index_O

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O command (sendmail) 
octet data, MIME encoding 
octet-stream (MIME data subtype) 
Oerrs field (netstat command) 
official Internet addresses, assessing need for 
ONBOOT (Linux configuration value) 
one-time passwords 
    OPIE 
ONEX command (ESMTP) 
only_from parameter (xinetd) 
OPEN messages (BGP) 
Open Shortest Path First  [See OSPF]
open standards protocol development 
Open Systems Interconnect Reference Model  [See OSI]
OpenSSL (Apache) 
OPIE (One-time Passwords in Everything) 
Opkts field (netstat command) 
option statement (dhcpd) 
Options directive (Apache) 
options entry (resolv.conf file) 
Options field (DHCP) 
options parameter (gated) 
options statement
    BSD Unix kernel configuration 
    named.conf file 
OPTIONS variable (sendmail) 
Order directive (Directory containers) 
order_spec option (named) 
org domain 
organizational domains (DNS) 
organizational types 
OSI (Open Systems Interconnect Reference Model) 
    Application Layer 
    Data Link Layer 
    layers 
    Network Layer 
    Physical Layer 
    Presentation Layer 
    Session Layer 
    Transport Layer 
OSPF (Open Shortest Path First) 
    designated routers 
    directional graphs 
    equal-cost multi-path routing 
    Hello packets 
    hierarchy of routing areas 
    link-state database 
    LSA (Link-State Advertisement) 
    overview 
    security 
ospf statement (gated) 
OSTYPE macro (sendmail)  2nd  3rd 
other parameter (gated) 
outdelay parameter (gated) 
overload-bit parameter (gated) 
overriding sender addresses (sendmail)