Re: Who does source address validation? (was Re: what's that smell?)

[David Schwartz <davids () webmaster com>]

> > Ok but real world calling. I have tried this and when customers find
> > something
> > doesnt work on your network but it does on your competitor you make it
> > work even
> > if that means breaking rules.
>
> What services require transport of packets with RFC1918 source
> addresses across the public network?
>
> I can think of esoteric examples of things it would be possible to do,
> but nothing that a real-world user might need (or have occasion to
> complain about).
>
> Do you have experience of such breakage from your own customers? It
> would be interesting to hear details.

        Loss of ICMP packets generated by links with endpoints numbered in RFC1918
space. Holes in traceroutes, broken PMTU detection.

        DS