udp/mcast: use group scopeid as interface for IPv6

baresip / re

Generic library for real-time communications with async IO support

BSD 3-Clause "New" or "Revised" License

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udp/mcast: use group scopeid as interface for IPv6 #1149

Closed maximilianfridrich closed 2 months ago

maximilianfridrich commented 2 months ago

For IPv6 (link-local) the interface must be selected when sending packets. Otherwise, udp_setsockopt() results in an ICMPv6 packet being sent with the source IP being :: which results in IPv6 multicast not working.