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2 ethernet interfaces in redhat

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csross's Avatar
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Join Date: Sep 2004
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26-Jun-2006, 12:30 PM #1
2 ethernet interfaces in redhat
I have a number of new servers, most of which will be on a private network. The servers will have 2 ethernet cards. 2 of the servers will have an address on a public network and one on a private. The other servers with be in one private network. I want those developers to use the server on the public network to get to the servers on the private network remotely. The servers will be attached to a cisco switch that is already configured with the 3 vlans and doesn't participate in vtp.

How do I set up the the server with the 2 cards to have 2 addresses? Is there anything I have to do to configure the server to allow the user to come in on the public address and ssh over to other servers on the private network?

Thanks for any input.
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01-Jul-2006, 02:05 AM #2
By public do you mean "Internet"?

If I were you, I would make a firewall. Or create another Linux box and run Iptables on it. Put three NIC's in it. "Outside", "Inside-1", "Inside-2". Connect each interface to each respective VLAN on your switch.

Outside is Internet, Inside-1 is Segment A, Inside-2 is Segment B. Your Linux FW does all of the routing, all the other servers can be firewall'd, ACL'd by this system.

Either allow your developers to SSH into this box, or create NAT's to respective systems and allow SSH to it from their source.

I normally don't reccomend multiple NIC's in systems. If you can at all stay away from it, do so. Let router's do that for you.
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