Can't See Other LANS over the WAN!

[bunchman]

We have a WAN set up over a total of 5 LANS at 5 sites. The problem is, at site 1, you cannot see the network at site 2, or any of the other sites for that matter.
Each site can only see within itself.
For example, GHS-1, can see all the computers on it's LAN, but can't even see the domain CPS-1 at another site.
However, all sites communicate over the WAN to access the proxy server, which is alone on a domain.
Using Cisco Routers & Switches along the way..
Site 1: 192.168.10.1 (Router)
Site 2: 192.168.20.1 (Router)
etc..for 5 sites.
The IP Schemes at each site follow the router scheme, being .2-.254
All subnet masks are 255.255.255.0
What am I missing??!

 

[mcconmw]

Do you have trusts established between the domains? What OS's are you using?

 

[Guest_imported]

You may want to start at your filtering in the routers. Many routers have a default to filter out netbios traffic (assuming your are using MS TCP/IP) Alternately, you can look into implementing a WINS server. If the LANs are using broadcast packets to "find" other hots, broadcasts do not usually cross routers, and cannot, therefore, see the hosts on the other LANs. A WINS Server will fix this problem by forcing a central registration where the computers are required to be listed, and can be found.

 

[bunchman]

Using Windows Backoffice for servers, and all clients are 98 SE.
Don't believe we have a WINS server- what kind do you recommend for WINS server?
Is there a quick way to make the router not filter that traffic? (using Cisco Catalyst Routers)

 

[wybnormal]

Bunchman- Routers by default filter out broadcast.. things like DNS, DHCP, part of the windows WINS resolution ( B node and such)and part of the login authenication.

A simple fix is to enable ip-helper on effected interfaces.

UDP PORT
Common Name.

69
TFTP

67
BOOTP Client

68
BOOTP Server

37
Time Protocol

49
TACACS

53
DNS

137
NetBios

138
NetBios Datagram

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin