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# Index: O

O configuration command
  sendmail, 5.3.7. Options
  sendmail, 13.1. Options: An Overview
-o database switch : sendmail, 33.3.4.8. -o the database file is optional (V8.1 and above)
-O database switch : sendmail, 33.3.4.7. -O adaptive versus never add a null (V8.2 and above)
o flag : sendmail, 30.8. Alphabetized F= Flags
O lines in sendmail.cf : sendmail, 3.1. Role in the Filesystem
$o macro : (see OperatorChars (o) option)
o option : (see OldStyleHeaders (o) option)
O option : (see DaemonPortOptions (O) option)
-o switch (F command) : sendmail, 12.2. The File Form of Class
-o switch (makemap) : sendmail, 33.2.1.4. -o append to, don't overwrite the file
-o switch (sendmail) : sendmail, 36.7. Alphabetized Reference
-O switch (sendmail) : sendmail, 36.7. Alphabetized Reference
OBJADD= directive : sendmail, 18.4.10. OBJADD=
object identifier : TCP/IP Network Administration, 11.9. Simple Network Management Protocol
obscurity
  Building Internet Firewalls, 1.3.2. Security Through Obscurity
  Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
  Practical UNIX & Internet Security, 2.5.3. Final Words: Risk Management Means Common Sense
  Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased
  Practical UNIX & Internet Security, 18.2.4. Keep Your Scripts Secret!
obtaining
  BIND via FTP : sendmail, 21.1.1. Which DNS? 4.8.3 or 4.9?
  db library package : sendmail, C.2. Get the Source
  sendmail source code
    sendmail, 2.1. Get the Source
    sendmail, 18.3. Obtain the Source
octal file permissions
  Practical UNIX & Internet Security, 5.2.3. Calculating Octal File Permissions
  Practical UNIX & Internet Security, 5.2.4. Using Octal File Permissions
octal-type arguments : sendmail, 34.5. Option Argument Types
octet data
  Practical UNIX & Internet Security, 16.2.1. Internet Addresses
  TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
octet-stream application subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
Odlyzko, Andrew : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
-odq switch : sendmail, 23.6.1. Periodically with -q
Oerrs (output errors) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
OFB (output feedback) : Practical UNIX & Internet Security, 6.4.4.2. DES modes
offsite primary name servers : sendmail, 21.5.2. Offsite Servers
"ok" message : sendmail, 4.2. Verbose (-v)
old-style address lists : sendmail, 13.2.7. Accept Old-Style Lists of Addresses
OLD_NEWDB macro : sendmail, 18.8. Alphabetized Reference
OldStyleHeaders (o) option
  sendmail, 13.2.7. Accept Old-Style Lists of Addresses
  sendmail, 34.8. Alphabetized Reference
on program : Building Internet Firewalls, 2.3. Remote Terminal Access and Command
on-the-job security
  Practical UNIX & Internet Security, 13.2. On the Job
  Practical UNIX & Internet Security, 13.2.6. Departure
one : Practical UNIX & Internet Security, 9.2.1. Comparison Copies
one-command accounts : Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
one-time pad encryption
  Practical UNIX & Internet Security, 6.4.7. An Unbreakable Encryption Algorithm
  Practical UNIX & Internet Security, 8.7.3. Code Books
one-time passwords
  Building Internet Firewalls, 10.3.1. One-Time Passwords
  Practical UNIX & Internet Security, 8.7. One-Time Passwords
  Practical UNIX & Internet Security, 8.7.3. Code Books
  Practical UNIX & Internet Security, 17.4. Security Implications of Network Services
  Practical UNIX & Internet Security, 23.3. Tips on Writing Network Programs
  TCP/IP Network Administration, Preface
  TCP/IP Network Administration, 12.2.3. One-Time Passwords
One-time Passwords In Everything (OPIE) : TCP/IP Network Administration, 12.2.4. OPIE
one-way phone lines : Practical UNIX & Internet Security, 14.4.1. One-Way Phone Lines
ONEX command, in ESMTP : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions
open access, tradition of : Practical UNIX & Internet Security, 1.4.1. Expectations
open accounts
  Practical UNIX & Internet Security, 8.1.4. Open Accounts
  Practical UNIX & Internet Security, 8.1.4.6. Potential problems with rsh
  Practical UNIX & Internet Security, 8.8.7. Algorithm and Library Changes
open command
  Practical UNIX & Internet Security, 5.1.7. File Permissions in Detail
  Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
  O_CREAT and O_EXCL flags : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
open file descriptors : sendmail, 26.3.3.1. -- open file descriptors: --
open protocol suite : TCP/IP Network Administration, 3.7.1. File Sharing
Open Shortest Path First : (see OSPF protocol)
Open Software Foundation (OSF) : Practical UNIX & Internet Security, 1.3. History of UNIX
Open System Interconnection (OSI)
  Building Internet Firewalls, C.2.1. OSI Reference Model
  Practical UNIX & Internet Security, 16.4.4. OSI
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 6.1.1. Determining the Interface Name
opendir library call : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
openlog command : sendmail, 26.1.1. syslog(3)
operating systems
  Building Internet Firewalls, Platforms
  Practical UNIX & Internet Security, 1.2. What Is an Operating System?
  Practical UNIX & Internet Security, 12.3.3. Other Media
  administration : (see system administration)
  choosing : Building Internet Firewalls, 5.3.1. What Operating System?
  errors
    sendmail, 36.5.3. EX_IOERR A System I/O Error Occurred
    sendmail, 36.5.5. EX_OSERR A System Resource Error
  file failure : sendmail, 36.5.6. EX_OSFILE A Critical System File Failure
  fixing bugs in : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs
  installation of : Building Internet Firewalls, 5.8.1.1. Start with a minimal clean operating system
  keeping secret : Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity
  load : (see performance)
  multiple, and proxying : Building Internet Firewalls, 7.1. Why Proxying?
  OSTYPE declaration
    sendmail, 16.2.2. OSTYPE
    sendmail, 19.3.1. OSTYPE()
    TCP/IP Network Administration, 10.4.1.1. Building a sendmail.cf with m4 macros
    defines, listed : TCP/IP Network Administration, E.3.3. OSTYPE
    in sendmail
      TCP/IP Network Administration, E.3. m4 sendmail Macros
      TCP/IP Network Administration, E.3.3. OSTYPE
  testing reload of : Building Internet Firewalls, 13.5.6. Testing the Reload of the Operating
  UNIX : (see UNIX)
OperatorChars (o) option
  sendmail, 8.3. Rule Sets
  sendmail, 31.10. Alphabetized Reference
  sendmail, 34.8. Alphabetized Reference
operators, token separation : (see OperatorChars (o) option)
opiekey software : TCP/IP Network Administration, 12.2.4. OPIE
opiepassword : TCP/IP Network Administration, 12.2.4. OPIE
${opmode} macro : sendmail, 31.10. Alphabetized Reference
optic cables : (see cables, network)
optical vampire taps : Practical UNIX & Internet Security, 12.3.1.5. Fiber optic cable
option set, invoking dialup IP (dip) : TCP/IP Network Administration, A.1. Dial-Up IP
optional database files : sendmail, 33.3.4.8. -o the database file is optional (V8.1 and above)
Options command : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
options entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
option field, in DHCP : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
options file
  TCP/IP Network Administration, 6.3.1. The PPP Daemon
  TCP/IP Network Administration, 6.3.2. Dial-Up PPP
options statement : TCP/IP Network Administration, 5.3.1.1. Options
  in gated : TCP/IP Network Administration, B.5. Options Statements
  INET
    TCP/IP Network Administration, 5.3.1.1. Options
    TCP/IP Network Administration, A.2. The PPP Daemon
options, sendmail
  sendmail, 3.1. Role in the Filesystem
  sendmail, 4. How to Run sendmail
  sendmail, 5.3.7. Options
  sendmail, 13. Setting Options
  sendmail, 19.4.1. Options
  sendmail, 34. Options
  (see also switches, command-line)
  m4 and : sendmail, 34.3. Configuring with V8 m4 Options
  multicharacter
    sendmail, 34.1.2. V8.7 Multicharacter Options in the Command Line
    sendmail, 36.7. Alphabetized Reference
  required : sendmail, 13.2. Required Options
  safe : sendmail, 34.1.4. Options that Are Safe
  security : sendmail, 22.8.3. Security Options
  single-character : sendmail, 36.7. Alphabetized Reference
  testing : sendmail, 13.3. Testing the Options
options.device file : TCP/IP Network Administration, A.2. The PPP Daemon
Orange Book : Practical UNIX & Internet Security, 2.3.3. Adding Up the Numbers
ORCPT address : sendmail, 23.9. The qf File Internals
org domain : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
origin date, message : (see $a macro)
originate mode : Practical UNIX & Internet Security, 14.3.1. Originate and Answer
originate testing : Practical UNIX & Internet Security, 14.5.3.1. Originate testing
orphaned locks : sendmail, 23.2.3.3. Locks can get stuck
OSF (Open Software Foundation) : Practical UNIX & Internet Security, 1.3. History of UNIX
OSF/1 operating system : Practical UNIX & Internet Security, 1.3. History of UNIX
OSI (Open System Interconnection)
  Building Internet Firewalls, C.2.1. OSI Reference Model
  Practical UNIX & Internet Security, 16.4.4. OSI
  TCP/IP Network Administration, 1.2. A Data Communications Model
  TCP/IP Network Administration, 6.1.1. Determining the Interface Name
OSPF protocol
  TCP/IP Network Administration, Preface
  TCP/IP Network Administration, 1.7. Application Layer
  TCP/IP Network Administration, 7.4.3. Open Shortest Path First
  authenticating packets : TCP/IP Network Administration, B.8.1. The ospf Statement
  enabling (in gated)
    TCP/IP Network Administration, 7.7.1.2. Interior gateway configurations
    TCP/IP Network Administration, 7.7.1.3. Exterior gateway configuration
    TCP/IP Network Administration, B.8.1. The ospf Statement
ospf statement (in gated) : TCP/IP Network Administration, B.8.1. The ospf Statement
ospfase protocol : TCP/IP Network Administration, 7.7.1.3. Exterior gateway configuration
OSTYPE command (m4)
  sendmail, 16.2.2. OSTYPE
  sendmail, 19.3.1. OSTYPE()
  TCP/IP Network Administration, 10.4.1.1. Building a sendmail.cf with m4 macros
  defines, listed : TCP/IP Network Administration, E.3.3. OSTYPE
  in sendmail
    TCP/IP Network Administration, E.3. m4 sendmail Macros
    TCP/IP Network Administration, E.3.3. OSTYPE
out-of-date files, defined : TCP/IP Network Administration, 9.6.1. rdist
outgoing (outbound)
  calls : Practical UNIX & Internet Security, 14.5. Modems and UNIX
  finger requests : Building Internet Firewalls, 8.8.1. finger
  mail, logging : Practical UNIX & Internet Security, 10.4.2. Mail
  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, 6.7.1. Outbound Telnet Service
Outcome table (NIS+) : Practical UNIX & Internet Security, 19.5.3. NIS+ Tables
outdated software : (see software)
output
  debugging : sendmail, 37.3. Interpreting the Output
  errors (Oerrs) : TCP/IP Network Administration, 11.4.3. Checking the Interface with netstat
  feedback (OFB) : Practical UNIX & Internet Security, 6.4.4.2. DES modes
  rule testing : sendmail, 38.6.4. The Output
  syslog : sendmail, 26.1.3. syslog's Output
outsiders : Practical UNIX & Internet Security, 13.3. Outsiders
overload attacks
  Practical UNIX & Internet Security, 25.2. Overload Attacks
  Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial
overruns : (see buffers, overruns)
overtime : Practical UNIX & Internet Security, 13.2.3. Performance Reviews and Monitoring
overwhelming the server : TCP/IP Network Administration, 9.4. A BOOTP Server
overwriting
  files : sendmail, 33.2.1.4. -o append to, don't overwrite the file
  media : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal
  rule sets : sendmail, 8.4. Rules
OW- (sendmail.cf) : Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
owner, mailing list : sendmail, 25.3. Defining a Mailing List Owner
owner-admin alias : TCP/IP Network Administration, 10.3. sendmail Aliases
owners of information : Practical UNIX & Internet Security, 2.4.4.1. Assign an owner
owners, changing : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner
ownership : (see permissions)
ownership notices : Practical UNIX & Internet Security, 26.2.6. Other Tips

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