> John Fulmer wrote:
> >
>
> <snip>
>
> >
> > The way I've seen this done (on BSDI boxen, I think) is that the system
> > does an arp for it's own IP address before/as the interface is brought up.
> > It it gets a response, it assumes that there is another box out there with
> > the same IP address (not a BAD assumption).
>
> This IIRC is a gratuitous arp. In the kernel source I have seen
> references to it but I have never actually seen on used in a linux box.
> I first noticed this when moving a virtual ip address from one machine
> to another. No gratuitous arp. Then I also noticed the same behaviour
> on the "main" nic ip address.
>
no a gratuttous arp is a broadcast ARP response, telling eveyone who you
are before they ask. arping to see if someone else has your address is a
different ballgame.
David Lang
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