Persistent tunnel vpn

Rainer Sokoll <R.Sokoll@xxxxxxxxxxxx> said:

> On Wed, Jun 16, 2004 at 03:36:13PM +0200, Jon Bendtsen wrote:
> 
> Hi,
> 
> > Are there any ways i can get openvpn to start up before the client logs 
> > on to the windows laptop,
> > such that they can logon to the windows domain through the openvpn 
> > tunnel ?
> 
> You could run openvpn as a service. Then the tunnel would be present
> when the user logs in.
> But: This seems to work only if the client has a connection to the
> openvpn server (of course).
> For example, if my client is in a hotel, the user can lo onto his laptop
> using the cached credentials. Then, he fires up a dialup connection to an
> ISP of his choice. But the openvpn service does not notice the new
> internet connection - no tunnel.
> It would be great if the service listens in the background an build the
> tunnel immediataly if it can reach the openvpn server.
> Or do I miss something?

The Windows client already does this.  In fact, I use this feature all the
time on my laptop.  If I'm disconnected from the internet, the OpenVPN client
waits until the internet connection is reestablished, then it reconnects to
the server.

The key is having something like this on the client:

# Client snippet
ping 10
ping-restart 60
persist-tun
persist-key
resolv-retry infinite


And something like this on the server:

persist-key
persist-tun
ping-timer-rem
ping-restart 60
ping 10