Hi, Yes, I do include udp as well. A tcpdump shows traffic two and from until I insert that rule, then there is no return traffic sent, its as though its being silently dropped, because nothing is in the logs either. If I change the port to 52, the return traffic apears, but of course, on the wrong port. > Hi > > >I am wanting to change the source address of outgoing packets that have a > > src port of 53. > > I have tried /sbin/iptables -A POSTROUTING -p tcp -t nat -o bond0 --sport > > 53 -j SNAT --to-source 192.168.0.1:53 > > If my understanding is correct, you want to do SNAT but without changing > the source port number. The above command should work. > Can you check out if your DNS requests are on TCP or UDP? If they are on > UDP, you may need to extend the above rule for UDP also. > > Regards > Prabha
