[zeromq-dev] Can't bind same ZMQ_UP/DOWNSTREAM multiple times.

Martin Sustrik sustrik at 250bpm.com
Thu Aug 19 14:19:17 CEST 2010


> Problem is, someone has to bind the address for anyone to be able to 
> talk to it.
> See the attached diagram (sorry for slopping drawing, no mouse :-)
> Circles = endpoints, oblongs = workers.
> Right now, to implement the "mid" endpoint, you either need a device or 
> a device-like concentrator (a worker that binds an address and allows 
> the workers on the right to connect to it, and then forwards messages 
> from the left to the right).
> Which is, essentially, duplicating lots of work.

Binding several sockets to a TCP port to get a multicast delivery is 
something TCP doesn't support. You'll either have to do with a device in 
the middle or use IP multicast (via PGM) which effectively turns your 
switch into the device. Using IP multicast has its own set of problems 


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