In article <y7r7l3rxvlx.fsf@sytry.doc.ic.ac.uk> you wrote: > but 2.4 doesn't have that option. I might be missing something, but > it seems that 2.4 is stuck with the undesirable ARP behaviour. You could use iptables arp filter module and filter those arp responses. Or turn off ARP and use an arpd user mode. Not sure if there is a sysctl to stop the neighbour code to answer arp requests. Greetings Bernd - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org