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/usr/share/doc/oidentd/README.Debian is in oidentd 2.0.8-4.

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Documentation:
==============

Rick Dicaire <kritek@gmail.com> discovered, that by default if ipv4 and ipv6
addresses for an interface are present, oidentd only uses the ipv4 address. 

A workaround is to set /proc/sys/net/ipv6/bindv6only to 1 according to
http://www.kernel.org/doc/man-pages/online/pages/man7/ipv6.7.html