Messages in this thread | | | Date | Tue, 19 Aug 2003 19:10:10 +0200 | From | Stephan von Krawczynski <> | Subject | Re: [2.4 PATCH] bugfix: ARP respond on all devices |
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On Tue, 19 Aug 2003 09:51:05 -0700 "David S. Miller" <davem@redhat.com> wrote:
> On Tue, 19 Aug 2003 17:54:26 +0100 > Richard Underwood <richard@aspectgroup.co.uk> wrote: > > > When a HOST sends out an ARP request, it's NOT associated with a > > single connection, it's associated with the host. Why should it pick a > > "random" IP number to send as the source address? > > It's not "random", it is using the IP address it intends > to use as the source in packets it will output once the > ARP completes. > > In fact, if you look at the code in arp_solicit(), the source address > is coming directly from the packet we are trying to output.
Well, then you have a problem, at least with RFC-985 as quoted in my other email. If your host has two interfaces on two different pyhsical nets and host A from net A shall be contacted by a service bound to your interface on net B you will obviously send an arp request with a source ip from wrong subnet. I did not read the code, I take your code explanation as true, of course. It is very likely you will not receive a valid answer in this case:
<quote RFC-985> An ARP request is discarded if the source IP address is not in the same subnet. </quote>
Regards, Stephan
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