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Index: 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 address
• ONBOOT (Linux configuration value): Assigning an Address
• one-time passwords: One-Time Passwords
• • OPIE: OPIE
• 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 (see OSPF)
• open standards protocol development: Protocol Standards
• Open Systems Interconnect Reference 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 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
• • BSD Unix kernel configuration: The options statement
  • named.conf file: The 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): Data Communications Model
• • Application Layer: Data Communications Model
  • Data Link Layer: Data Communications Model
  • layers: Data Communications Model
  • Network Layer: Data Communications Model
  • Physical Layer: Data Communications Model
  • Presentation Layer: Data Communications Model
  • Session Layer: Data Communications Model
  • Transport Layer: Data Communications Model
• OSPF (Open Shortest Path First): Application Layer
• • 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
• • 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

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