Wildcards

[Mark_Andrews at isc.org]

> Mark_Andrews at isc.org wrote in <aa7fhl$6ji at pub3.rc.vix.com>:
> 
> >...
> >     Well many people don't actually understand how wildcards
> >     work.
> 
> Maybe I'm one of them, because:
> 
> >     Like the expect adding "* MX 0
> >     mail-server.example.com." will add a MX record for every name
> >     in the zone.  It doesn't.  It only add MX records for names
> >     that don't exist in the zone. 
> 
> I didn't understand this to be quite true.  Won't a wildcard match a 
> specific query for its type, even when the queried name owns records 
> with different types?

	No.  This a common trap for new players.  This is one of the
	reasons why we say don't use them.
 
> If so, there would only be a problem if the MTA doesn't do an 
> explicit MX query after failing to get an MX record in response to an 
> ANY query.  And ISTM such an MTA would be broken unless the ANY 
> response was authoritative, and in most (but not all) cases it 
> shouldn't be.

> 
> - Fred
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org