Description of problem: Ok, I have my Fedora Box setup as my local router. It does MASQ, SNAT, and strait gateway routing of my various networks and VPNs. When I was using the previous 2.6.38 fedora kernels everything was fine. Now that I'm using the 2.6.40 fedora kernels, every traceroute that "goes through" my fedora router, shows up as the destination ip of the trace. Version-Release number of selected component (if applicable): 2.6.40-4.fc15.x86_64 How reproducible: 100% Steps to Reproduce: 1. Setup IP forwarding 2. trace between networks Actual results: Tracing route to google.ca [74.125.226.19] over a maximum of 30 hops: 1 <1 ms 1 ms <1 ms 74.125.226.19 2 14 ms 13 ms 5 ms 10.250.84.1 3 6 ms 11 ms 10 ms 172.250.250.1 4 17 ms 11 ms 14 ms nf-stph-asr001.nf.eastlink.ca [24.222.23.237] 5 51 ms 244 ms 230 ms ns-hlfx-dr002.ns.eastlink.ca [24.215.102.77] 6 24 ms 28 ms 43 ms ns-hlfx-br002.ns.eastlink.ca [24.215.102.5] 7 31 ms 23 ms 22 ms ns-hlfx-br001.ns.eastlink.ca [24.215.102.9] 8 54 ms 52 ms 53 ms google.eastlink.ca [24.215.101.10] 9 54 ms 52 ms 56 ms 216.239.47.114 10 60 ms 48 ms 50 ms 72.14.233.142 11 56 ms 47 ms 48 ms 74.125.226.19 Expected results: Tracing route to google.ca [74.125.226.19] over a maximum of 30 hops: 1 <1 ms 1 ms <1 ms router.home [10.200.1.225] 2 14 ms 13 ms 5 ms 10.250.84.1 3 6 ms 11 ms 10 ms 172.250.250.1 4 17 ms 11 ms 14 ms nf-stph-asr001.nf.eastlink.ca [24.222.23.237] 5 51 ms 244 ms 230 ms ns-hlfx-dr002.ns.eastlink.ca [24.215.102.77] 6 24 ms 28 ms 43 ms ns-hlfx-br002.ns.eastlink.ca [24.215.102.5] 7 31 ms 23 ms 22 ms ns-hlfx-br001.ns.eastlink.ca [24.215.102.9] 8 54 ms 52 ms 53 ms google.eastlink.ca [24.215.101.10] 9 54 ms 52 ms 56 ms 216.239.47.114 10 60 ms 48 ms 50 ms 72.14.233.142 11 56 ms 47 ms 48 ms 74.125.226.19 Additional info: I have checked with a linux traceroute as well, the same thing happens, so this is not an issue with the windows tracert tool. I'm not sure if this has any security implications or not.
please post the exact forwarding setup that you used, so we can try to reproduce this.