good address will not resolve in freebsd (_ in host names)

[Kevin Oberman]

Here we go again.

RFC2181 states a requirement for DNS servers, not resolvers. It states
that it is the responsibility of the resolver to decide what is
acceptable and what is not. The server just does its best to respond
to an query with the data it has (which may be binary, as well as
ASCII).

The question of whether the FreeBSD resolver should police requests is
less clear. The prime concern has been security issues when a program
gets back a response that is not allowed under the RFCs. I know some
obvious issues with some characters in host names, but none that
involve underscore. But they may well exist.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634