Tunneling in Ubuntu

Smoot Carl-Mitchell smoot at tic.com
Wed Feb 3 22:21:57 UTC 2010

On Wed, 2010-02-03 at 22:40 +0100, Werner Schram wrote:
> On Wed, Feb 3, 2010 at 7:02 AM, Nazeem نجم لدين <nazeemnss at gmail.com> wrote:
> >
> > hi,
> > Can you suggest way of getting a multicast tunnel work. The assumption is
> > that there is a unicast cloud in between two mbone networks. So we need to
> > forward the multicast traffic over the unicast tunnel. Application is for
> > video transmission.
> > -Nazeem
> >
> I think you should be able to do it with openvpn. Using the tap setup, 
> you can create a OSI layer 2 tunnel, which should be able to handle 
> ip-multicast. You then need to update the routing tables in both 
> networks to send multicast traffic to the tunnel in stead of the router. 
> If you fully thrust the connection between the two networks, you could 
> disable openvpn's encryption for better performance.

You can also do this with SSH which I find simpler than openvpn to
configure (although I have done both).  Check out the -w argument to SSH
and the 'Tunnel' configuration parameter.  Tunnel lets you do either
layer 3 (point-to-point) or layer 2 (ethernet).  You do incur the
encryption overhead, but I would not run a VPN connection over the
Internet unencrypted.

Smoot Carl-Mitchell
Computer Systems and
Network Consultant
smoot at tic.com
+1 480 922 7313
cell: +1 602 421 9005

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