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Routing issues

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by julia_goins

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I am trying to set up a remote office to communicate with our main office. The connection between the two offices are handled via ISDN Lan Modems. I have a multihomed BDC (NT 4.0) that I have enabled IP Forwarding and installed the RIP service on. The member server at the remote location is W2K. The two modems communicate with each other, and I can ping one nic in the BDC, but I can't seem to get past that point. Any suggestions will be appreciated.

11 replies

by curlergirl

Are you using TCP/IP? If so, what device is doing the IP routing between your two offices? How are your servers configured at each end - where is the BDC you mentioned and where is the PDC? Are both offices in the same domain? If you will provide more information, such as your IP addressing scheme at each office, the IP addresses of the NICs at each end, and what method you are using for NetBIOS name resolution (i.e., WINS, HOSTS, etc.), someone here might be able to help you. As it is, there is really too little information about your setup to answer your question. Sorry I couldn't be more help.

by curlergirl

Hmmm - is everyone at your satellite office on the 192.168.1.x subnet? Assuming the answer is "yes", then you need a method of routing between your two networks - 192.168.1.0 and 10.10.6.0. You could either add a second NIC card to your server on the satellite end and give it an IP in the 10.10.6.0 subnet, change your modem IP to also be in the same subnet and away you go. Alternatively, you could use static IP routing by adding an entry to your routing table on the satellite end to send packets for 10.10.6.x through the modem IP address as the gateway. You are also going to have a problem with NetBIOS name resolution. You'll need to give your satellite office workstations a HOSTS file so that they can find the server(s) on the main office end. Hope this helps!

by curlergirl

Oops! Sorry for extraneous comments on name resolution - I reread your post and see that you have this solved.

by dheupel

synergy is right about not enough info on your configuration, although since you state you cannot ping the second NIC in the BDC, we already know it's probably not a name resolution problem.

However, I can offer a suggestion:

Make sure that the second NIC (the one you can't ping) in your multihomed BDC is on the same subnet as the NIC you can ping across the ISDN link. If this is impractical due to the number of hosts at the sites, then you should put a router in at each site instead.

by julia_goins

Yes, TCP/IP...this is an ISDN modem to modem connection from remote site to lan.

Modem on lan side is connected to a switch with a cross over cable...10.10.6.130/255.255.240.0

multihomed bdc -
nic1 10.10.6.7/255.255.254.0 - gateway 10.10.6.1(T1 connection - Cisco Router)
nic2 10.10.6.135/255.255.240.0 - gateway is 10.10.6.130 (ISDN modem)

remote site modem 192.168.1.1/255.255.255.224 with dhcp server enabled.

either wins or wins proxy will be installed on the member server to enable browsing of the network...will also add hosts and lmhosts files to the remote site.

i have to be able to actually connect to the network first.

i have enabled ip forwarding on both cards on the bdc and installed the rip service...i did download rras for 4.0, but haven't installed yet...not convinced it could help me in this sitation.

by julia_goins

Just one more note...my first choice would be to add a WIC to the Cisco router - but for many long, involved political reasons I can't do this...

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