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Mack.Joseph@xxxxxxxxxxxxxxx wrote (at Fri, Mar 11, 2005 at 09:59:21AM -0500):
> lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx wrote on 03/11/2005 01:21:46
> AM:
> > The real problem I've always had is that
> > I've never had a means for duplicating it (possibly because I didn't
> > fully understand the problem -- I can probably duplicate it at will
> > now),
>
> OK how do you duplicate it?
Attached is a piece of PHP (lvs-tun-test.php) that'll do it. The
"submit" query will timeout if you are experiencing the problem.
In order to force yourself to experience the problem, you need to
forcefully ignore icmp fragmentation-needed packets. I am able to do
that on my home network with a simple iptables rule on my firewall:
iptables -I FORWARD -p icmp --icmp-type fragmentation-needed -j DROP
Now, I browse the lvs-tun-test.php through LVS-Tun, and click submit,
and it just hangs and times out. tcpdump shows the expected results.
Then I change the MTU on the loopback interface on the real server
(It's a Win2k box) using regedit, then disable and re-enable the
loopback adapter via the network properties, then click submit again.
Poof, it works.
--
Casey Zacek
Senior Engineer
NeoSpire, Inc.
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