[plug] Routing tables for hybrid Linux & Windows network

[Mark Dixon]

Can anyone help with IP routing setup for a hybrid Linux & Windows network?

I have an existing LAN with a mixture of Linux (Fedora Core 3) and 
Windows XP hosts, interconnected via a Wireless & Ethernet Router (a 
Linksys WRT54GS).  The router is connected to the Internet via an aDSL 
modem.  I've made a diagram of it at http://anysize.com/anynet.png  Each 
of the hosts can route traffic to all of the others and to the Internet. 
  All IP addressing for the existing LAN is 192.168.1.0/24  This all 
works just fine.

I have just connected another Linux box to one of the Windows XP boxes 
with a direct Ethernet connection (using a roll-over cable) and used 
network 192.168.2.0/24 for this.  In the diagram 
(http://anysize.com/anynet.png) this is the bit shown as "New: Linux box 
& Ethernet link".  This also works: for example I can ssh to the new 
Linux box from the Windows XP box that directly connects to it.

Now I want to be able to route traffic between the new Linux box and the 
other hosts on the existing network.  I have made a few attempts at 
setting routing table entries (with the Linux and the Windows "route" 
command) but so far haven't managed to get it right.  I'm guessing there 
are some things in the Windows XP box that routes between the old and 
the new networks that might be preventing traffic from flowing between 
the two networks - perhaps the Windows internal firewall software.  I'm 
guessing that because it was set up with the wizard for "home office 
networking" as a "PC which accesses the Internet via a Residential 
gateway" - I take it that process makes several assumptions and stores 
them in various places that I probably don't know about.

Can anyone advise what route commands, any any other network settings, I 
should use at each host to set this up for smooth inter-network traffic?

Cheers, Mark Dixon.