ARP replies contain wrong MAC address

Posted by Jayen on Server Fault See other posts from Server Fault or by Jayen
Published on 2011-03-15T06:43:32Z Indexed on 2011/03/15 8:12 UTC
Read the original article Hit count: 275

Filed under:

linux

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bridge

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arp

I've got a robot running linux with wired and wireless adapters. When I boot up, it connects to the wireless fine. When I assign an IP to the wired (either statically or with DHCP), it looks like it works. As in, ifconfig shows a proper IP and route shows proper routes. However, when I do an ARP request of the wired IP, the ARP reply contains the wireless MAC.

??? There's no bridge running on the robot, so why don't I get the wired MAC???

When the wire is disconnected, the wired IP replies to ping...

Why is the robot replying over the wireless interface to IP requests on the wired???

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