Still no joy with this issue. I was asked to try:
>Try this, . >Go the the ubuntu machine (network 192...) and listen to icmp packets in the interface connected to the >172... network. > >Then get a machine from network 172... and try to ping it. > >You did a tcpdump on the pf pseudo-interface before but you're problem doesn't seem to be routing and >or pf filter rules. >If you see ICMP requests coming from another ip, you have a nat in between and that would justify >your "one way ping". I got these results from this: tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 08:30:28.359774 IP pupil-laptop.local.ssh > 172.16.0.6.49797: P 1505958084:15059 58280(196) ack 379641432 win 566 08:30:28.361092 IP pupil-laptop.local.50398 > 212.23.3.100.domain: 33472+ PTR? 6 .0.16.172.in-addr.arpa. (41) 08:30:28.361960 IP 172.16.0.6.49797 > pupil-laptop.local.ssh: . ack 196 win 66 08:30:28.375114 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 5, length 64 08:30:29.375137 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 6, length 64 08:30:30.375146 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 7, length 64 08:30:31.375134 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 8, length 64 08:30:32.375144 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 9, length 64 08:30:33.359178 IP pupil-laptop.local.50845 > 212.23.6.100.domain: 33472+ PTR? 6 .0.16.172.in-addr.arpa. (41) 08:30:33.375117 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, seq 10, length 64 08:30:34.375156 IP pupil-laptop.local > 172.168.0.6: ICMP echo request, id 4893, Does this look irregular? Martin Toft-2 wrote: > > What happens when you ping from the OpenBSD router? Does any of the > other equipment reply? > > The Ubuntu machine's firewall settings can be seen by running 'sudo > iptables -L -v -n'. Are you sure it doesn't block incoming ICMP > requests? > > Martin > > > -- View this message in context: http://www.nabble.com/Router-ping-one-way-only-tp21569634p21600393.html Sent from the openbsd user - misc mailing list archive at Nabble.com.
