution Protocol
  TCP/IP Network Administration, 6.1. The ifconfig Command
  TCP/IP Network Administration, 6.4.1. slattach
  TCP/IP Network Administration, 7.2. The Minimal Routing Table
  Linux implementation of : TCP/IP Network Administration, 7.3.1.1. Installing static routes at startup
  putting in startup files : TCP/IP Network Administration, 6.1.5.6. Putting ifconfig in the startup files
  setting values indirectly : TCP/IP Network Administration, 6.1.3. Assigning a Subnet Mask
  in troubleshooting
    TCP/IP Network Administration, 11.2. Diagnostic Tools
    TCP/IP Network Administration, 11.3. Testing Basic Connectivity
    TCP/IP Network Administration, 11.4.1. Troubleshooting with the ifconfig Command
IFS variable
  Practical UNIX & Internet Security, 5.5.3.2. Another SUID example: IFS and the /usr/lib/preserve
  Practical UNIX & Internet Security, 23.4. Tips on Writing SUID/SGID Programs
  attacks via : Practical UNIX & Internet Security, 11.5.1.2. IFS attacks
ignore (in Swatch command) : Practical UNIX & Internet Security, 10.6.2. The Swatch Configuration File
IgnoreDots (i) option
  sendmail, 34.1.3. Appropriateness of Options
  sendmail, 34.8. Alphabetized Reference
  sendmail, 36.7. Alphabetized Reference
ignoring illegal switches : sendmail, 36.7. Alphabetized Reference
IHL (Internet Header Length) : TCP/IP Network Administration, 1.5.1.1. The datagram
image content type : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
IMAP (Internet Message Access Protocol)
  TCP/IP Network Administration, 4.5.3. Planning Your Mail System
  TCP/IP Network Administration, 9.7.2. IMAP Server
imapd file : TCP/IP Network Administration, 9.7.2. IMAP Server
immutable attribute (BSD 4.4-Lite) : Building Internet Firewalls, 5.8.4.3. Mount filesystems as read-only
immutable files : Practical UNIX & Internet Security, 9.1.1. Immutable and Append-Only Files
implicit database class : sendmail, 33.8. Alphabetized Reference
import statement (in gated) : TCP/IP Network Administration, B.10.1. The import Statement
importing NIS accounts
  Practical UNIX & Internet Security, 19.4.1. Including or excluding specific accounts:
  Practical UNIX & Internet Security, 19.4.4.2. Using netgroups to limit the importing of accounts
imposter on Ethernet : TCP/IP Network Administration, 11.4.2.1. ARP problem case study
in-addr.arpa
  domain files
    TCP/IP Network Administration, 4.4.1.1. Obtaining an IN-ADDR.ARPA domain
    TCP/IP Network Administration, 8.3.5. The Reverse Domain File
    TCP/IP Network Administration, 11.6.4. dig: An Alternative to nslookup
    TCP/IP Network Administration, 13.6. The White Pages
  reverse domain files : TCP/IP Network Administration, C.3.1.6. Domain Name Pointer record
"In-Reply-To:" header line : sendmail, 35.10. Alphabetized Reference
in.named daemon : Practical UNIX & Internet Security, 16.2.6.1. DNS under UNIX
inbound
  packets : Building Internet Firewalls, 6.2.2. Be Careful of `Inbound'
    filtering rules for : Building Internet Firewalls, 6.8.6. It Should Apply Rules Separately to
    Telnet : Building Internet Firewalls, 6.7.2. Inbound Telnet Service
  services : Building Internet Firewalls, 10. Authentication and Inbound
INCDIRS= directive : sendmail, 18.4.3. INCDIRS=
incident response teams
  Building Internet Firewalls, 13.1.4.2. CERT-CC or other incident response
  Building Internet Firewalls, 13.4.4.2. CERT-CC and other incident response teams
  Building Internet Firewalls, A.5. Response Teams and Other Organizations
  resources for : Building Internet Firewalls, A.2.2. info.cert.org
incidents, attacks, threats
  TCP/IP Network Administration, 1.7. Application Layer
  TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  accidental : Building Internet Firewalls, 1.2.3. Stupidity and Accidents
  assessing
    Practical UNIX & Internet Security, 2.3.3. Adding Up the Numbers
    TCP/IP Network Administration, 12.1.1. Assessing the Threat
  back doors
    Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
    Practical UNIX & Internet Security, 6.2.3. Cryptographic Strength
    Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions
    Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
    Practical UNIX & Internet Security, 11.5. Protecting Yourself
    Practical UNIX & Internet Security, 27.1.2. Trusting Trust
    in MUDs and IRCs : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
  backup-related
    Practical UNIX & Internet Security, 7.1.6. Security for Backups
    Practical UNIX & Internet Security, 7.1.6.3. Data security for backups
  bacteria programs : Practical UNIX & Internet Security, 11.1.7. Bacteria and Rabbits
  biological threats : Practical UNIX & Internet Security, 12.2.1.7. Bugs (biological)
  broadcast storms : Practical UNIX & Internet Security, 25.3.2. Message Flooding
  via CGI scripts : Practical UNIX & Internet Security, 18.2.3.2. Testing is not enough!
  changing file owners : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner
  changing system clock : Practical UNIX & Internet Security, 5.1.5. File Times
  code breaking
    Practical UNIX & Internet Security, 6.1.1. Code Making and Code Breaking
    (see also cryptography)
  command channel : Building Internet Firewalls, 8.1. Electronic Mail
  commonly attacked accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts
  computer failures : Practical UNIX & Internet Security, 7.1.1.1. A taxonomy of computer failures
  contacting service providers about : Building Internet Firewalls, 13.4.4.3. Vendors and service providers
  data-driven attacks : Building Internet Firewalls, 8.1. Electronic Mail
  decode aliases : Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
  deep tree structures : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  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
  detecting, plan for : Building Internet Firewalls, 13.4.1. Planning for Detection
  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
  disposed materials : Practical UNIX & Internet Security, 12.3.3. Other Media
  DNS client flooding : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
  DNS nameserver attacks : Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks
  DNS zone transfers : Practical UNIX & Internet Security, 17.3.6.1. DNS zone transfers
  documenting
    Building Internet Firewalls, 13.1.5. Snapshot the System
    Building Internet Firewalls, 13.1.7. Document the Incident
    planning for : Building Internet Firewalls, 13.4.5. Planning for Snapshots
  dormant accounts
    Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
    Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts
  evaluating, plan for : Building Internet Firewalls, 13.4.2. Planning for Evaluation of the Incident
  false syslog entries : Practical UNIX & Internet Security, 10.5.3.1. Beware false log entries
  filename attacks : Practical UNIX & Internet Security, 11.5.1.4. Filename attacks
  having tools and supplies for : Building Internet Firewalls, 13.5.5. Keeping a Cache of Tools and Supplies
  hidden space : Practical UNIX & Internet Security, 25.2.2.7. Hidden space
  hijacking : Building Internet Firewalls, 10.1.1. Hijacking
  HOME variable attacks : Practical UNIX & Internet Security, 11.5.1.3. $HOME attacks
  identifying and quantifying
    Practical UNIX & Internet Security, 2.2.1.2. Identifying threats
    Practical UNIX & Internet Security, 2.2.2. Review Your Risks
  IFS variable attacks : Practical UNIX & Internet Security, 11.5.1.2. IFS attacks
  intruders/attackers
    Building Internet Firewalls, 1.2.1.1. Intrusion
    Practical UNIX & Internet Security, 1. Introduction
    TCP/IP Network Administration, 1.7. Application Layer
    TCP/IP Network Administration, 5.2. Linux Kernel Configuration
    (see also finger service)
    (see also firewalls)
    (see also TFTP)
    confronting : Practical UNIX & Internet Security, 24.2.2. What to Do When You Catch Somebody
    creating hidden files : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
    discovering
      Practical UNIX & Internet Security, 24.2. Discovering an Intruder
      Practical UNIX & Internet Security, 24.2.6. Anatomy of a Break-in
    legal options regarding : Practical UNIX & Internet Security, 26.1. Legal Options After a Break-in
    pursuing and capturing : Building Internet Firewalls, 13.3. Pursuing and Capturing the
    recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover
    responding to
      Practical UNIX & Internet Security, 24. Discovering a Break-in
      Practical UNIX & Internet Security, 24.7. Damage Control
    revealing DNS information to : Building Internet Firewalls, 8.10.4.3. Revealing too much information to
    reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans
    slower machines and : Building Internet Firewalls, 5.3.2. How Fast a Machine?
    tracking from log files : Practical UNIX & Internet Security, 24.3. The Log Files: Discovering an Intruder's
    types of : Building Internet Firewalls, 1.2.2. Types of Attackers
  letting in accidentally : Practical UNIX & Internet Security, 11.4. Entry
  logic bombs
    Practical UNIX & Internet Security, 11.1.3. Logic Bombs
    Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk
  mailing list for : Practical UNIX & Internet Security, E.1.3.9. RISKS
  media failure : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure
  meet-in-the-middle attacks : Practical UNIX & Internet Security, 6.4.5.1. Double DES
  MUD/IRC client programs : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
  multiple failed attacks : Building Internet Firewalls, 12.2.3. The Good, the Bad, and the Ugly
  newly created accounts : Practical UNIX & Internet Security, 24.4.1. New Accounts
  NIS, unintended disclosure : Practical UNIX & Internet Security, 19.4.5. Unintended Disclosure of Site Information with NIS
  notifying people about
    Building Internet Firewalls, 13.1.4. Make `Incident in Progress'
    Building Internet Firewalls, 13.4.4. Planning for Notification of People
    TCP/IP Network Administration, 12.4.2. Looking for Trouble
    TCP/IP Network Administration, 12.4.2.2. Checking login activity
  with NNTP : Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port
  open (guest) accounts
    Practical UNIX & Internet Security, 8.1.4. Open Accounts
    Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh
  password attacks : Building Internet Firewalls, 10.3.1. One-Time Passwords
  PATH variable attacks : Practical UNIX & Internet Security, 11.5.1.1. PATH attacks
  plaintext attacks : Practical UNIX & Internet Security, 6.2.3. Cryptographic Strength
  playback (replay) attacks : Practical UNIX & Internet Security, 19.6.1.2. Using the ticket granting ticket
  practicing drills for : Building Internet Firewalls, 13.5.7. Doing Drills
  programmed
    Practical UNIX & Internet Security, 11. Protecting Against Programmed Threats
    Practical UNIX & Internet Security, 11.6.2. Shared Libraries
    Practical UNIX & Internet Security, A.1.1.10. Chapter 11: Protecting Against Programmed Threats
    Practical UNIX & Internet Security, D.1.4. Computer Viruses and Programmed Threats
    authors of : Practical UNIX & Internet Security, 11.3. Authors
    damage from : Practical UNIX & Internet Security, 11.2. Damage
  recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover
    planning to : Building Internet Firewalls, 13.4.6. Planning for Restoration and Recovery
  replay attacks : Practical UNIX & Internet Security, 17.3.14. Network Time Protocol (NTP) (UDP Port 123)
  responding to
    Building Internet Firewalls, 12.2.5. Responding to Attacks
    Building Internet Firewalls, 13. Responding to Security Incidents
  reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans
  rsh, problems with : Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh
  sendmail problems : Practical UNIX & Internet Security, 17.3.4.1. sendmail and security
  spoofed network connection : Practical UNIX & Internet Security, 8.5.3.1. Trusted path
  start-up file attacks
    Practical UNIX & Internet Security, 11.5.2. Start-up File Attacks
    Practical UNIX & Internet Security, 11.5.2.7. Other initializations
  system clock : (see system clock)
  theft : (see theft)
  /tmp directory attacks : Practical UNIX & Internet Security, 25.2.4. /tmp Problems
  toll fraud : Practical UNIX & Internet Security, 14.4.1. One-Way Phone Lines
  traffic analysis : Practical UNIX & Internet Security, 18.4. Avoiding the Risks of Eavesdropping
  tree-structure attacks : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks
  Trojan horses
    Practical UNIX & Internet Security, 4.3.5. Using su with Caution
    Practical UNIX & Internet Security, 11.1.4. Trojan Horses
    Practical UNIX & Internet Security, 11.5. Protecting Yourself
    Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk
    Kerberos and : Practical UNIX & Internet Security, 19.6.5. Kerberos Limitations
    X clients : Practical UNIX & Internet Security, 17.3.21.2. X security
  trusted hosts : (see trusted hosts)
  types of : Building Internet Firewalls, 1.2. What Are You Trying To Protect
  unattended terminals
    Practical UNIX & Internet Security, 12.3.5. Unattended Terminals
    Practical UNIX & Internet Security, 12.3.5.2. X screen savers
  unowned files : Practical UNIX & Internet Security, 24.4.1.8. Unowned files
  vandalism
    Practical UNIX & Internet Security, 12.2.4. Vandalism
    Practical UNIX & Internet Security, 12.2.4.3. Network connectors
  viruses
    Building Internet Firewalls, 1.4.2.4. A firewall can't protect against
    Practical UNIX & Internet Security, 11.1. Programmed Threats: Definitions
    Practical UNIX & Internet Security, 11.1.5. Viruses
    Practical UNIX & Internet Security, 27.2.2. Viruses on the Distribution Disk
    bacteria programs : Practical UNIX & Internet Security, 11.1.7. Bacteria and Rabbits
    references on : Practical UNIX & Internet Security, D.1.4. Computer Viruses and Programmed Threats
  war and terrorism : Practical UNIX & Internet Security, 12.2.5. Defending Against Acts of War and Terrorism
  weakness-finding tools : Practical UNIX & Internet Security, 11.1.1. Security Tools
  by web browsers
    Practical UNIX & Internet Security, 18.5. Risks of Web Browsers
    Practical UNIX & Internet Security, 18.5.2. Trusting Your Software Vendor
  worms : Practical UNIX & Internet Security, 11.1.6. Worms
include command : sendmail, 16.2.1. include
*include* delivery agent : sendmail, 30.5.1. The *file* and *include* Agents
:include: directive
  sendmail, 22.5.2. Permissions for :include:
  sendmail, 23.9. The qf File Internals
  sendmail, 25.2. :include: Mailing Lists
  sendmail, 30.8. Alphabetized F= Flags
includes : (see server-side includes)
Includes option : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
IncludesNoExec option : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
incoming directories, FTP : Building Internet Firewalls, 8.2.1.6. Be careful of writable
incompatibility problems, handling : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
incremental backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups
indecent material : Practical UNIX & Internet Security, 26.4.5. Pornography and Indecent Material
indefinite tokens : TCP/IP Network Administration, 10.6.1. Pattern Matching
  substituting : TCP/IP Network Administration, 10.6.2. Transforming the Address
index.html file, absence of : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues
individual host assignment of addresses : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
inetd daemon
  Building Internet Firewalls, 5.8.2.1. How are services managed?
  Practical UNIX & Internet Security, 17.1.2. Starting the Servers
  Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  TCP/IP Network Administration, 5.4. The Internet Daemon
  denial-of-service attacks : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program
  modifying for anonymous FTP : Building Internet Firewalls, 8.2.1.3. Providing anonymous
  -nowait option : Practical UNIX & Internet Security, 25.3.1. Service Overloading
  starting bootpd from : TCP/IP Network Administration, 9.4. A BOOTP Server
  starting bootpgw from : TCP/IP Network Administration, 9.4.1. BOOTP gateway
  starting POP3 from : TCP/IP Network Administration, 9.7.1. POP Server
  -t (trace) option : Practical UNIX & Internet Security, 10.3.6. Logging Network Services
inetd.conf file
  Practical UNIX & Internet Security, 11.5.3.2. inetd.conf
  Practical UNIX & Internet Security, 17.3. Primary UNIX Network Services
  TCP/IP Network Administration, 5.4. The Internet Daemon
  TCP/IP Network Administration, 9.4. A BOOTP Server
  TCP/IP Network Administration, 12.3.1. Remove Unnecessary Software
  TCP/IP Network Administration, 12.4.2. Looking for Trouble
  editing in tcpd : TCP/IP Network Administration, 12.5.1. wrapper
inetinit script : TCP/IP Network Administration, 7.3.1.1. Installing static routes at startup
"Infinite loop in ruleset" error : sendmail, 28.6.2. Rewrite Once Prefix: $:
infinite loops, detecting possible : TCP/IP Network Administration, 10.6.2. Transforming the Address
information
  ensuring integrity of : TCP/IP Network Administration, 12.1.1. Assessing the Threat
  gathering, first phase in problem-solving : TCP/IP Network Administration, 11.1. Approaching a Problem
  lookup services, configuring : Building Internet Firewalls, 8.8. Information Lookup Services
  passing to users : TCP/IP Network Administration, 4.6. Informing the Users
    disseminating mask information : TCP/IP Network Administration, 4.2.2. Defining the Subnet Mask
  resources, finding : TCP/IP Network Administration, 13. Internet Information Resources
  theft and espionage
    Building Internet Firewalls, 1.2.1.3. Information Theft
    Building Internet Firewalls, 1.2.2.4. Spies (Industrial and
    Practical UNIX & Internet Security, 11.3. Authors
    (see also theft)
init program
  Practical UNIX & Internet Security, 5.3.2. Common umask Values
  Practical UNIX & Internet Security, C.5.1. Process #1: /etc/init
init.d directory : TCP/IP Network Administration, 9.1.1. NFS Daemons
  autofs script : TCP/IP Network Administration, 9.1.4. NFS Automounter
  inetinit script : TCP/IP Network Administration, 7.3.1.1. Installing static routes at startup
  sendmail script : TCP/IP Network Administration, 10.2. Running sendmail as a Daemon
initgroups command : sendmail, 34.8. Alphabetized Reference
Initial Sequence Number (ISN) : TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
initialization vector (IV) : Practical UNIX & Internet Security, 6.4.4.2. DES modes
initializing
  alias database : sendmail, 36.7. Alphabetized Reference
  environment variables
    Practical UNIX & Internet Security, 11.5.2.7. Other initializations
    sendmail, 36.4.2.1. Initialize the environment
  macros : sendmail, 36.4.2.2. Initialize macros
  system, files for : Practical UNIX & Internet Security, 11.5.3.5. System initialization files
inittab program
  Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer
  Practical UNIX & Internet Security, C.5.1. Process #1: /etc/init
INND program : Practical UNIX & Internet Security, 17.3.13. Network News Transport Protocol (NNTP) (TCP Port
inodes
  Practical UNIX & Internet Security, 5.1. Files
  Practical UNIX & Internet Security, 5.1.2. Inodes
  change time : (see ctime)
  for device files : Practical UNIX & Internet Security, 5.6. Device Files
  numbers for : sendmail, 23.9. The qf File Internals
  problems with : Practical UNIX & Internet Security, 25.2.2.3. Inode problems
input/output (I/O)
  checking for meta characters : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
  input errors (Ierrs) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
  portable library : Practical UNIX & Internet Security, 1.3. History of UNIX
insects : Practical UNIX & Internet Security, 12.2.1.7. Bugs (biological)
insecure networks : Building Internet Firewalls, 4.4.2. Insecure Networks
installation planning sheets : TCP/IP Network Administration, 4.6.1. Sample Planning Sheets
installing
  cables : Practical UNIX & Internet Security, 12.2.4.2. Network cables
  db library package : sendmail, C.3. Compile and Install
  filesystems as read-only : Building Internet Firewalls, 5.8.4.3. Mount filesystems as read-only
  Internet services : Building Internet Firewalls, 5.8.3. Installing and Modifying Services
  Kerberos : Practical UNIX & Internet Security, 19.6.3. Installing Kerberos
  kernel : Building Internet Firewalls, 5.8.4.1. Reconfigure and rebuild the kernel
  logging installations : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports
  operating system : Building Internet Firewalls, 5.8.1.1. Start with a minimal clean operating system
  physical security plan for : Practical UNIX & Internet Security, 12.1.1. The Physical Security Plan
  sendmail
    sendmail, 2.1. Get the Source
    sendmail, 18.6. Install sendmail
  sendmail.cf file : sendmail, 15.6. Install the client.cf File
  software on machine : Building Internet Firewalls, 5.8.4. Reconfiguring for Production
insurance
  Practical UNIX & Internet Security, 26.1. Legal Options After a Break-in
  Practical UNIX & Internet Security, 26.2.6. Other Tips
int domain : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
integrity
  Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
  Practical UNIX & Internet Security, 9. Integrity Management
  Practical UNIX & Internet Security, 9.3. A Final Note
  Practical UNIX & Internet Security, 11.1.5. Viruses
  Practical UNIX & Internet Security, 12.3. Protecting Data
  Practical UNIX & Internet Security, 12.3.6. Key Switches
  information : (see information)
  Kerberos : Practical UNIX & Internet Security, 19.6.1.3. Authentication, data integrity, and secrecy
  management checklist : Practical UNIX & Internet Security, A.1.1.8. Chapter 9: Integrity Management
  Secure RPC : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
  software for checking : Practical UNIX & Internet Security, 19.5.5. NIS+ Limitations
intelligent proxy servers : Building Internet Firewalls, 7.3.3. Intelligent Proxy Servers
interactive
  logins : TCP/IP Network Administration, 4.5.3. Planning Your Mail System
  mode : TCP/IP Network Administration, 8.4. Using nslookup
  protocols : TCP/IP Network Administration, 9.6. Managing Distributed Servers
InterDomain Routing Protocol (IDRP) : TCP/IP Network Administration, 7.5.2. Border Gateway Protocol
interfaces
  checking with ifconfig : TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig
  connectors : TCP/IP Network Administration, 1.2. A Data Communications Model
  determining name of : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  multiple : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  not enabled (*) : TCP/IP Network Administration, 6.1.1. Determining the Interface Name
  statements (in gated) : TCP/IP Network Administration, B.6. Interface Statements
interior router
  Building Internet Firewalls, 4.2.3.3. Interior router
  TCP/IP Network Administration, 12.7. Firewalls
  configuring : Building Internet Firewalls, 9.1.2.1. Interior Router
  merging with bastion host : Building Internet Firewalls, 4.3.4. It's Dangerous to Merge the Bastion
  merging with exterior router : Building Internet Firewalls, 4.3.2. It's OK to Merge the Interior Router and the Exterior Router
  multiple : Building Internet Firewalls, 4.3.5. It's Dangerous to Use Multiple
intermediate gateway : (see gateways)
Intermediate System to Intermediate System (IS-IS) protocol : TCP/IP Network Administration, 7.4. Interior Routing Protocols
intermediate systems : (see gateways)
intermittent problems : TCP/IP Network Administration, 11.4.2. Troubleshooting with the arp Command
internal
  bastion hosts : Building Internet Firewalls, 5.2.3. Internal Bastion Hosts
  clients, and proxying : Building Internet Firewalls, 7.4.5. Internal Versus External Clients
  firewalls : Building Internet Firewalls, 4.4. Internal Firewalls
    bastion hosts on : Building Internet Firewalls, 4.4.6. An Internal Firewall May or May Not
  mail, accepting only : sendmail, 20.2.1. Accept Mail Only From Our Domain
  mailing lists
    sendmail, 20.2.2. Workstation Refuses to Act as a Mail Gateway
    sendmail, 25.1. Internal Mailing Lists
  name for mail hub : sendmail, 11.4.2. A Word About ${HUB}
  news server : Building Internet Firewalls, 8.5.3.4. Relaying news through your bastion
  predefined macros : sendmail, 7.3. Predefined Macros
  rule sets : sendmail, 8.3. Rule Sets
  threats : TCP/IP Network Administration, 12.1.1. Assessing the Threat
internal keyword : TCP/IP Network Administration, 5.4. The Internet Daemon
international cryptography export
  Practical UNIX & Internet Security, 6.4.4.1. Use and export of DES
  Practical UNIX & Internet Security, 6.7.2. Cryptography and Export Controls
International Data Encryption Algorithm (IDEA)
  Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems
  Practical UNIX & Internet Security, 6.6.3.1. Encrypting files with IDEA
International Standards Organization (ISO)
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 11.9. Simple Network Management Protocol
internationalization : sendmail, 28.1.2.1. Backslashes in rules
Internet
  Practical UNIX & Internet Security, 16.1.1. The InternetWe recommend that readers
  Practical UNIX & Internet Security, 18. WWW Security
  (see also World Wide Web)
  addresses
    Practical UNIX & Internet Security, 16.2.1. Internet Addresses
    Practical UNIX & Internet Security, 16.2.1.3. CIDR addresses
    sendmail, 17.1.3. Internet Addresses
    TCP/IP Network Administration, 10.7.1. Modifying Local Information
  conferencing services, real-time : Building Internet Firewalls, 2.8. Real-Time Conferencing
  connected or non-connected to : TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks
  connections to unbuilt bastion host : Building Internet Firewalls, 5.8. Building a Bastion Host
  Control Message Protocol : (see ICMP)
  daemon : (see inetd daemon)
  defense in depth : Building Internet Firewalls, 3.2. Defense in Depth
  domain as NIS domain : Practical UNIX & Internet Security, 19.4.3. NIS Domains
  email over : (see email)
  firewalls : (see firewalls)
  future of IP addresses : Building Internet Firewalls, 4.5. What the Future Holds
  global
    TCP/IP Network Administration, 3.2. The Host Table
    TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks
    TCP/IP Network Administration, 12.6. Encryption
  layer, TCP/IP : Building Internet Firewalls, C.5. Internet Layer
  logging activity on : (see logs/logging)
  military origins of : TCP/IP Network Administration, 1.1. TCP/IP and the Internet
  multicasting : Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
  multiple connections to : Building Internet Firewalls, 4.3.6. It's OK to Use
  Protocol : (see IP)
  rapid growth of
    TCP/IP Network Administration, Foreword from the First Edition
    TCP/IP Network Administration, 1.1. TCP/IP and the Internet
    TCP/IP Network Administration, 2.2.1. Address Classes
    TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
  Relay Chat : (see IRC)
  routing architecture
    Building Internet Firewalls, C.10. Internet Routing Architecture
    TCP/IP Network Administration, 2.4. Internet Routing Architecture
  search programs for : Building Internet Firewalls, 2.6. Other Information Services
  security resource : Building Internet Firewalls, A.3.5. CERT-Advisory
  servers : (see servers, Internet)
  services : (see services, Internet)
  Worm program : Practical UNIX & Internet Security, 1. Introduction
  WWW : (see World Wide Web)
Internet Control Message Protocol (ICMP)
  Building Internet Firewalls, 2.10. Network Management Services
  Building Internet Firewalls, 6.3.3.3. ICMP
  Building Internet Firewalls, C.5.2. Internet Control Message
  Practical UNIX & Internet Security, 16.2.4.1. ICMP
  TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
  echo
    Building Internet Firewalls, 8.12.3. ping
    (see also ping command)
  packets, configuring : Building Internet Firewalls, 8.12.5. Other ICMP Packets
  parameter problem message header : TCP/IP Network Administration, F.3. ICMP Parameter Problem Message Header
  returning error codes : Building Internet Firewalls, 6.4.2. Returning ICMP
  statement (in gated) : TCP/IP Network Administration, B.8.9. The icmp Statement
  tracing messages in : TCP/IP Network Administration, B.8.9. The icmp Statement
Internet Control Protocol (IPCP) : TCP/IP Network Administration, 6.2.1. The Serial Protocols
Internet Engineering Task Force (IETF) : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  RFC page : TCP/IP Network Administration, 13.4. Retrieving RFCs
Internet Header Length (IHL) : TCP/IP Network Administration, 1.5.1.1. The datagram
Internet Layer : TCP/IP Network Administration, 1.5. Internet Layer
Internet Message Access Protocol (IMAP)
  TCP/IP Network Administration, 4.5.3. Planning Your Mail System
  TCP/IP Network Administration, 9.7.2. IMAP Server
Internet Packet Exchange (IPX) : Practical UNIX & Internet Security, 16.4.1. IPX
Internet Protocol (IP) : TCP/IP Network Administration, 1.5.1. Internet Protocol
Internet Registries
  TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  TCP/IP Network Administration, 4.3.1. Obtaining an autonomous system number
Internet Relay Chat (IRC) : Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
Internet Resource Registries (IRR) : TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
Internet Routing Registry (IRR) : TCP/IP Network Administration, 2.4. Internet Routing Architecture
Internet Security Scanner (ISS) : Practical UNIX & Internet Security, 17.6.2. ISS
Internet Service Providers : (see ISPs)
Internet Software Consortium (ISC) : TCP/IP Network Administration, 9.5. DHCP
Internet Talk Radio
  TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  TCP/IP Network Administration, 5.3.1.1. Options
InterNIC
  TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
  TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
  TCP/IP Network Administration, 8.3.3. The Cache Initialization File
  TCP/IP Network Administration, 11.6.3. Cache corruption
  TCP/IP Network Administration, 13.6. The White Pages
interoperability : (see DHCP; POP; routers and routing)
intervals
  queue processing interval : sendmail, 23.6.1. Periodically with -q
  return interval : sendmail, 13.2.2. Limit the Life of Queued Messages
intranets : TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks
intruders/attackers
  Practical UNIX & Internet Security, 1. Introduction
  TCP/IP Network Administration, 1.7. Application Layer
  TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  (see also finger service)
  (see also firewalls)
  (see also incidents, attacks, threats)
  (see also TFTP)
  confronting : Practical UNIX & Internet Security, 24.2.2. What to Do When You Catch Somebody
  creating hidden files : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
  discovering
    Practical UNIX & Internet Security, 24.2. Discovering an Intruder
    Practical UNIX & Internet Security, 24.2.6. Anatomy of a Break-in
  legal options regarding : Practical UNIX & Internet Security, 26.1. Legal Options After a Break-in
  pursuing and capturing : Building Internet Firewalls, 13.3. Pursuing and Capturing the
  recovering from : Building Internet Firewalls, 13.1.6. Restore and Recover
  responding to
    Practical UNIX & Internet Security, 24. Discovering a Break-in
    Practical UNIX & Internet Security, 24.7. Damage Control
  revealing DNS information to : Building Internet Firewalls, 8.10.4.3. Revealing too much information to
  reviewing response strategies : Building Internet Firewalls, 13.4.8. Periodic Review of Plans
  slower machines and : Building Internet Firewalls, 5.3.2. How Fast a Machine?
  tracking from log files : Practical UNIX & Internet Security, 24.3. The Log Files: Discovering an Intruder's
  types of : Building Internet Firewalls, 1.2.2. Types of Attackers
"invalid ruleset name" error : sendmail, 29.1. The S Configuration Command
ioctl system call : Practical UNIX & Internet Security, C.1.3.4. Process groups and sessions
IP (Internet Protocol)
  Building Internet Firewalls, 6.3.2. IP
  Building Internet Firewalls, C.5.1. Internet Protocol
  TCP/IP Network Administration, 1.5.1. Internet Protocol
  Building Internet Firewalls, C.9. The IP Address
  encryption : Building Internet Firewalls, 10.5.2. What Do You Encrypt?
  fragmentation : Building Internet Firewalls, 6.3.2.2. IP fragmentation
  multicasting : Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)
  nested over IP : Building Internet Firewalls, 6.3.3.5. IP over IP
  packet routes to : (see traceroute utility)
  source route option : Building Internet Firewalls, 6.3.2.1. IP options
  status and control messages : Building Internet Firewalls, 6.3.3.3. ICMP
  Version 6 (IPv6) : Building Internet Firewalls, 6.3.6. IP Version 6
IP addresses
  Building Internet Firewalls, 2.9. Name Service
  Building Internet Firewalls, 6.3.6. IP Version 6
  Building Internet Firewalls, C.9. The IP Address
  TCP/IP Network Administration, 2.2. The IP Address
  TCP/IP Network Administration, 6.1. The ifconfig Command
  classless : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  controlling access by : Practical UNIX & Internet Security, 17.2. Controlling Access to Servers
  depletion of : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
  future of : Building Internet Firewalls, 4.5. What the Future Holds
  incorrect : TCP/IP Network Administration, 11.4.1. Troubleshooting with the ifconfig Command
  name service and
    Practical UNIX & Internet Security, 16.2.6. Name Service
    Practical UNIX & Internet Security, 16.2.6.2. Other naming services
  private : Building Internet Firewalls, 4.5. What the Future Holds
  restricting access by : Practical UNIX & Internet Security, 18.3. Controlling Access to Files on Your Server
  unique : TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
IP datagrams
  forwarding : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  headers for : TCP/IP Network Administration, F.1. IP Datagram Header
IP numbers, monitoring : Practical UNIX & Internet Security, 12.3.1.2. Eavesdropping by Ethernet and 10Base-T
IP packets
  (see packet sniffing)
  (see packet switching)
  (see packets)
IP protocols
  Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems
  Practical UNIX & Internet Security, 16.2.4. Packets and Protocols
  Practical UNIX & Internet Security, 16.2.4.3. UDP
IP routers
  Building Internet Firewalls, C.5.1.2. Routing datagrams
  (see also gateways)
IP security
  Practical UNIX & Internet Security, 16.3. IP Security
  Practical UNIX & Internet Security, 16.3.3. Authentication
IP services : (see network services)
IP spoofing
  Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems
  Practical UNIX & Internet Security, 16.3. IP Security
IP_SRCROUTE macro : sendmail, 18.8. Alphabetized Reference
IPC (interprocessor communications) : sendmail, 6.2. Define a Mail Delivery Agent
IPCP (Internet Control Protocol) : TCP/IP Network Administration, 6.2.1. The Serial Protocols
IPv4 (IP Version 4)
  Practical UNIX & Internet Security, 16.2. IPv4: The Internet Protocol Version 4
  Practical UNIX & Internet Security, 16.2.6.2. Other naming services
IPv6 : TCP/IP Network Administration, 2.2.2. Classless IP Addresses
IPX (Internet Packet Exchange)
  Practical UNIX & Internet Security, 16.4.1. IPX
  TCP/IP Network Administration, A.2. The PPP Daemon
IRC (Internet Relay Chat)
  Building Internet Firewalls, 2.8. Real-Time Conferencing
  Practical UNIX & Internet Security, 17.3.23. Other TCP Ports: MUDs and Internet Relay Chat (IRC)
  configuring : Building Internet Firewalls, 8.9.2. Internet Relay Chat
IRIX wtmpx file : Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
irq parameter : TCP/IP Network Administration, 6.1.5.5. Point-to-point
IRR (Internet Resource Registries)
  TCP/IP Network Administration, 2.4. Internet Routing Architecture
  TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
IS (intermediate system)
  TCP/IP Network Administration, 1.7. Application Layer
  TCP/IP Network Administration, B.8.4. The isis Statement
IS-IS protocol : TCP/IP Network Administration, B.8.4. The isis Statement
  trace options : TCP/IP Network Administration, B.8.4. The isis Statement
ISC (Internet Software Consortium)
  TCP/IP Network Administration, 9.5. DHCP
  TCP/IP Network Administration, D.1. Compiling dhcpd
ISDN interface : TCP/IP Network Administration, 5.2. Linux Kernel Configuration
  experimental : TCP/IP Network Administration, 5.3.1.3. Devices
isis statement (in gated) : TCP/IP Network Administration, B.8.4. The isis Statement
ISN (Initial Sequence Number) : TCP/IP Network Administration, 1.6.2. Transmission Control Protocol
ISPs (Internet Service Providers)
  Practical UNIX & Internet Security, 27.2.6. Network Providers that Network Too Well
  TCP/IP Network Administration, 1.1. TCP/IP and the Internet
  TCP/IP Network Administration, 4.1. Connected and Non-Connected Networks
  TCP/IP Network Administration, 6.3.2. Dial-Up PPP
  choosing : TCP/IP Network Administration, 4.1.1. Network Contacts
  interconnections among : TCP/IP Network Administration, 7.5.2. Border Gateway Protocol
  services of : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
ISS (Internet Security Scanner)
  Building Internet Firewalls, B.2.5. ISS
  Practical UNIX & Internet Security, 17.6.2. ISS
  Practical UNIX & Internet Security, E.4.4. ISS (Internet Security Scanner)ISS

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