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Re: [Openvpn-users] Problem bridging with tap.


  • Subject: Re: [Openvpn-users] Problem bridging with tap.
  • From: Charles Duffy <cduffy@xxxxxxxxxxx>
  • Date: Mon, 07 Aug 2006 07:54:48 -0500

Toby Inkster wrote:
> I've downloaded the bridge-start and bridge-stop scripts from
> openvpn.net and substituted in my network parameters where required, but
> if I run:
> 
> 	/etc/init.d/openvpn stop
> 	/etc/openvpn/bridge-stop
> 	/etc/openvpn/bridge-start
> 	/etc/init.d/openvpn start
> 
> and then connect to the server from the client, the client and server
> are no longer able to ping each other -- indeed the client can't ping
> anything on the server's LAN, and vice versa. Only by stopping the VPN,
> stopping bridging and restarting the VPN without bridging are they able
> to see each other again.
> 
> Does anyone have any ideas?

You'll need to look at how your bridge is configured when it's 
supposedly up. Use "brctl show" to see that the bridge exists and your 
tap and ethernet devices are members of it; then use ifconfig or 
comparable tools to validate that the bridge is up and has an IP 
address, and that both of the devices which are members of the bridge 
are up but have no IP addresses assigned. Also, validate that your 
firewall rules aren't preventing the bridge from sending or receiving 
traffic.

(You'll eventually want to use bridge-start and bridge-stop as up and 
down scripts such that OpenVPN invokes them for you).

(By the way, I know you'd rather not run a WINS server -- but from a 
bandwidth-efficiency and scalability perspective, it's arguably the best 
choice).

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