David Lang
On Thu, 30 Sep 1999, B. James Phillippe wrote:
> On Thu, 30 Sep 1999, David Lang wrote:
>
> > On Wed, 29 Sep 1999, Christopher McCrory wrote:
> >
> > > John Fulmer wrote:
> > > >
> > > > 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
> ...
> > 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.
>
> Well, actually the original comment _does_ describe a gratuitous ARP, which
> is defined as an ARP request sent for your own protocol address. All ARP
> requests are broadcast. There are no responses to a gratuitous ARP, unless
> there is an IP conflict. However, you're right in that the gratuitous ARP
> doesn't itself have anything to do with address conflict detection. That
> would be an additional (rather simple) step. Gratuitous ARP's alone are
> handy for hot-swapping routers or NIC's.
>
> -bp
> --
> # bryan at terran dot org
> # http://www.terran.org/~bryan
>
>
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