A multi-interfaced node is connected to multiple networks, some of
which may be utilizing private DNS namespaces. A node commonly
receives DNS server configuration information from all connected
networks. Some of the DNS servers may have information about
namespaces other servers do not have. When a multi-interfaced node
needs to utilize DNS, the node has to choose which of the servers
to contact to. This document describes DHCPv4 and DHCPv6 options
that can be used to configure nodes with information required to
perform informed DNS server selection decisions.
Working Group Summary
There was no controversy about this document, but there were fears
that this document is actually “promoting use of split-brain
DNS”. After discussions the concern was tackled in Section 7
“Considerations for network administrators” with text: ”Private
namespaces MUST be globally unique in order to keep DNS unambiguous
and henceforth avoiding caching related issues and destination
selection problems (see Section 2.3).”
Another major area that caused lots of discussion was security
implications caused by risks related to attacker redirecting some
DNS queries to bad places. This is addressed in Section 4.4.
“Limitations on use” and in Section 4.1, especially with help of
There are two implementations of the protocol, one from Nokia, the
other from NTT. Microsoft also has Name Resolution Policy Table
implementation. There were thorough reviews of the document, but
these reviews did not lead to important changes. There are no
Hui Deng <firstname.lastname@example.org> is the document shepherd.
Ralph Droms <email@example.com> is the responsible AD.