Does "@" in CNAME record not work?

[Joseph S D Yao]

On Fri, Jul 13, 2001 at 12:05:49AM +0000, Jim Lum wrote:
> >         mydomain.com            SOA ...
> >         mydomain.com            NS ns1.mydomain.com
> >         mydomain.com            A 192.168.0.4  ; must be an A record
> >         ns1.mydomain.com        A 192.168.0.4  ; must be an A record
> >         www.mydomain.com        CNAME mydomain.com

I didn't even notice that one of those names was "ns1".  Certainly, if
it is the object of an NS record, it must be an A record rather than a
CNAME!

> Doesn't that bring me back to the problem pointed out in the Bind/DNS
> book (3rd edition, pgs. 64-65)?

There is a problem mentioned on pp. 63-64 of 3E that has to do with TWO
ADDRESSES for ONE NAME - not TWO NAMES for ONE ADDRESS.  The discussion
ends on pp. 64-65 with a problem specific to the 'sendmail' program and
figuring out "the" canonical name.  This is not your problem.

With the DNS protocol as currently defined, you must use two A records.
I would comment both instances to remind people that if one changes,
they should consider changing the other.  Even if "people" is just you,
nobody corporeal has infinite memory capacity [you might forget].

-- 
Joe Yao				jsdy at cospo.osis.gov - Joseph S. D. Yao
OSIS Center Computer Support					EMT-B
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