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NT User Logon across 2 Subnets

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by matthewballou

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I have a routable subnet behind a Cisco 2620, (mask 255.255.255.0) this subnet contains the PDC/BDC/WINS/Exchange 5.5 and about 40 nodes. I also have another Cisco 2611 which has a routable external interface and an internal interface peforming NAT with a subnet 192.168.1.0 255.255.252.0 where most of the "normal" low overhead users reside. This subnet has no BDC or Domain but does have a WINS server. All the users are connected via HP Procurve 4000 switches which are (unfortunately) daisy chained. The only way it seems users can logon to the Domain (PDC) is with NETBEUI loaded on each client. I tried to configure the Cisco 2611 to pass UDP traffic, but it does not seem to help.

4 replies

by auman

Because your routers are breaking up broadcast domains and typically a getdc request from NT is a broadcast it sounds like you have the routers setup to forward netbeui traffic but not IP broadcasts. It sounds like you tried using the IP Forward command for UDP - if you enable IP Helper on your Cisco routers and tell IP Helper to forward to the subnet with the PDC and BDC I think it may solve your problem. If you go to the interface config prompt the syntax is ip helper-address x.x.x.x where x.x.x.x is the ip address the router should forward IP broadcasts to. (The upstream router or the BDC) Hopefully, this helps...

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