CNAME for domain.com?
Mark_Andrews at isc.org
Thu Feb 9 21:37:35 UTC 2006
Why did you post this twice?
Message-ID: <43EB81DB.4090800 at francis.mmwds.com>
Message-ID: <43EB7932.9000406 at francis.mmwds.com>
> I have several domains that point to my machine at home on my
> Comcast cable connection which has a name pointed at it through
> DynDNS.org. I want to CNAME records in the zone files for the domains
> that point to my machine, which is not a problem for domains where I
> have a hostname (i.e. www.mydomain.com, mail.mydomain.com, etc.), but I
> also want to point mydomain.com at my dyndns.org name rather than making
> it an A record pointing at the IP of my machine. However, I can't use a
> CNAME to do this. Is there an easy way to point mydomain.com (without a
> hostname) at my dyndns.org name as a CNAME, or does it have to be an A
> record pointing at an IP?
Talk to the WC3 forum and get SRV support into browsers.
What you want to do is not allowed by the DNS protocol.
The domain system provides such a feature using the canonical name
(CNAME) RR. A CNAME RR identifies its owner name as an alias, and
specifies the corresponding canonical name in the RDATA section of the
RR. If a CNAME RR is present at a node, no other data should be
present; this ensures that the data for a canonical name and its aliases
cannot be different. This rule also insures that a cached CNAME can be
used without checking with an authoritative server for other RR types.
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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