[SOLVED] Ping between 2 eth ports on the same machine

ritu.kaur · 09-17-2010, 07:42 PM

Newbie to linux.

I have eth1 and eth2 connected with back to back cable on the same machine.

I configure eth1 with 11.11.11.11 and eth2 with 11.11.11.14.

I use ping -I eth1 11.11.11.14, I get Destination Host Unreachable...

using tcpdump on eth1 shows ARP request broadcast being sent out

using tcpdump on eth2 shows ARP request received, no ARP reply being sent out

Not sure whether this config is supposed to work?

Inputs appreciated.

jefro · 09-17-2010, 08:17 PM

Most cables are patch cables. While that isn't really bad you should have a cross over cable to be sure. Most newer nic's can auto correct for the wrong cable but it fails sometimes. Usually you have to power off the system then connect the cable. It may not auto correct if you plug it in after it has power. I do mean power from ac plug too. Many nics can be powered when the system is off.

If not that then test the cable.

And I assume icmp is not blocked, so you have to check that also.

ritu.kaur · 09-25-2010, 08:33 AM

Thanks, for the inputs, rechecked the cables and power-off/power-on machine, it works fine now.