Comment 3 for bug 1595993

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Zygmunt Krynicki (zyga) wrote : Re: go binary (spread) uses bind on startup, requiring network-bind

And in addition this:

// BUG(rsc,mikio): On DragonFly BSD and OpenBSD, listening on the
// "tcp" and "udp" networks does not listen for both IPv4 and IPv6
// connections. This is due to the fact that IPv4 traffic will not be
// routed to an IPv6 socket - two separate sockets are required if
// both address families are to be supported.
// See inet6(4) for details.

func probeIPv4Stack() bool {
...
}