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

Steven McCoy steven.mccoy at miru.hk
Wed Oct 20 04:41:47 CEST 2010

On 20 October 2010 10:29, Steven McCoy <steven.mccoy at miru.hk> wrote:

> That's a lot of groups.  Most hardware and operating systems only support
> 20, plus there is a common problem with groups on the same port.  I would
> follow TIBCO's recommendation and only use unique ports, i.e.
>,, etc.
The exact value is set by IP_MAX_MEMBERSHIPS which can be found on Linux in
/usr/include/bits/in.h.  Although this explicitly for groups on one
socket, as such in OpenPGM you will get an error trying assign more than 20
groups to one transport.

Modern BSDs have bumped this to 4095 for larger scaling of OSPF, but I've
certainly seen and swapped out hardware that only supports 2.

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