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Hi all,
We run a small OpenVPN server in UDP mode here that has anywhere from
20-40 clients connected at any given time. One of our users has
recently been complaining of significant lag (which manifests itself in
keystrokes that take 5-10 seconds to appear on screen) when using Remote
Desktop over an OpenVPN connection. Some more details:
0. The OpenVPN server is not taxed in the least; CPU usage hovers around
1% and bandwidth averages 500Kb/sec
1. The user only experiences this lag when the network is congested:
usually around 10pm at night (he is coming into our network over a
Sympatico connection).
2. When using the built-in Windows XP VPN client to connect to his
desktop via Remote Desktop, the lag all but disappears (this is on
the same congested network, around the same time of night).
3. There is a packet shaper between the user's home and our network, but
this has been ruled out as the culprit by turning it off for OpenVPN
traffic.
4. I saw a posting a while back on the list where James suggested
fiddling with the MTU datagram sizes, but that doesn't seem to be the
problem here since the user is not experiencing any lag during
non-peak usage times of the day.
5. We are going to test the user on a server running OpenVPN in TCP
mode, but I'm not too hopeful about that since the manual indicates
that this almost always gives worse performance overall.
I realize this may not be an OpenVPN issue at all, but I thought I would
write the list and see if anyone else has experienced similar problems.
Thanks in advance,
Matt
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