Per: Les Mikesell lesmikesell at gmail.com Thu Sep 6 13:55:05 EDT 2012 > A 'route -n' should show you where any destination will head > on the next hop. On host C, what is the line with the > smallest matching destination/mask? Likewise, on the gateway > host where you think it is being forwarded the wrong way? $ /sbin/route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 aaa.bbb.ccc.0 0.0.0.0 255.255.255.0 U 0 0 0 bridge0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 bridge0 0.0.0.0 aaa.1bbb.ccc.1 0.0.0.0 UG 0 0 0 bridge0 $ traceroute 192.168.209.43 traceroute to 192.168.209.43 (192.168.209.43), 30 hops max, 40 byte packets 1 gway01 (aaa.bbb.ccc.1) 0.321 ms 0.298 ms 0.283 ms 2 ISPlink (aaa.bbb.ddd.53) 1.000 ms 0.993 ms 1.450 ms 3 * * * 4 * * * 5 * * * . . . This seems to say that 192.168.209.43 is being routed out to the Internet as aaa.bbb.ddd.53 is our external gateway address on the router. This is the routing table on the router: [root at gway01 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface aaa.bbb.ddd.52 0.0.0.0 255.255.255.252 U 0 0 0 eth0 aaa.bbb.ccc.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth1 0.0.0.0 aaa.bbb.ddd.53 0.0.0.0 UG 0 0 0 eth0 -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3