Are underscores no longer supported in Bind 9.4?
Mark_Andrews at isc.org
Thu Mar 1 05:37:54 UTC 2007
> Bill Larson wrote, on 01. mar 2007 04:54:
> >> Haven't begun with 9.4 yet, but shall do shortly. Are underscores
> >> permitted in TXT records? I'm thinking of things like Kerberos and
> >> Domainkeys/DKIM TXT records.
> > Come on, there is a difference between "hostnames" with an "A" record
> > and "TXT" records. This is an argument from the early BIND-8 days. At
> > least seven years old.
> > Please, if you are managing a DNS operation, maybe for Kerberos, you
> > need to understand the DNS that you are managing. Do a little
> > studying. (You have the exact same issue with "SRV" records used by
> > Microsoft Active Directory also. The AD records/domains specifically
> > include underscore characters.)
> Possibly. Keep things on the list, if you please.
> Tony Earnshaw
> Email: tonni at hetnet dot nl
Kerberos uses _kerberos specifically because _kerberos is
not a legal label in a hostname. You can then have a host
called kerberos without it clashing the TXT record specifying
the Kerberos realm.
kerberos.example.com A 18.104.22.168
_kerberos.example.com TXT EXAMPLE.COM
Similarly for SRV, using underscore moves the records out of
the hostname space.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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