Making the server route all non-local IP-requests to a ISDN-routers

I've got a Red Hat 5.2 server running the standard kernel. I also have a DNS on it. I want it to route all IP-requestst that are not for our network segment to go to a ISDN-router (a 3COM OfficeConnect 511) which would call our ISP and make  an internet connection. I've got also a default route to a gateway (the router) configured.

I've tried anything I could figure out and read about all the HOWTO's on the networking (I think). I'm desperate.
lionmasterAsked:
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harrysConnect With a Mentor Commented:
for the example:
the router has ip 192.168.2.1
your subnet is 192.168.2.0

route add -net 192.168.2.0 eth0
route add default gw 192.168.2.1
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alexbikCommented:
What exactly is your problem? Is your default route not working?
Could you show us the output of route -n ?
Please let us know what the IP address is your router has on your network.

Alex.
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lionmasterAuthor Commented:
Whenever I configure a W95 with as DNS the Linux server and Gateway the router it whatever I do, it does not find the way out. Now, I know it is supposed to find a DNS for translation (I don't know where to put the ISP's DNS's in the DNS) but when I use the IP-address directly it doesn't work either.

Route -n:
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.221.0   0.0.0.0         255.255.255.0   U      1500 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U      3584 0          0 lo
0.0.0.0         192.168.221.42  0.0.0.0         UG     1500 0          0 eth0

The subnet is 192.168.221.0 .
The router has IP 192.168.221.42 (not very much according to standards) Does it have to be 1?

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