[zeromq-dev] Does ZMQ "Over Send" Using OpenPGM

Steven McCoy steven.mccoy at miru.hk
Wed Oct 20 15:59:27 CEST 2010

On 20 October 2010 21:25, Martin Sustrik <sustrik at 250bpm.com> wrote:

> 2. When checking the packets via wireshark (monitoring lo interface) both
> source and destination IP are set to my eth0 interface address. The
> multicast group is nowhere to be seen.
Sounds like something fruity with your kernel, you may also see 0 checksums.

PGM doesn't care about multicast groups you could theoretically bond
multiple groups together on one transport, or use both IPv4 and IPv6.

It's also why things like asymmetric multicast can work, however in ZeroMQ
there is no bus transport and so it gives pretty much zero benefit.  The
only packet types affected are peer multicast SPM-Requests, which I've just
noted are sent to the send group and not the receive groups.  In the future
peer multicast NAKs would be affected too, but we don't have a DLR yet.

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