On Thu, Apr 26, 2018 at 09:23:13AM +0100, Luca Boccassi wrote: > On Thu, 2018-04-26 at 10:00 +0200, Lionel Flandrin wrote: > > Hello everyone, > > > > I'm trying to build a multicast protocol on top of an IPv6-only > > network. I found that the draft RADIO/DISH sockets seem to do exactly > > what I want, however the zmq_udp man page doesn't explicitely mention > > supporting IPv6 multicast and I couldn't get pyzmq to bind an IPv6 > > multicast DISH with any URL format I've tried. > > > > Is IPv6 multicast simply currently unsupported for UDP sockets? If > > that's the case is it because of a technical difficulty or simply > > because nobody bothered to implement it? > > > > Thank you for your help (and your great library), > > UDP right now supports only ipv4 - it's a work in progress: > https://github.com/zeromq/libzmq/issues/2891
Ah, I see, thank you for confirming that. Do you think adding IPv6 support would be a huge amount of work for somebody not familiar with ZMQ's codebase? Is it just about adding a few branches changing AF_INET to AF_INET6 or am I being ridiculously naive? My current backup solution if I can't get ZMQ to do what I want is to write my own IPv6 multicast code using BSD sockets directly, if hacking ZMQ's code to add support is not too daunting I could consider doing that instead. > PUB/SUB with PGM or NORM should do what you are looking for. I considered EPGM briefly but the zmq_pgm man page seems to say that only IPv4 is supported, so I didn't even attempt it: A multicast address is specified by an IPv4 multicast address in its numeric representation. Maybe I shoudln't have been so quick to dismiss it, I'm going to give it a try. That being said I don't actually need the guarantees of PGM/NORM, in particular I don't care if a frame gets mangled or dropped and I don't need SNDMORE. Thank you, -- Lionel Flandrin
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