Help on how to separate WAN and LAN (2 Ethernet ports)?

brab

Senior member
Jan 27, 2000
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I have a FTTH DRG box installed with 2 ethernet ports.

One provides Internet WAN and the other IPTV.
The WAN cable goes to Linksys WRT54G router and from the router to local computers.

My mobo has two lan ports, one is connected to WRT54G and the other one I plug in the IPTV cable.
IPTV I watch through Mozilla Firefox.

This is where the problem starts.
Once I enable IPTV LAN my other one where the WAN is connected just basically starts working half-a$$.
IE won't go to websites, Outlook can't check email etc...
The only thing that works fine is Live Messenger.

Can somebody please guide me as to how to isolate the two networks, so only Firefox will use IPTV and rest of the computer WAN connection?
If that is possible that is of course.

Appreciate the help in advance!