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public  - eth0
private - eth1
dmz     - eth2

iptables -A OUTPUT -s -i eth2 -d -i eth1 -j DENY
iptables -A OUTPUT -s -i eth2 -d -i eth0 -j ACCEPT
iptables -A OUTPUT -s -i eth0 -d -i eth2 -j ACCEPT

Just my $0.02.

Jonathan Glass

> I just added a 3rd nic to my linux firewall.  On that nic I hav it
> directly connected via cross-over to a server that is running an
> application.  I did this because my customers will be using that
> application from the Internet.  If for some reason someone was to gain
> access to that box I do not want them to be able to come back to the
> firewall and jump over to the 2nd nic to my company network.
>
> What would be a good rule that would allow all incoming traffic from
> the outside and 2nd nic to that box but would disallow any traffic
> originating from that machine?
>
> _______________________________________________
> Ale mailing list
> Ale at ale.org
&gt; <a  rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale";>http://www.ale.org/mailman/listinfo/ale</a>
&gt;


-- 
Jonathan Glass
Systems Support Specialist II
IBB/GTEC
Office: 404-385-0127
Cell: 404-444-4086


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