Re: Supply-side spoofing prevention

[btk @ matrix . cray . com (Bryan Koch)]

> Excellent point.  We're all concerned with INbound spoofing (because
> they harm US and represent a threat to US), but how many of us filter 
> OUTbound spoofing?
> 
> Probably damned few of us.  
> 
> I mean, who'd want to go to the extra trouble to complicate our access lists 
> with entries that do nothing to protect us and just slow down our routers?

We have always filtered outbound packets to ensure that they originate
on our assigned networks.

Bryan Koch
Cray Research