[dns-operations] about the underline in hostname

Paul Vixie paul at redbarn.org
Fri May 30 02:05:46 UTC 2014

hua peng wrote:
> IIRC BIND doesn't permit an A record whose label has a underscore
> included, for example, this one:
> aa_bb.google.com.         300     IN      A

try this in your named.conf file:

options {
    check-names master ignore;
    check-names slave ignore;
    check-names response ignore;

> what RFC item is it influenced by?

none. the author of bind 4.9 woke up some time in 1996, naked in a ditch
outside Albuquerque, with song about "check-names" stuck in his head for
some crazy reason. he apologizes for the joke, and has requested the
removal of this feature from BIND9.


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