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Re: new draft on IPv6 CPE router available for review
On Tue, 1 Jul 2008, Ole Troan wrote:
if an implementation handles unnumbered links (links without global
addresses) or loopback interfaces then it has to implement the
semi-strong or weak host model. are there router implementation which
implements the strong host model?
Most routers will use outgoing interface IP address for creating IP
packets, unless it's been specified that this service should originate
from another interface. To use cisco example:
With the following configuration line:
ip telnet source-interface Loopback0
all telnet session initiated from the router CLI will have source IP of
"loopback 0" interface. If this line is not present, the router defaults
to using the outgoing interface (routingwise) IP address as source IP for
the telnet TCP session.
It's standard industry practice to use loopback addresses for almost
everything control plane in routers, as then the IGP will handle reroutes
and established TCP sessions are not affected by interfaces going up or
down.
--
Mikael Abrahamsson email: swmike@swm.pp.se