server: Fix IPv6 dual stack mode issue for udp socket. fix #2768 #2781
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Signed-off-by: Masahiro Nakagawa [email protected]
Which issue(s) this PR fixes:
Fixes #2768
What this PR does / why we need it:
Set
IPV6_V6ONLY
to udp socket.Docs Changes:
No need
Release Note:
Same at title.