multi-homed network?

[latrosicarius]

Hello everyone. Can someone tell me the basics about how to set up a multi-homed network?

I would like a PC to connect to two gateways at the same time, for the sake of argument say the gateways are:

192.168.0.1
XX.88.213.1

The PC has two network adapters, if that makes a difference. A switch is between the PC and the gateways.

Thank you

P.S. this is so i can connect to my LAN on one gateway, and also connect directly to a different ISP on the other gateway.

[Moby-Dick]

you can only have 1 default gateway.

you'll need to use the route add command to route to the LAN via the other gateway

[3xH]

Are you able to give a little more detail in why you need to do this? I assume that 2nd IP address is a Public one that will not be NAT'd?

[b0redom]

Basically your PC will send all traffic to the default gateway unless there's an exception.
You can only have one default gateway.

If you want to add exceptions you need the route add command. If you give it the -P flag it will make it persistant across reboots (in Windows).

If you give us more information we can provide more advice.

[latrosicarius]

ok thanks for the replies. Here is some more information I will try to provide.

I have 2 ISPs from different companies.

I have several PCs and a server. They are ALL connected to a switch. This diagram might help:


For one ISP I have a static IP address, so I can connet to it by entering the IP address, gateway, and DNS servers they provided me into TCP/IP properties of the server's network adapter.

For the other ISP, I have a dynamic IP, so I use a router to connect to it. Several PCs use that router.

So I want to let my server get in on the LAN. Right now it cannot access the LAN because obviously its IP is out of scope (the LAN is all 192.168.0.X, and the server's IP is external).

[Jiff Lemon]

Add a second IP address to your server's NIC that is in the 192.168.0.0 range. However, you want it NOT to be an IP that can be allocated by your DHCP server.

You'll then need something to resolve the external name to the new internal IP (if you're not running an internal DNS server you can just do it by editing the hosts file)

[latrosicarius]

Hey Jiff, I understand your first line 100%

... but your second line about the host file? Can you explain a bit more?

Edit.... Nevermind, all I had to do was do what you said in the first line. It's working! Thanks