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Public Firewall
Posted on 2011-03-05
We recently implemented Paralells, plesk. You cannot NAT Plesk containers. All containers are public IP's. The class C public IPs sit on the colo's router and then this plugs into my switch using a cat5 cable the colo facility provides. The servers are plugged into the switch too, all having public IP's. I can certainly put a firewall in place and change the gateway on the NIC's on the servers and have the outbound traffic pass thourgh the firewall. The QUESTION is about inbound traffic, how can you have the firewall filter inbound traffic, when it is all public IP broadcast traffic?
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You would need to implement a firewall that works in bridge mode and not as filtering router. In bridge mode they are "transparent" at layer 3 so there is no IP routing or NAT'ing avalaible, but you can still filter traffic.
I have not read it in detail, but I did find how to implment a bridging firewall in Linux using netables.
http://www.spenneberg.com/talks/linux-kongress2002/ralf-spenneberg.bridgewall.pdf
I'm not sure what commercial firewalls will work in bridge mode. I know PIX (now ASA) from Cisco does and I am sure some of the other big names (like Juniper and Checkpoint) do also.
I have not read it in detail, but I did find how to implment a bridging firewall in Linux using netables.
http://www.spenneberg.com/talks/linux-kongress2002/ralf-spenneberg.bridgewall.pdf
I'm not sure what commercial firewalls will work in bridge mode. I know PIX (now ASA) from Cisco does and I am sure some of the other big names (like Juniper and Checkpoint) do also.
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