Comments on: Network routing

By: fhearne

fhearne — Fri, 28 Jul 2006 12:45:54 +0000

Hi first chance I have had to log into mail today. The only thing I would add is to make sure the remote route the you atrying to reach as static routes pointing back as the icmp will travel one way and not cone back.

By: cberganza

cberganza — Fri, 28 Jul 2006 12:34:50 +0000

wsbtech is right, the only way for your computers to properly send icmp packet using the .10 routers is to add a static route pointing to the remote site. If you’re using windows DO NOT use a secondary default gateway as they will start comflicting each other. Don’t forget to they all machines to allow icmp packets from your trusted networks.

By: wsbtech

wsbtech — Fri, 28 Jul 2006 10:37:36 +0000

The best way would be to put a static route on each machine pointing to the other network through the .10 gateway. This would eliminate bounced traffic between the routers. You can accomplish the same thing by putting a static route on the .10 routers pointing at the local network through the .9 routers.

The idea is the local default gateway routes ALL traffic to other networks, including incoming traffic.

By: burmuse

burmuse — Fri, 28 Jul 2006 08:19:32 +0000

Hi,
Make sure your machine firewall is not blocking icmp. XP default configuration will block them.
Do you able to map network share on other network? i.e. 2.x machines map to 1.x server or other way around.
It is hard for us to guess without seeing actual configuration . We can only suggest possible factors of problem. Have you try to sniff with ethereal/wireshark on your switch as weel as target machine.
Hope that will help you a bit.

By: tracybs

tracybs — Fri, 28 Jul 2006 07:14:12 +0000

Your hosts are using 1.9 and 2.9 as default gateways. Therefore they will send everything to them. It looks like 1.9 and 2.9 are sending back an ICMP redirect telling your host(s) to send to 1.10 and 2.10 properly. I would only guess that the far-side machine that you are trying to ping isn’t responding to the ICMP redirect from it’s .10 and that’s why you aren’t getting a response.

You should add a static route to your hosts pointing to the other network using the .10 as the gateway. That will help with the network load of all the ICMP redirects and ensure that the hosts can communicate with each other.