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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