O

O command (sendmail), Setting Options
octet data, MIME encoding, Multipurpose Internet Mail Extensions
octet-stream (MIME data subtype), Multipurpose Internet Mail Extensions
Oerrs field (netstat command), The Interface Name
official Internet addresses, assessing need for, Obtaining an official network addressObtaining an official network address
ONBOOT (Linux configuration value), Assigning an Address
one-time passwords, One-Time Passwords, OPIEOPIE
OPIE, OPIEOPIE
ONEX command (ESMTP), Multipurpose Internet Mail Extensions
only_from parameter (xinetd), Controlling Access with xinetd
OPEN messages (BGP), Border Gateway Protocol
Open Shortest Path First, Application Layer (see OSPF)
open standards protocol development, Protocol Standards
Open Systems Interconnect Reference Model, A Data Communications Model (see OSI)
OpenSSL (Apache), Using Encryption
OPIE (One-time Passwords in Everything), OPIE
Opkts field (netstat command), The Interface Name
option statement (dhcpd), DHCP Options
Options directive (Apache), Controlling Server OptionsControlling Server Options
options entry (resolv.conf file), The Resolver Configuration File
Options field (DHCP), Dynamic Host Configuration Protocol
options parameter (gated), The kernel Statement
options statement, The options statement, The options StatementThe options Statement
BSD Unix kernel configuration, The options statement
named.conf file, The options StatementThe options Statement
OPTIONS variable (sendmail), Running sendmail as a Daemon
Order directive (Directory containers), Defining Access Controls
order_spec option (named), The options Statement
org domain, The Domain Hierarchy
organizational domains (DNS), The Domain Hierarchy
organizational types, Obtaining an official network address
OSI (Open Systems Interconnect Reference Model), A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model, A Data Communications Model
Application Layer, A Data Communications Model
Data Link Layer, A Data Communications Model
layers, A Data Communications Model
Network Layer, A Data Communications Model
Physical Layer, A Data Communications Model
Presentation Layer, A Data Communications Model
Session Layer, A Data Communications Model
Transport Layer, A Data Communications Model
OSPF (Open Shortest Path First), Application Layer, Interior Routing Protocols, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First, Open Shortest Path First
designated routers, Open Shortest Path First
directional graphs, Open Shortest Path First
equal-cost multi-path routing, Open Shortest Path First
Hello packets, Open Shortest Path First
hierarchy of routing areas, Open Shortest Path First
link-state database, Open Shortest Path First
LSA (Link-State Advertisement), Open Shortest Path First
overview, Interior Routing Protocols
security, Open Shortest Path First
ospf statement (gated), The ospf Statement
OSTYPE macro (sendmail), Building a sendmail.cf with m4 macros, m4 sendmail Macros, OSTYPE
other parameter (gated), The kernel Statement
outdelay parameter (gated), The bgp Statement
overload-bit parameter (gated), The isis Statement
overriding sender addresses (sendmail), The sendmail Command