If you have a dual-homed host and ifdown one of its interfaces, Linux
(2.3.99) continues to generate arp replies on behalf of the downed
interface's IP address. It does so until the device is actually
unregistered.
The user-visible effect of this is that the downed interface's IP
address continues to appear on the network until ten minutes later when
cron reaps the driver module.
Is there a reason for this behaviour?
I would have thought that downing an interface should imediately make
its IP address disappear from the network. If an admin were to down an
interface, then walk over to another machine and bring up an interface
with the same IP address, sticky things could happen.
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