[Bridge] Building a Raw Bridge

Michael Boutte maboutte at pacbell.net
Fri Apr 10 22:56:56 PDT 2009

I'm having trouble figuring out how to make a bridge that does not block 
forwarding of packets when there is no receive channel in the same 
bridge. The reason I want to do this is that the return path is via 
another circuit. The two directions are on two different radios. I would 
think this would be like the response given to someone in July 2007 
about setting a "hub" mode by setting the aging timer to 0. I tried that 
and it did not work.

I also tried a few schemes with ebtables without success either. Is 
there some relatively easy way to make the bridge forward everything and 
not cut off the transmit after a single packet?

/ Here is what one end of the link looks like.
//                   +-------------+
// ///      /// + eth0 +---+   bridge 1  +---+ wan0 ---> Transmit
//        |          +-------------+ 
//        |                          
//        |          +-------------+ 
//        + eth0 +---+   bridge 2  +---+ wan0 <--- Receive
//                   +-------------+
The WAN side uses a synchronous serial interface to the radios for 
satellite communications. The other end uses a single radio and bridge.

Mike Boutte

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