Bind 8 special characters

Cricket Liu cricket at acmebw.com
Thu Dec 30 22:40:13 UTC 1999


> Later versions of BIND check that host names are compliant with RFC 952.
>
> Underscores are not allowed in host name record unless they are in CNAMEs.

Actually, it's even a little more subtle than that.  An underscore may be
legal in an alias for some query types, and illegal for others.  For
example,
in

foo_foo    in    cname    bar
bar    in    a    10.0.0.1
bar    in    txt    "Comment"

For an address query, foo_foo is an illegal owner name.  For a TXT
query, foo_foo is legal.

> Hyphens are allowed in host names provided the hyphen is not the last
> character.

Hyphens are allowed in the labels of domain names as long as they're
not the first of last character of the label.

cricket

Acme Byte & Wire
cricket at acmebw.com
www.acmebw.com

Attend the next Internet Software Consortium/Acme Byte & Wire
DNS and BIND class!  See www.acmebw.com/training.htm for
the schedule and to register for upcoming classes.




More information about the bind-users mailing list