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Multi-Homed Server

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7 replies

by stromn

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I have server set up as a router between 2 networks. It has 2 NICs each configured with its own IP address which are the gateways for each network. I am using NT 4.0 with sp5. On this server I have RIP running and have enabled IP Routing. From theserver I can see and ping all computers on both networks. When I try to ping computers on the remote network from any computer on the first network, I can only ping a few in the subnet. The network address of the remote network is 206.197.108.0 with a subnet of 255.255.255.0. The gateway is 206.197.108.152. I have checked the routing tables on the server and on all PCs. Everything is routing correctly. I know this is true, because I can ping both the local and remote gateways and part of the remote network.

Why can I reach the entire remote network from the multi-homed computer but not from any other computers?

Please help.

7 replies

by mikel~t

The multi-homed computer is the physical connection between the two networks. When you type ping, the card with the correct network destination is doing the job. That is why you can easily see both.

The other issue with not being able to ping across the multi-homed computer is probably due to an improper setup of the network cards. Make sure that TCP/IP is at the top of the binding order on your server, as well as your workstations. I'd even go so far as to use DNS on the multi-homed server if you aren't already.

Other than that, you should be able to see both networks from either side of the server with the two NICs if the setup for the RIP and ip forwarding is correct.

hope this sheds some light for you.

Mike

by stromn

Have done all that, still can only ping part of remote network. Thanks for your input

by mckaytech

The only thing I can think of that would impact some computers and not others would be something like a subnet mask error on some of the workstations.

If you're pinging by IP address, it has to be a routing or connectivity issue so DNS or WINS wouldn't be a factor.

paul

by stromn

I also thought the subnet was the culprit, but I have checked it at all points and cannot find the problem. I can ping both networks and all PCs on remote network from server/router. And I can ping remote network and some remote PCs from my network PCs. I don't understand why I can see only part of remote network from my PC when the server can see all of it.

Thanks anyway...

by jaystar

The key here is that you setup gateways for each network card. From what I rember, in a multi-homed system you must only have one network card have the gateway. if you set both you can get multiple default routes in your routing table... a very badthing.

Take out one of the gateway ip's and reboot.
let me know if it fixes it...

Good Luck

Jay

by stromn

I tried removing gateway from remote network NIC, but still the same results. However, I called the administrator for the remote network and asked him to check the gateways on his workstations and guess what - that's where the problem was. Once he entered the gateway on his PCs everything was visible on my end.

Thanks..

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