[AG-TECH] Unicast-Multicast bridges?

Randy Groves randy.groves at boeing.com
Tue Jan 22 09:36:29 CST 2002

We have multicast within Boeing, but not, as far as I know, between Boeing 
and the real world.  I'm interested in bridging facilities for possible 
support of areas in Boeing that are not yet set up with multicast.

Thanks!  I'll take a look.


At 09:05 PM 1/21/2002 -0600, Stuart Levy wrote:
>I have a simple one at
>    http://niri.ncsa.uiuc.edu/tools/udpbridge.tar.gz
>You specify the port-pairs that it should forward on.
>And there's no security (though there's a code stub for
>an access list).  Anyone who sends a unicast packet, at least
>one per two minutes, to the bridge on either port of a port-pair
>will get all traffic on that port-pair.
>One bridge can forward several port-pairs.  E.g.
>    udpbridge -p 8666    -p 6822
>The "-p NNNN" listens on that odd-even unicast port pair, and
>mcastaddr/port/ttl does likewise for that multicast address/port-pair.
>It would need to run on a machine that had multicast access;
>is it true that you don't (or won't) have that anywhere in Boeing?
>It'd also need to run on a machine that wasn't using any of those
>ports for other applications, so it couldn't be on an AG machine itself.
>And, I've never used this in the high-traffic AG environment;
>it doesn't seem to take any noticeable CPU time when forwarding 100-odd
>packets per second (~1% CPU at 50 pps input, 150 output), but
>your mileage may well vary...
>     Stuart

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