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Re: [Openvpn-users] Re: Performance problem


  • Subject: Re: [Openvpn-users] Re: Performance problem
  • From: Andre Tann <atann@xxxxxxx>
  • Date: Fri, 7 Apr 2006 18:31:54 +0200

Charles Duffy, Mittwoch, 5. April 2006 15:11: 

> See if you have patterns where large packets sent on one side
> show up as multiple smaller packets on the other, are rejected en
> route such that they need to be resent as fragments by the
> endpoint itself, or simply disappear.

I'm not so familiar with these things - how can I see if one single 
packet gets divided into multiple smaller packets? Aren't there 
going hundreds and thousands of packtets through the line? How can 
I tell by hand if there is fragmentation? How can I count the 
packets to see if some get lost?


> OpenVPN's mtu-test will try to automatically determine what the
> largest packet size that actually goes through is; you can then
> use its values to update your config file.

Sorry about this question, but how can this be done? Is it something 
like

openvpn.exe --mtu-test --dev tun0

on the client side? While the vpn connection is established? I can't 
find out the right syntax for windows - it says "--ifconfig is 
required", but --ifconfig <what>?


> That said, when you have a specific issue like this, "anything
> unusual" is a good thing to look for. Is the database client
> doing continuous communication with the server during the startup
> phase, or is there a wait state somewhere where it pauses?

During the startup phase the client does a nearly continuous 
communication with the server for about 15, 20 secs, when connected 
through ipsec.
When connected through openvpn, then the startup phase generates 
pieces of traffic for half a second or so, then two or three 
seconds silence, then again a little piece of traffic, and this 
goes on for about two minutes.

 

-- 
Andre Tann


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