[zeromq-dev] EPGM packets

Martin Sustrik sustrik at 250bpm.com
Fri Feb 3 11:59:46 CET 2012

Hi Matteo,

> we just switched our PUB/SUB architecture on 0MQ from TCP to EPGM to
> reduce traffic and get over the need for a central repeater to have
> multiple publisher/multiple subscribers.
> I tcpdump'ed the traffic to see what was going on, but I can only see
> repeated multicast messages from the publisher, but nothing from the
> subscribers. Is that normal? Is that because of UDP encapsulation?

Yes. It's normal. Subscribers complain only if there's packet loss on 
the network.

For more details check RFC 3208


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