Risks of patched servers behind de-randomizing NAT

[Evan Hunt]

> Can we get a reading from Those Who Know about how likely it is that 
> BadGuys can trick a client inside such a firewall to facilitate an attack 
> against an internal recursive server (said server can query through the
> firewall).

Hey, all you guys inside the firewall--you should totally click on this
hilarious URL!  http://www.evilwebpage.tld

It's pretty much that easy.  Someone clicks, queries go out, answers
come back--and some of the answers are going to be poisoned.

A NAT router that obscures unpredictable source ports and reassigns
them to predictable ones is eliminating the best defense we have.

-- 
Evan Hunt -- evan_hunt at isc.org
Internet Systems Consortium, Inc.