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[Openvpn-users] VPN dropping


  • Subject: [Openvpn-users] VPN dropping
  • From: Bradley M Alexander <storm@xxxxxxx>
  • Date: Thu, 2 Sep 2004 09:57:13 -0400

Hi,

I have kind of an odd problem recently. I just started a new job, and since
I got here, I have had problems with my VPN dropping fairly regularly. I am
using the same hardware I have had it on for the last year or so, a Mac
PowerBook G3 and my home firewall (PPro 200, but soon to be upgraded). Both
are running Debian Linux, the G3 runs unstable, and the firewall runs
testing.

The issue seems to happen whenever a large amount of traffic needs to come
down the tunnel, e.g. a directory listing of a particularly large
directory, or even on occasion doing something like a df or apt-get update,
the thing will freeze and eventually time out with a connection reset by
peer error. I am also not able to scp across the tunnel. scp sits there in
a -stalled- state forever. 

Nothing has changed on either end, but I talked to the admins
on this site in generalities, and they said they have a SonicWall firewall.
I know its nothing as blatant as blocking port 5000/udp, but I'm wondering
if it could be some kind of MTU problem going out across the firewall or a
router. I have had no problems with traffic on the regular ethernet out to
the Internet, just across the vpn tunnel. Right now, the MTU on the tunnel
ends is 1258, the MTU on the ethernet is 1500. The only difference
network-wise that I am aware of is that they are using a sonicwall
firewall, but I googled for openvpn interactions, and found nothing.

Anybody got any ideas on how to fix or work around this?

Thanks,
--Brad

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