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Re: [Openvpn-users] Multiple Windows clients to a Linux server


  • Subject: Re: [Openvpn-users] Multiple Windows clients to a Linux server
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Mon, 5 Jan 2004 18:50:24 -0000

Raymond <support@xxxxxxxxxxxxxxxxxxxx> said:

> >> .. the other taps had to be on completely separate network <<
> 
> If utilizing bridging, are the separate subnets for every tunnel still
> required?

No, when bridging you must use the same subnet for each tunnel.

When NOT bridging, you must use a different subnet for each tunnel.

OpenVPN doesn't implement bridging directly -- it depends on kernel support. 
For example with linux you would use the brctl tool and with Windows XP you
would select the adapters to be bridged with the mouse and select "bridging"
from the right-click menu.

> Wouldn't this defeat a primary attribute of bridging: broadcasting?

Yes, using the same subnet for every tunnel is necessary for broadcasts to
work.  It is also the reason why ethernet bridging is less scalable than using
a multiple subnet, non-bridging approach because every broadcast must be
duplicated and sent through every tunnel which is participating in the bridge.

James




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