Can't see others in iChat over Fiber Optic connection

This was a strange, recent occurence. For the past few years, those of us on Macs (G5's and a PowerBook with latest OS and updates) have been able to communicate via iChat. With new offices, most Mac users went to the new building. I'm still in the old building where the network server is kept. Once the others moved, we are no longer able to see each other via iChat. The only exception are two stations in the same office which share the same Ethenet wall connection.
Bringing any station back into the old building and connecting to the network will allow this station and my station to see each other, so I've narrowed the situation to our cable connection from the new building to the network server here in the old building. The cable used to bridge the two buildings is a Belkin 3 meter Multimode LC/ST Duplex Fiber Optic Cable.
I am able to see other Macs on the network through the Finder. I've just lost iChat and VNC capabilities since we've gone to this connection. If anyone has any ideas on how to correct the situation, whether they be adjustments to the Macs' Network settings or ideas of proven alternatives to the connection, all would be appreciated.
Thanks.
G5   Mac OS X (10.4.8)  

Hi DrVvack,
Welcome to the Apple Discussions
It is likely that the computers in the new building are in a different subnet of the LAN
Lets say you are at 192.168.1.100.
Others in your building also start 192.168.1.xxx
The other building is likely to be on a router for that building. Now the router is probably at an IP that is in the same group as your computer - but it will be issuing IPs of it's own.
Now a bit like street numbers this other router could be using a similar set of IP addresses (192.168.1.xxx) but it is the IPs in relation to the original routing device that makes a difference.
You can get around this by creating a Virtual Private Network then the Bonjour side of iChat will see everyone.
Another option is to have the second router in Bridge mode or Access point mode (not routing) and have everyone have an IP from the original device.
10:41 PM Wednesday; February 14, 2007

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