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

Wed Oct 9 17:12:12 UTC 2002

On Wednesday, Oct 9, 2002, at 11:36 Canada/Eastern, Stephen J. Wilcox 
wrote:

> On Tue, 8 Oct 2002, Greg A. Woods wrote:
>
>> Such things REALLY _NEEED_ to be broken, and the sooner the better as
>> then perhaps the offenders will fix such things sooner too, because 
>> they
>> are by definition already broken and in violation of RFC 1918 and good
>> common sense.
>
> 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.

Joe