On 22/01/2009, at 07:11, duxbuz wrote:
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
Whats the ip of pupil-laptop.local ?
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
Is 172.168.0.6 the correct ip for the server ?
Is that what you typed in pupil-laptop ?
You can say that the pupil-laptop packets are arriving at the
destination, but they get there with ip 172.168.0.6, which seems not
to be the server, so it passes the packet forward to the default route.
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
--
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Christiano Farina Haesbaert
christiano...@gmail.com
