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 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
