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<p class=MsoNormal>I don't even know how to describe this in a subject line.
This is a single tunnel connecting two sites. Both are running U2.6.25 on
Fedora 12. A telecom issue took out the left side yesterday. The telecom
issues were fixed a few hours ago and folks on the left side could ping the
right side. The tunnel was up and running again. Well sort
of. Exactly one user on the left side was able to launch an RDP session
to the RDP server on the right side. Nobody else could make this happen.
However, everyone on the left side could ping any host they wanted on the right
side. They could do RDP sessions to **other** hosts on the right side, just not
this particular host – the one everyone cared about. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The left side is 10.86.2.nnn/24, right side 10.86.0.nnn/24.
The relevant terminal server on the right side is 10.86.0.20. The right
side also has 2 other servers at .9 and .15. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Watching tcpdump on both sides, I saw tcp 3389 stuff (RDP
packets) coming out of the left side, but never reaching the right side.
Curiously, the left side sent out ARP queries looking for 10.86.0.20,which is
weird because that’s a completely different subnet. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>But here is the strange part. The Windows XP host at
10.86.2.104 could successfully do RDP sessions to 10.86.0.9 and 10.86.0.15, but
not to 10.86.0.20. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In desperation, I rebooted the left side firewall,
restarting everything, and now it all works. Everyone is up and
running. It’s not possible to make up this kind of stuff. How
in the world do I troubleshoot something bizarre like this??<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here’s a record from /var/log/secure. This was
during the outage<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Jun 25 11:12:09 localhost pluto[2288]:
"garelick-hq" #667: STATE_MAIN_R3: sent MR3, ISAKMP SA established
{auth=OAKLEY_RSA_SIG cipher=aes_128 prf=oakley_sha group=modp2048}<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any thoughts?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Greg Scott<o:p></o:p></p>
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