I have changed the IP address of that interface to 10.10.4.6 so that routing scheme will not fail (It is certain that, the system will drop any packet it receives if it has its own IP number). NAT is done correctly now, so the adress 10.10.4.5 will not be necessary on the eth0 interface. Regards... -----Original Message----- From: asterr [mailto:asterr@pobox.com] Sent: Monday, August 23, 2004 7:03 AM To: Josan Kadett Cc: linux-net@vger.kernel.org Subject: RE: Very unusual NAT configuration... Do not assign 10.10.4.5 to ANY interface on the router. Then you should be able to fix the routing so that the pings work. NAT does not require any of the referenced IP addresses to be present on the router. As long as the packets are being routed into the NAT box, NAT will happily inspect the IP headers of every packet. If the headers match one of the NAT rules, then the NAT code will modify the header for you. -Aaron - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html