[Vtun-Users] Can Vtun tunnel Ethernet traffic with just 1 NIC card?

[Barnes, J. <JB...@rg...>]

I want to connect two LANS via Vtun.  But I want to only have 1 NIC card in
the Linux box on each side.  Is this possible?  It would mean that the NIC
card would both need to be in promiscuous mode and also send traffic out
over the socket tunnel.

I want this to work at a Ethernet level.  I basically want a long distance
bridge.  Also if anyone could point me to instructions on how to do this and
a config file I would appreciate it.  I have read through everything I can
find including the entire vtun-users archive.  

One thing that has confused me is I have read that I should enable Linux
bridging.  This surprises me because I thought that software was for  doing
traditional NIC card to NIC card bridging.  Basically sending the traffic
over the PC bus.  In my case it is architecturally like bridging but  VTUN
is really doing the bridging.  So I don't understand why I would use the
Linux bridging software.  

How I think it should work:

-   Create TAP device that maps to a physical Ethernet.
-   Have either the TAP or physical Ethernet device, not clear to me, put in
promiscuous mode
-   Configure VTUN to tell it where to point to.  An IP address on the other
system.  I assume I don't have any routes or anything else.  Just use
regular routes that my system already has for normal Internet traffic.
-  VTUN then reads all Ethernet traffic off of TAP and sends over the wire.
And vice versa.

I don't fully understand if I will have any TUN devices.  Is the TUN device
the user interface into the tunnel to the other system?  It would seem that
VTUN would just use a normal socket to do this.  So I am guessing that I
would not have any TUN devices.  But I don't know.

Thanks a ton.

-Jym-