PowerDNS/pdns — pull request #1129 by mzealey (2013-12-02 08:26:10+00:00)
Title: This patch allows user to specify that socket binding can fail. On IPv4 ...

...there

is a ip_nonlocal_bind sysctl that can be set, however for IPv6 there is not
this call and it is unlikely to be implemented kernel-side.

Fixes PowerDNS/pdns#344