Hello, I'm new on this forum and hope you will help me. I'm building a Debian server and it is the basic stage. I wish to run Iptables with masquerade. detailed problem report could be find @ this address : http://homeusers.brutele.be/smardaga/masquerade/ resume : PC1 Debian Serveur PC2 | Eth0 Eth1 | |.1 .50| |.1 .2| | | | | | | | | --------------------------- ------------------------- 192.168.0.x/24 192.168.1.x/24 Masquerade don't work when pinging from PC2 (192.168.1.2) to PC1 (192.168.0.1). PC1 receives icmp packet with IP source address 192.168.1.2. tcpdump on eth0 : 20:30:25.472725 192.168.1.2 > 192.168.0.1: icmp: echo request 20:30:30.972679 192.168.1.2 > 192.168.0.1: icmp: echo request 20:30:36.472321 192.168.1.2 > 192.168.0.1: icmp: echo request 20:30:41.972217 192.168.1.2 > 192.168.0.1: icmp: echo request 20:30:47.472049 192.168.1.2 > 192.168.0.1: icmp: echo request 20:30:52.972084 192.168.1.2 > 192.168.0.1: icmp: echo request iptables release 1.2.6a Linux 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i686 unknown Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain POSTROUTING (policy ACCEPT) target prot opt source destination LOG all -- anywhere anywhere LOG level warning MASQUERADE all -- 192.168.1.0/24 anywhere LOG all -- anywhere anywhere LOG level warning Chain OUTPUT (policy ACCEPT) target prot opt source destination Any help and/or suggestions will be accepted gratefully. Thanks in advance, Stephan Mardaga