Hello I posted this a few days ago and got no answers. Can anyone point me some directions? Regards Ethy Begin forwarded message: Date: Thu, 3 May 2007 15:45:20 -0300 From: "Ethy H. Brito" <ethy.brito@xxxxxxxxxxxx> To: netfilter@xxxxxxxxxxxxxxxxxxx Subject: conntrack and SIP Hello I have these two SIP clients behind two linux NAT. they both connect to the same server. On client 1 I have: udp 17 174 src=192.168.0.201 dst=X.X.X.X sport=5060 dport=5060 src=X.X.X.X dst=Y.Y.Y.Y sport=5060 dport=5060 [ASSURED] use=1 Note that the sport and dport were not changed from in and out. But on client 2: udp 17 171 src=10.172.40.118 dst=X.X.X.X sport=5060 dport=5060 src=X.X.X.X dst=Z.Z.Z.Z sport=5060 dport=1024 [ASSURED] use=1 What could cause the change in dport?? I have no SNAT or DNAT rules in any of them. Is that a way to copy the client 1 behavior to client 2? Client 1 is iptables version 1.3.3 and kernel 2.4.33 Client 2 is iptables version 1.3.5 and kernel 2.4.33.3 -- Ethy H. Brito /"\ InterNexo Ltda. \ / CAMPANHA DA FITA ASCII - CONTRA MAIL HTML +55 (12) 3797-6860 X ASCII RIBBON CAMPAIGN - AGAINST HTML MAIL S.J.Campos - Brasil / \ -- Ethy H. Brito /"\ InterNexo Ltda. \ / CAMPANHA DA FITA ASCII - CONTRA MAIL HTML +55 (12) 3797-6860 X ASCII RIBBON CAMPAIGN - AGAINST HTML MAIL S.J.Campos - Brasil / \