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Re: [Openvpn-users] LJ's "cons" of OpenVPN: how serious is latency?

  • Subject: Re: [Openvpn-users] LJ's "cons" of OpenVPN: how serious is latency?
  • From: Jason Haar <Jason.Haar@xxxxxxxxxxxxx>
  • Date: Wed, 22 Dec 2004 15:19:04 +1300

Florin Andrei wrote:

On Tue, 2004-12-21 at 13:48 -0800, J. Perkins wrote:

I'm just wondering how important these considerations are in practice.
somebody says OpenVPN is "relatively slow", is that "slow" in an
academic, computer-science inefficient inter-process communication sort
of way, or slow in a my-users-will-complain sort of way? (And what
"fast" VPN method are we comparing this to, anyway? IPSec?)

It's really a matter of joining the dots...

Client -> VPN-software -> Oz -> Internet -> Canada -> VPN-software -> Server

now - where do you think the bottleneck is :-)

userland vs kernelland VPN/crypto performance issues are going to PALE INTO INSIGNIFICANCE compared with the 200-400ms latency you will have on that long-haul between Canada and Australia.

I should know. Our IPSec VPN WAN has links from NZ to places in Canada and Sweden. Wanna see latency? Wanna see not being able to get more than 240Kb/s single-connection transfers on 4000Kbs links? :-)


Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1

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