icmp rpf

Tony Rall trall at almaden.ibm.com
Tue Sep 26 07:17:27 UTC 2006

On Monday, 2006-09-25 at 10:09 MST, Mark Kent <mark at noc.mainstreet.net> 
> Mark Smith replied with two paragraphs, but it's not 100% clear to me
> that he got the reason why I asked.   I asked because his initial 
> boiled down to "numbering on un-announced space breaks PMTUD"...
> but it doesn't, not by itself (which he later expanded).
> It only does so in the presence of filtering.

Which is exactly what one might expect to happen.  At least it seems to me 
that RFC 3704 (BCP 84, http://www.ietf.org/rfc/rfc3704.txt) applies.

When your traffic is sourced with dubious addresses, you should expect 
much of it to disappear.  And when this happens, you're hurting your 
customers and your customers' customers (okay, sometimes it's "just" your 
peer's customers - still a concern in my opinion).

Tony Rall

More information about the NANOG mailing list