OpenVPN Support Forum

Hi, I was wondering if there is anything I can do to make my VPN more efficient for my VMWare admin software.

What I mean is the VMWare vSphere client has a lot of lag in it and I want to know what I can do to my VPN to reduce some of the lag is the system.

I am running OpenVPN 2.1RC19 on Windows XP w/SP3 for my server, and my only client at the moment is a Vista Ultimate x64 SP2 with the same version of OpenVPN as the server.

As an attempt to improve performance I tried switching to TCP, that seemed to help a little bit even despite the overhead it generates. I added a QOS rule to my firewall also, and I switched from AES 128 to Blowfish. I was always told that blowfish is a little bit "lighter weight" than AES or 3DES.

Is there anything else I can do or something I should not have done?

I would recommend not using TCP for the VPN if you can help it. As you've already indicated you're aware, there is a considerable amount of overhead added when one is tunneling TCP within TCP.

One thing you may be able to do is run the MTU test. Simply add --mtu-test to the command options and the logs will indicated an optimal MTU setting. From there, there is not much more you can do.

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