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Multi-homed vs. one NIC with 2 ip addresses

Multi-homed vs. one NIC with 2 ip addresses

Multi-homed vs. one NIC with 2 ip addresses

(OP)
Hi all,

I am setting up a proxy/firewall server on NT4, and I am wondering what the differences/disadvantages (other than performance) there are to using one NIC with two ip address (different subnets) assigned vs. two NIC with ip routing disabled. You hear/read a lot about multi-homed NT but I can't find anything reguarding security on the multi ip address setup. Functionaly, both work fine.

The server will only be used for proxy/firewall and nothing else. The the NT server will be visible from the internet. Preformance is of some concern but not an issue. I am mainly concern with security.

Any thoughts??

Thanks in advance!
bill

RE: Multi-homed vs. one NIC with 2 ip addresses

Some thoughts, yes!

If you have a single NIC it has to be used to connect to your router. Now how are you going to connect the server to the network?

ALWAYS use (at least) two NICs for doing this sort of thing. One (and it can be a slow one) goes to your router with a live internet IP address, the other one is used with your internal private IP address range. Enable IP forwarding and only use TCPIP if you can.

If you are mainly concerned with security I would suggest not using Proxy server!!!

RE: Multi-homed vs. one NIC with 2 ip addresses

Amen to Zelabdakh's post! If you are to have ANY security there have to be separate NICs. For some solid security on an NT box, I have used a firewall from Elron than runs on an NT workstation with dual or triple NICS. The licensing is a bit pricey, but it is a very solid product.

Fred Wagner
frwagne@ci.long-beach.ca.us

RE: Multi-homed vs. one NIC with 2 ip addresses

Got to add my aggrement

THe added security of a route up to another cardd is the bare minimum you need.

Foolish to do otherwise

Paul O'Connor
damhna@hotmail.com

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