I have three systems A,B,C. I want to configure A in such a way that all packets from A to C goes via B.

I tried:
1. ip route add 'ip of C' via 'ip of B'
2. route add -net 'net address' netmask gw 'ip of B'

These commands work initially when I try a ping or traceroute and expire after attempting ping twice or thrice.

If it's the same network, then the traffic will already be going to all 3 PCs.

Instead, use a VLAN.

1 members found this post helpful.

Actually, brebs, this isn't correct, and a VLAN won't have any effect on it.

Every computer sees only its own incoming traffic and obeys only its own rules. If the OP wishes for traffic to "go from A to B via C," this means that two routes must be established, on two machines:

1. "A" must route the traffic to "B" ... designating "B" as a gateway. (Because "B" is not the final destination.)
2. "B" must also know to route the traffic coming from "B," to "C."

There are two "hops" here, and each participant – each "hop" – must independently(!) know what to do with the packet. Packets do not carry any information whatsoever that says how they should be routed. Each and every participant makes its own independent routing decisions with regards to the traffic that is presented to it.

Furthermore, since traffic is two-way, the reply packets must also be able to make their way back home. Each "hop" computer, operating independently, must know how to do the right thing.

In this scenario, "B" is effectively a router that 'exposes' "C" to "A."

1 members found this post helpful.

Thanks brebs and sundialsvcs.
The problem here is that when I set B as gateway in A and C, it works perfectly fine in a windows system. All network traffic gets routed via B.
The same isn't happening in a PC with RHEL.

A's IP Address: 192.168.0.130
B's IP Address: 192.168.0.150
C's IP Address: 192.168.0.140

In Windows systems we achieve routing A's and B's traffic via C by running the following commands in A and C:
route delete 192.168.0.0
route add 192.168.0.0 mask 255.255.255.0 192.168.0.150

After executing the above commands, all network traffic from A and C will be routed via B.

I am looking for a linux equivalent of the same.

Hi,

I was able to solve the problem by performing the following steps:

1. Static IP address was set.
2. Gateway IP was set to the IP of system B.
2. Automatic DNS was turned off.
3. Network was restarted.
4. Default route entry of the Network Address has to be deleted.

After doing these steps in Systems A and C all packets were getting routed via B.

Hi...

Glad you got it working. If you would, please mark this thread as "SOLVED" by clicking on "thread Tools" directly above your initial post. Thanks!

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Regards...

Solved..!!