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

"John R Levine" <johnl@taugh.com> Tue, 09 February 2010 17:10 UTC

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From: "John R Levine" <johnl@taugh.com>
To: "Dave CROCKER" <dcrocker@bbiw.net>
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References: <20100209012039.98092.qmail@simone.iecc.com> <4B70BCCB.5020405@dcrocker.net> <alpine.BSF.2.00.1002082110250.10191@simone.lan> <4B717F89.9060901@dcrocker.net> <alpine.BSF.2.00.1002091121080.5333@simone.lan> <4B719287.1000708@bbiw.net>
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Cc: Anti Spam Research Group <asrg@irtf.org>
Subject: Re: [Asrg] DNS basics, was overloading server names doesn't work
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>>>>>> mail.btinternet.com. 600 IN CNAME pop-smtp.bt.mail.yahoo.com.
>>>>>> pop-smtp.bt.mail.yahoo.com. 1800 IN CNAME
>>>>>> pop-smtp.bt.mail.fy5.b.yahoo.com.
>>>>>> pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.12.13.134
>>>>>> pop-smtp.bt.mail.fy5.b.yahoo.com. 300 IN A 217.146.188.192

>>>>> _report.pop-smtp.bt.mail.fy5.b.yahoo.com IN TXT abuse-report@yahoo.com
>>>> 
>>>> 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?

>> 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.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
"I dropped the toothpaste", said Tom, crestfallenly.