Brian A. Seklecki writes:
It's right in the man page:
MIB Variables
A number of variables are implemented in the net.inet6 branch of the
sysctl(3) MIB
[...snip...]
IPV6CTL_V6ONLY (ip6.v6only) Boolean: enable/disable the prohib-
ited use of IPv4 mapped address on AF_INET6 sock-
ets. Defaults to on.
Where we lack in strace(1), we make up for extremely well documented
userland and kernel subsystems.
And that's precisely why Courier cannot talk to IPv4 peers when this option is turned on.
Since IPv4-mapped addresses are explicitly documented as part of the IPv6 socket API (RFC 3493), this kernel option is of a rather dubious value. It intentionally disables the IPv4-interoperability of IPv6 clients.
It's like having a kernel option that blocks anyone from connecting to any port below 1024, and defaulting it to on.
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