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GL-25
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Glossary
O
Oakley
A protocol for establishing secret keys for use by authenticated parties, based on
Diffie-Hellman and designed to be a compatible component of ISAKMP.
OFB
output feedback. An IPSec function that feeds encrypted output (generally, but
not necessarily, DES-encrypted) back into the original input. Plaintext is
encrypted directly with the symmetric key. This produces a pseudo-random
number stream.
outside global
The IP address assigned to a host on the outside network by the host's owner. The
address was allocated from globally routable address or network space.
outside local
The IP address of an outside host as it appears to the inside network. Not
necessarily a legitimate address, it was allocated from an address space routable
on the inside.
OSPF
Open Shortest Path First. Link-state, hierarchical IGP routing algorithm
proposed as a successor to RIP in the Internet community. OSPF features include
least-cost routing, multipath routing, and load balancing.
P
P2P
See peer-to-peer.
PAD
packet assembler/disassembler. Device used to connect simple devices (like
character-mode terminals) that do not support the full functionality of a
particular protocol to a network. PADs buffer data and assemble and disassemble
packets sent to such end devices.
padding
In cryptosystems, padding refers to random characters, blanks, zeros, and nulls
added to the beginning and ending of messages, to conceal their actual length or
to satisfy the data block size requirements of some ciphers. Padding also
obscures the location at which cryptographic coding actually starts.
PAM
Port to Application Mapping. PAM allows you to customize TCP or UDP port
numbers for network services or applications. PAM uses this information to
support network environments that run services using ports that are different
from the registered or well-known ports associated with an application.