Hello, How I can do that the iptables that my IP INVALID (192.168.0.1) in the OUTPUT transform my IP INVALID for ip valid in the output (200.200.200.1) using SNAT Example IP: Internal 192.168.0.1 port 53 External 200.200.200.1 port 53 I want when to request internal 192.168.0.1:53 he leaves how ip external 200.200.200.1:53 I tried to do that. But no this working iptables -t nat -I POSTROUTING -p udp -s 192.168.0.1 --sport 53 -j SNAT --to-source 200.200.200.1:53 Breno Cardoso Perucchi breno@omegatec.net