On Thu, Jan 31, 2002 at 12:46:59PM -0800, Cory Petkovsek wrote:
> 
> Most likely, your IP stack will be looking for the response on the dsl
> line, since that is where it left.  So in effect your firewall will be
> pinging google, google will be responding to the left ear(nic), but your
> firewall will be listening to its right ear, meanwhile wondering what
> this junk data is on it's left ear. 

Wouldn't that completely break this rule?

> iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

How would netfilter know that packets coming in on eth1 are related to
what was sent out on eth0?  Wouldn't you also need some kind of
state translation/creation, or no filtering whatsoever on eth1?

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