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Re: [Openvpn-users] 2.0b2: problematic `--ping' timer drift


  • Subject: Re: [Openvpn-users] 2.0b2: problematic `--ping' timer drift
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Thu, 3 Jun 2004 14:57:53 -0000

Joshua Judson Rosen <rozzin@xxxxxxxxxxxxx> said:

> I've been experimenting with OpenVPN in scalable-udp-server mode using
> two Debian GNU/Linux machines; after leaving the VPN running
> overnight, I found the log showing *very* frequent ping-restarts: the
> client was configured with "--ping-restart 60" and had got into a
> state in which it was triggering restarts *every minute*, despite both
> the server *and* the client being configured with `--ping 1'. The two
> machines are the sole occupants of a new ethernet switch, so I figured
> that the problem probably wasn't the network losing or abusing
> packets....

This is a known bug in 2.0-beta2 -- the ping may not get rescheduled after
firing during periods of high network activity.  A fix has already been
written and will be in beta3.

As far as "drift" is concerned, by design, a random time interval between 0
and 1 second is added to all OpenVPN timers which are set to more than 1
second.  This is designed to prevent bursts of timer-triggered activity when a
large number of clients are present.

James


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