To ebtables ot Iptables?

Thanks for your replies

 I was thinking more about the security of a file server rather than 
adding a layer of security to the network. I was looking at ebtables to 
try to assess whether or it could be utilised with IPS to help secure a 
LAN/intranet  file server.

I was looking at the configuring a bridge section of this website. 
<http://www.linuxsecure.de/index.php?action=90#whatis_ips>In this 
example I understand that they are trying to filter between two ethernet 
cards. If a third was fitted, could it be made to operate similarly to a 
DMZ? The DMZ being the machines on the private address space.

Thanks in advance

Chris


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