Turn off IPV6_V6ONLY on Windows if it is supported #520
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IPV6_V6ONLY refs: https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses https://github.com/golang/go/blob/master/src/net/ipsock_posix.go https://en.wikipedia.org/wiki/Unix-like off: https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html#proc-sys-net-ipv6-variables https://man.netbsd.org/inet6.4 https://man.freebsd.org/cgi/man.cgi?query=inet6 https://github.com/apple-oss-distributions/xnu/blob/main/bsd/man/man4/inet6.4 on: https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options acts like off, but returns 1 and dummy setting: https://man.dragonflybsd.org/?command=inet6 https://man.dragonflybsd.org/?command=ip6 unsupported and read-only returns 1: https://man.openbsd.org/inet6.4 default value refs: https://datatracker.ietf.org/doc/html/rfc3493#section-5.3 https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html#proc-sys-net-ipv6-variables
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It makes support for IPv4-mapped IPv6 addresses.
IPV6_V6ONLY refs:
https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses
https://github.com/golang/go/blob/master/src/net/ipsock_posix.go
https://en.wikipedia.org/wiki/Unix-like
off:
https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html#proc-sys-net-ipv6-variables
https://man.netbsd.org/inet6.4
https://man.freebsd.org/cgi/man.cgi?query=inet6
https://github.com/apple-oss-distributions/xnu/blob/main/bsd/man/man4/inet6.4
on:
https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
acts like off, but returns 1 and dummy setting:
https://man.dragonflybsd.org/?command=inet6
https://man.dragonflybsd.org/?command=ip6
unsupported and read-only returns 1:
https://man.openbsd.org/inet6.4
default value refs:
https://datatracker.ietf.org/doc/html/rfc3493#section-5.3
https://www.kernel.org/doc/html/latest/networking/ip-sysctl.html#proc-sys-net-ipv6-variables