Hi All,
I have an isolated network consisting of 3 machines Router(running on Redhat 9, it had dhcp/router services),Server A(windows) and Server B(windows). I want all traffic passing through ServerA to serverB pass through the Router. I have Network emulating software on the router machine; for it to emulate, all the traffic should pass through the router machine.

Server A <-----------> Router <------------------>ServerB

Can somebody tell me how to configure my router(redhat 9) to handle this case? Thanks in advance
Regards,
Puru

The www.tldp.com (The Linux Documentation Project) has a linux-router howto as well as the Network Administrators' Guide.

More generally, I don't understand what you meant by network emulation software. Since you are on an isolated network, why not set up all of the machines on the same network and use a hub or switch. It doesn't seem that you even need a router or gateway in your case. You could use the linux box for network services.

thanks for your reply. i couldn't find the required setup in that site.network emulate is used to emulate/simulate real time network conditions like congestions,delays ,bandwidth etc between those two servers .
puru

if you add the line:
FORWARD_IPV4="yes"
to the /etc/sysconfig/file, packets will be able to be forwarded from one interface to the other. There may be 'route' commands you need setup somewhere also.

What you are doing sounds like the Redhat box needs to be set up to function as a gateway. I don't have Redhat, but I'm sure it has some sort of gateway setup wizard or dialog. Also, the NAG guide should have enough information to help you configure things manually.

Here is a how-to that might help a bit.
http://www.tldp.org/HOWTO/Home-Netwo...i-HOWTO-3.html

On second thought, sounds more like a linux-switch. Embedded linux systems like the Linksys WRT54G cable router is one example. Besides being a wireless cable/DSL router, it is a 4-port switch and dhcp server. Studying this or other embedded systems might teach you a lot.