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Re: [Asrg] DNS basics, was overloading server names doesn't work

2010-02-09 12:35:19


On 2/9/2010 9:11 AM, John R Levine wrote:
Nope, that won't work. CNAMEs don't do a partial match.

Where did I or anyone else specify a partial match?

The user thinks his POP server is called mail.btinternet.com. When he
looks up _report.mail.btinternet.com, what do you expect to happen?

He'll get a TXT record back. This is nothing but exactly the same mechanism that is used for DKIM and SRV, albeit with a different underscore subdomain.

The DNS construct of partial matching has nothing to do with this mechanism.


Also 2181. I'll go see if there's a clearer explanation somewhere else.

Normally, something finer-grained that a reference to all of 15 pages
would be expected.

Aw, come on. If you can't find the part about CNAMEs in 10 seconds,
you're not trying.

You are asserting a truth. It's your obligation to substantiate it. A broad reference to a 15-page document does not satisfy that obligation.

I told you I looked for it and could not find it. Rather than berate me, all you have to do to settle the matter is supply the text. From what you say, that's a 10-second exercise.

d/
--

  Dave Crocker
  Brandenburg InternetWorking
  bbiw.net
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