(Loose) uRPF vs. non-announced IXP space

[Phil Mayers]

On 08/02/12 12:35, Stefan Neufeind wrote:

> but why don't those routers source the ICMP-message from a
> loopback-address or the like with an "official IP"?

Section 2.2 of RFC 4443 suggests (to me) the default for source address 
of ICMPv6 messages should be the address of the outgoing interface 
towards the destination.

Of course it's a SHOULD, so it's reasonable for an override option:

ipv6 icmp source-address LoopbackX

...to exist. But not to be the default.