What's the effect of this rule on a multihomed box (the IPs below are just some examples, not real): iptables -A INPUT ! -d 1.2.3.4,2.3.4.5 -p all -j DROP Will it drop all packets not destined to both these IPs? Or will it drop all packets but for the first IP? Ie. when negating a rule on multiple elements, is then the result an AND or an OR combination? Ie. is it then !ip1 AND !ip2, or is it !ip1 OR !ip2 ? :-) Man page says this: [!] -s, --source address[/mask][,...] [!] -d, --destination address[/mask][,...] A "!" argument before the address specification inverts the sense of the address. [...] Multiple addresses can be specified, but this will expand to multiple rules (when adding with -A), or will cause multiple rules to be deleted (with -D). -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html