January 2004
Intermediate to advanced
536 pages
13h 2m
English
Content preview from IPv6, 2nd Edition
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68 Part One • Theory
4.3.3 IP OPTIONS
The IPv4 header includes a variable-length options field. IP options were
meant to be the way to handle certain special functions. The original speci-
fications left these options undefined, but eventually options for things like
security as well as certain routing functions were added. Routing options
include one (record route) to have each router handling the packet to record
its address and another (timestamp) to have each router record its own
address as well as the time it handles the packet. Source routing options
are also available: Loose source routing specifies a list of routers that the
packet must pass through ...
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