Hi, in my internal network someone is using a kind of arp poisoning, since two (or more) computers results _sometimes_ associated to the same MAC address. Since I've got a linux firewall-proxy (iptables and squid) that limits the traffic depending on the mac address, this is a problem for me. Is there a solution to solve the problem? Thanks, Luca -- Luca Ferrari, fluca1978@xxxxxxxxxxx - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html