On Fri, 2005-02-11 at 04:52, Omar Garcia wrote: > Hi list, > > What`s the differences between these two groups of rules.????? > In the first i use MARK --set-mark to mark packets and in the other i use CONNMARK --set-mark > > 1. > # iptables -I POSTROUTING -t mangle -j CONNMARK --restore-mark > # iptables -I POSTROUTING -t mangle -m mark ! --mark 0 -j ACCEPT > # iptables -I POSTROUTING -t mangle -m ipp2p --ipp2p -j MARK --set-mark 30 > # iptables -I POSTROUTING -t mangle -m ipp2p --bit -j MARK --set-mark 30 > # iptables -I POSTROUTING -t mangle -j CONNMARK --save-mark > > 2. > # iptables -I POSTROUTING -t mangle -j CONNMARK --restore-mark > # iptables -I POSTROUTING -t mangle -m mark ! --mark 0 -j ACCEPT > # iptables -I POSTROUTING -t mangle -m ipp2p --ipp2p -j CONNMARK --set-mark 30 > # iptables -I POSTROUTING -t mangle -m ipp2p --bit -j CONNMARK --set-mark 30 > # iptables -I POSTROUTING -t mangle -j CONNMARK --save-mark first off--i'm sure this is just your typed example, but you *do* realize that using -I in every rule results in your rules ending up in reverse order, right? that is, your first group of commands will result in the following rules: *mangle -A POSTROUTING -j CONNMARK --save-mark -A POSTROUTING -m ipp2p --bit -j MARK --set-mark 30 -A POSTROUTING -m ipp2p --ipp2p -j MARK --set-mark 30 -A POSTROUTING -m mark ! --mark 0 -j ACCEPT -A POSTROUTING -j CONNMARK --restore-mark which is most certainly *not* the order you want when using --restore-mark and --save mark. anyways--to your actual question--i have found that version 1; i.e using -j MARK --set-mark instead of -j CONNMARK --set-mark, is more reliable. i have no idea why this is. i have a feeling that the CONNMARK target uses more intelligence to determine whether this packet should be marked or not. -j MARK --set-mark will just simply mark the packet; no fuss, no muss, and then -j CONNMARK --save-mark will save it to the conntrack table to be restored on the next packet in the connection--which is exactly what you want. -j -- "Alright brain, you don't like me and I don't like you. But let's just get through this and then I can get back to killing you with beer." --The Simpsons
