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[Openvpn-users] Re: Assertion failed


  • Subject: [Openvpn-users] Re: Assertion failed
  • From: Charles Duffy <cduffy@xxxxxxxxxxx>
  • Date: Mon, 01 Aug 2005 12:23:39 -0500

On Mon, 01 Aug 2005 18:49:26 +0200, Luciano L. Mannucci wrote:
> I'm getting a message saying "Assertion failed at mtcp.c:411" in the log
> and the openvpn server program exits. This happens when two computers
> coming through the same natting firewall try to use the same
> certificate, thus getting the same IP address. I am assigning IP
> addresses via ccd and I use TCP instead of UDP. This thing is very bad
> because it leads to Denial Of Service attack.

First, for any production system you should have a solution in place to
restart the OpenVPN service (like other critical processes) whenever it
exits. I use runit [http://smarden.org/runit/] for this purpose.

Second, your client systems should use the "nobind" directive in their
config files. Are they doing so presently?

I don't intend to imply by any of the above that the behaviour you're
observing doesn't constitute a bug.


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