source addr. for icmp if link-local-only on interface

Hi group,

On a router, if I have on a WAN link just the ipv6 link local address
('cause this is enough for routing) and I execute a v6ping to a global
scoped address somewhere in this WAN, my router chooses a global
scoped address, borrowed from another interface of my router. That's
at least what I've tested.
How is this "borrowed" address chosen and where is this specified? I
could not find an rfc describing exactly this. I guess this is vendor
specific, if so, is there a documentation from Cisco explaining this?

regards

Roger #23543

Blogs and organic groups at http://www.ccie.net
Received on Fri Sep 02 2011 - 10:58:48 ART