Hello everyone, I don't have much knowledge in routing and I've reached a problem that I'm unable to solve. Here is a quick diagram that I've made:http://imageshack.us/photo/my-images/37/netv2.png/


My goal is to enable System A to talk to System D. As of now, the System A is able to ping Linux Machine 1 and System B, but is unable to even ping Linux Machine 2.

System B is able to ping System A, Linux Machine 1, Linux Machine 2 and System C. In fact, Systems B and C are able to communicate just fine.

My question would be, what do I need to do in order to enable System A to talk to System D(and vice versa).

Things I've tried:

• Static routes in Linux Machine 1/2
• Static Routes in switch

None of these things seem to work, any help would be greatly appreciated!

Check your output from tracert and see how far your packets are getting.

The interfaces attached to the switch do not share a network address (assuming class-c [/24] networks and eth0 is attached to the switch). So add an alias to each LM:

On LM-1:
ifconfig eth0:1 172.31.254.1 netmask 255.255.255.252 up

On LM-2:
ifconfig eth0:1 172.31.254.2 netmask 255.255.255.252 up

Configure a dynamic routing protocol such as RIP or OSPF for each LM to learn the routes to the other's subnets

-- or -- assign static routes:

On LM-1:
route add -net 172.10.2.0 netmask 255.255.255.0 gw 172.31.254.2
route add -net 172.11.2.0 netmask 255.255.255.0 gw 172.31.254.2

On LM-2:
route add -net 172.10.1.0 netmask 255.255.255.0 gw 172.31.254.1
route add -net 172.11.1.0 netmask 255.255.255.0 gw 172.31.254.1

That should work.