[TriLUG] Understanding Subdomains and Sub-subdomains

[Aaron Joyner]

It's not exposed by dynip.com (eg. you can't ask for it with dig and see
it), but internally the behavior you describe is implemented as a wildcard
DNS record:
http://en.wikipedia.org/wiki/Wildcard_DNS_record
http://tools.ietf.org/html/rfc1034#section-4.3.3

If you can implement a wildcard CNAME for undecidedgames.net via 1and1,
you're all set.  Otherwise, you might need a more advanced hosting solution
(I know nothing of 1and1, but any service which allows you to set * as the
left-hand component, or write a BIND zone file, would suffice).

Best of luck!
Aaron S. Joyner


On Sun, Jun 16, 2013 at 3:51 PM, Brian <lugmail at cheetah.dynip.com> wrote:

> Hi,
>
> This is a question for the DNS gurus in the audience.
>
> I have a dynamic DNS service with dynip.  cheetah.dynip.com points at my
> public IP address.
>
> I can go to anything.cheetah.dynip.com and it resolves to the same
> address, and I don't need to go make any settings with dynip.  It just
> works.  I make heavy use of this for setting up name-based virtual hosts on
> my apache server.
>
> On the other hand, I have a 1and1 domain (with 1and1's DNS service),
> undecidedgames.net, which is a CNAME for cheetah.dynip.com.
>
> I cannot go to anything.undecidedgames.net without first registering the
> subdomain with 1and1.
>
> So I can see an obvious difference; the former has four parts (
> a.cheetah.dynip.com) while the latter has only three (a.undecidedgames.net).
>  Is this just a normal way that DNS works?  Is there an implied *.
> cheetah.dynip.com, but not a *.undecidedgames.net? Or is it because
> undecidedgames.net is a CNAME and not an A record?
>
> If I wanted to have *.undecidedgames.com, would that be (a) advisable or
> (b) possible?  1and1 won't let me put in * as a subdomain name.
>
> Thanks y'all!
> ~Brian
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