Hi I have 2 connections to the Internet. The default route points to ISP1 but my mails are comming from (to IP of) ISP2. My rules to DNAT SMTP Traffic to an internel machine does not work (it did with only one ISP). I think it has something todo with the routing but i dont know how to solve. Here are my rules: $IPTABLES -t nat -A POSTROUTING -o $EXTIFINODE -j SNAT --to $EXTIPINODE $IPTABLES -t nat -A POSTROUTING -o $EXTIFPOST -j SNAT --to $EXTIPPOST # for mailserver $IPTABLES -t nat -A POSTROUTING -o $EXTIFINODE -s 192.168.100.2 -j SNAT --to $EXTIPINODE$IPTABLES -t nat -A POSTROUTING -o $EXTIFPOST -s 192.168.100.2 -j SNAT--to $EXTIPPOST$IPTABLES -t nat -A PREROUTING -i $EXTIFINODE -d $EXTIPINODE -s$UNIVERSE -p tcp --dport 25 -j DNAT --to 192.168.100.2$IPTABLES -t nat -A PREROUTING -i $EXTIFPOST -d $EXTIPPOST -s $UNIVERSE -p tcp --dport 25 -j DNAT --to 192.168.100.2 thanks for any help Andreas Grabner
