problems pinging network addresses

Olusegun · 02-12-2003, 08:25 AM

I am running Red Hat Linux 7.3. I have two network cards installed and configured as follows:

10/100 - 200.200.200.111 (eth0)
10/100/1000 - 200.200.200.112 (eth1)

eth1 is plugged into a SPAN (monitoring) port on a Cisco Catalyst 2950 router. This SPAN port only monitors traffic and does not send any data.

My problem is that when I try to ping a network address, it says host unreachable because by default the Linux box is using eth1. How can I make eth0 the default network card for data communication, especially ping?

mychl · 02-12-2003, 09:43 PM

This *might* help....

Try using the route add gw command to add eth0 as your gateway. Or.... you could reset the ip's and switch the cables in the NICs....

HTH

thanhnx · 02-13-2003, 01:15 AM

first check whether both your cards are active
then
ping -I eth0

thanhnx · 02-13-2003, 01:53 AM

then
route add [−net|−host] target [netmask Nm] [gw Gw] dev eth0

Darin · 02-13-2003, 03:52 AM

Quote:

Originally posted by Olusegun

10/100 - 200.200.200.111 (eth0)
10/100/1000 - 200.200.200.112 (eth1)

That's two network cards on the same subnet, doesn't work unless they are configured as port trunks in the linux NIC drivers and the router.

You may be able to get away with a hack of linking the drivers to the other eth interfaces or switching the cables.

thanhnx · 02-13-2003, 05:01 AM

Darin right!