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net: ListenMulticastUDP doesn't work on Solaris #20898
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Multicast UDP listen using net.ListenMulticastUDP fails (Solaris)
Jul 5, 2017
Basically #7399 is unrelated even though the functionality is required for testing. The reason why ListenMulticatsUDP doesn't work (and the external networking library does work well for IP multicasting) is because the solaris port maintainers didn't enable the function when they made the solaris port available.
Simply tweaking build constraint lines in the net and internal/poll packages of the standard library could enable the function on Solaris.