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Index: O

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

octets

DNS & BIND, 2.6.4. Mapping Addresses to Names
DNS & BIND, A.1. Master File Format
compressing domain names : DNS & BIND, 14.2.3. Domain Name Compression
data transmission order : DNS & BIND, A.3.3. Data Transmission Order
resource record data and : DNS & BIND, A.4.1.1. Domain name
subnetting on/off octet boundaries : DNS & BIND, 9.5.1. Subnetting on an Octet Boundary

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

off-site name server : DNS & BIND, 8.1. How Many Name Servers?

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-answer format : DNS & BIND, 10.4.1.4. More efficient zone transfers

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 files limit

DNS & BIND, 7.6.1. Common Syslog Messages
DNS & BIND, 10.4.2.4. Changing the open files limit
DNS & BIND, 13.5.3. Name Server Reports Too Many Open Files

open protocol suite : TCP/IP Network Administration, 3.7.1. File Sharing

Open Server : DNS & BIND, 6.4.7. SCO's Open Server 5.0

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 field, in DHCP : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

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 directive

DNS & BIND, 6.1.6. The options Directive

DNS & BIND, 14.2.5. The _res Structure

DNS & BIND, F.1.10. options (4.9.3)

DNS & BIND, F.1.19. options (8.X.X)

options allow-query : DNS & BIND, 10.11.2. Restricting Queries

options auth-nxdomain : DNS & BIND, 13.5.7. Other Name Servers Don't Cache Your Negative Answers

options cleaning-interval : DNS & BIND, 10.4.3.1. Cleaning interval

options coresize : DNS & BIND, 10.4.2.3. Changing the core size limit

options debug

DNS & BIND, 6.1.6. The options Directive
DNS & BIND, F.2.7. options debug (4.9.3 and later versions)

options fake-iquery : DNS & BIND, F.1.10.5. options fake-iquery

options fetch-glue

DNS & BIND, 10.9. A Nonrecursive Name Server
DNS & BIND, 10.11.5. Delegated Name Server Configuration

options files : DNS & BIND, 10.4.2.4. Changing the open files limit

options forward-only

DNS & BIND, 10.8. A More Restricted Name Server
DNS & BIND, F.1.10.1. options forward-only

options forwarders : DNS & BIND, 10.7. Building Up a Large Site-wide Cache with Forwarders

options interface-interval : DNS & BIND, 10.4.3.2. Interface interval

options listen-on : DNS & BIND, 10.11.7. Two Name Servers in One

options ndots

DNS & BIND, 6.1.6. The options Directive
DNS & BIND, F.2.6. options ndots (4.9.3 and later versions)

options no-fetch-glue

DNS & BIND, 10.9. A Nonrecursive Name Server
DNS & BIND, 10.11.5. Delegated Name Server Configuration
DNS & BIND, F.1.10.3. options no-fetch-glue

options no-recursion

DNS & BIND, 10.9. A Nonrecursive Name Server
DNS & BIND, 10.11.5. Delegated Name Server Configuration
DNS & BIND, F.1.10.2. options no-recursion

options pid-file : DNS & BIND, 10.11.4. Running BIND as a Non-Root User

options query-log

DNS & BIND, 7.6.1. Common Syslog Messages
DNS & BIND, 13.2.3. Logging Queries
DNS & BIND, F.1.10.4. options query-log

options recursion

DNS & BIND, 10.9. A Nonrecursive Name Server
DNS & BIND, 10.11.5. Delegated Name Server Configuration

options statistics-interval : DNS & BIND, 10.4.3.3. Statistics interval

options transfer-format : DNS & BIND, 10.4.1.4. More efficient zone transfers

options entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File

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

order keyword : DNS & BIND, 6.4.8. Linux

order, data transmission : DNS & BIND, A.3.3. Data Transmission Order

org domain

DNS & BIND, 2.2.1. Top-Level Domains
TCP/IP Network Administration, 3.3.1. The Domain Hierarchy

organizing db files : DNS & BIND, 7.3. Organizing Your Files

origin date, message : (see $a macro)

$ORIGIN entries (db files)

DNS & BIND, 7.3.2. Changing the Origin in a Database File
DNS & BIND, A.1. Master File Format

origin, db file

DNS & BIND, 4.4.1. Appending Domains
DNS & BIND, 7.3.2. Changing the Origin in a Database File

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

os data category (logging) : DNS & BIND, 7.5.3. Category Details

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

out-of-zone resource records : DNS & BIND, 13.4.2. Name Server Behavior

outages : DNS & BIND, 8.5.1. Outages

Outcome table (NIS+) : Practical UNIX & Internet Security, 19.5.3. NIS+ Tables

outdated software : (see software)

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

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

output, debugging : (see debugging)

"outside zone" message : DNS & BIND, 7.6.1. Common Syslog Messages

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

overworked name server : DNS & BIND, 8.1.2. Capacity Planning

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 name is invalid" message : DNS & BIND, 7.6.1. Common Syslog Messages

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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