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Re: [Openvpn-users] trying to improve connection stability


  • Subject: Re: [Openvpn-users] trying to improve connection stability
  • From: "Adam Pavelec" <apavelec@xxxxxxxxxxxxxxxxxxxx>
  • Date: Wed, 18 Aug 2004 13:45:59 -0400

On Wednesday, August 18, 2004 1:14 PM [GMT-5=EST], Erik Anderson
<erikba@xxxxxxxxxxxxxxxxx> wrote:

> Just throwing a quick "FIXED" out to the list.  I'm fairly certain
> that the problem I was having was with the NAT switch not being able
> to handle two machines establishing two UDP conversations to the same
> port on the same machine...

Good to hear.  You're explanation is close.  The OpenVPN server shouldn't
have any problems handling multiple clients coming into the same UDP port.
However, when there are multiple clients on the same NAT'd network, the
server will get confused if they are all using the same local UDP port.
This is why it is a good idea to define a unique local port for each
client's configuration file on that subnet.

In my case, since the clients are always the initiators, I don't even need
to punch a hole through their firewall(s) to obtain a successful connection.
Of course, the server, which BTW is also NAT'd, will require that the
applicable port be accessible from the public side, not to mention having
that port forwarded accordingly.

Finally, I wanted to reiterate to James that the 'nobind' option solved my
clients' reconnection issues that were previously mentioned in this thread.

Thanks James!

-Adam



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