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Re: [Openvpn-users] server not receiving disconnect


  • Subject: Re: [Openvpn-users] server not receiving disconnect
  • From: James Yonan <jim@xxxxxxxxx>
  • Date: Wed, 20 Oct 2004 15:27:38 -0600 (MDT)

On Wed, 20 Oct 2004, Mathias Sundman wrote:

> On Wed, 20 Oct 2004, Matt Wilks wrote:
> 
> > I've got OpenVPN 2.0b11 running in server mode accepting connections.
> > Connecting from and XP box running the same version and Mathias' gui
> > gives me no problems except upon disconnect.  It appears that the server
> > does not receive a disconnect message when sent from the client, as I am
> > still getting spew like below into the log file.  Also, there are not
> > disconnect messages logged in the log.  It doesn't work even if I
> > side-step the gui and start it directly from a right-click on the conf
> > file.
> >
> > This becomes a problem when using the client-connect and
> > client-disconnect scripts.  client-disconnect isn't called until the
> > server is restarted and as a result, client-connect is only called the
> > first time a user logs in.  I have verified that restarting the server
> > disconnects all users, calling the client-disconnect script for each and
> > allows new connections to be made again.
> >
> > Is this a bug in beta 11 that is fixed in later releases?
> 
> In UDP mode the client normally does not notify the server when it 
> disconnects. Since beta11 there is an option (--explicit-exit-notify XX) 
> todo this. Set XX to the number of exit-notify packets the client should 
> send. There is no ack on this, that's why you can tell it send several 
> attempts, with a second of delay between each (I think).
> 
> If you use TCP the server should realise that a client has disconnected 
> when it recieves a TCP RESET packet, so there you don't need to use any 
> special option.

I'd like to eventually make --explicit-exit-notify ACKed and bidirectional 
so each side would know explicitly when the other side has gone down, 
rather than implicitly due to the expiration of ping-restart/keepalive.

James


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