** Reply to message from Brian <[EMAIL PROTECTED]> on Wed, 10 Apr 2002 18:52:43 -0700


> I have a iptables firewall version 1.2.5, I LOVE IPTABLES SO MUCH MORE
> THINGS YOU CAN DO. I have a small network off my eth0 interface
> 192.168.0.X network and my ppp0 is my DSL connection, with the current
> firewall how would I block someone going to the Internet from my eth0
> interface. I have tried many of things here and had no luck.
> 
> Both my INPUT and OUTPUT used a DROP policy by default and I am using
> NAT to route my traffic to the Internet. <snip>

The best way to prevent somebody exiting your network is to use the mac match module 
since the mac address will be intact since it hasn't hit a router yet.

/sbin/iptables -A OUTPUT -o eth0  -m -mac --mac-source XX.XX.XX.XX.XX.XX -j DROP

Of course, you will have to know the mac address of your violator's ethernet card.

jb

-- 
Jack Bowling
mailto: [EMAIL PROTECTED]



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