After remove enthernet cable, what are the steps for linux to update the ARP table ?

5883 · 11-30-2012, 12:26 PM

in desktop linux,
if i pull out ethernet cable from any eth port,
this ARP entry gets removed right away.

my question is, what are the steps to make this happen under the hood ?
(all i know is device driver will report "eth0 is down".)

who detects it and removes the ARP entry ASAP ?

thanks !

jefro · 11-30-2012, 04:24 PM

My guess would be some issue tied to disconnect report.

How are you checking cache and I assume you mean locally?

Skaperen · 12-09-2012, 09:09 PM

I suspect what the OP is asking for is whether the kernel does the flushing of the ARP cache itself, or if some userland program does it as a result of discovering this interface status change.