Is there any way to set up a group of interfaces so that broadcast
packets are forwarded between them?  I want them all to (logically)
appear to all be on the same subnet.

I have a linux machine which I want to act as a PPP dial-in box, and I
would like the various clients (ppp0, ppp1, ppp2) to be able to send
broadcasts that will go to all the interfaces.  Essentially, I want to
bridge these interfaces together, but I believe the bridging code works
at layer 2, which IIRC will not work correctly for PPP interfaces.

The normal packet forwarding code is sufficient to forward anything that
is a unicast packet.

-- 
-Ben Carter
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the experience of others, are also remarkable for their apparent
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