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Re: [dnsext] SRV and wildcard CNAME

Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> Mon, 21 February 2011 04:46 UTC

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Date: Mon, 21 Feb 2011 13:46:08 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
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To: Phillip Hallam-Baker <hallam@gmail.com>
References: <20110216032120.43474.qmail@joyce.lan> <alpine.LSU.2.00.1102161143180.5244@hermes-1.csi.cam.ac.uk> <20110216212930.57D64A3F344@drugs.dv.isc.org> <4D5D24F3.70206@gis.net> <20110217231720.1FCF3A49096@drugs.dv.isc.org> <4D5E08E4.8060106@necom830.hpcl.titech.ac.jp> <AANLkTikjBvndD91q1jQeU9Q45qZyJbBs8t_wZkFezSfa@mail.gmail.com> <4D61B702.7060902@necom830.hpcl.titech.ac.jp> <20110221011731.F0FE0A6B00F@drugs.dv.isc.org> <4D61C45E.7000506@necom830.hpcl.titech.ac.jp> <20110221022950.BE88CA6B2DD@drugs.dv.isc.org> <4D61D194.9040804@necom830.hpcl.titech.ac.jp> <4D61D350.9040401@maxqe.com> <4D61E272.1050600@necom830.hpcl.titech.ac.jp> <AANLkTik8YQYd82vYt6A_j+gDBBSmntju+xh5BQeTX+H5@mail.gmail.com>
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Subject: Re: [dnsext] SRV and wildcard CNAME
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Phillip Hallam-Baker wrote:

>>> When the protocols used at the domain are http and https only,
>>> nothing break.

> Mark is quite correct here.

Neither your example "_null._random.example.com" nor Mark's
example "_foo._tcp.bar.example.com" is applicable to the case
of "protocols used at the domain are http and https only",
because you are assuming protocols "null" or "foo" is used
at the domain.

> In other words the domain is advertising
> services it does not support, this is a failure for a discovery mechanism.

That's fine.

Lazy users do not mind if they advertise non existent services.

Moreover, your statement has nothing to do with Mark's unfounded
statement:

	It breaks *all* protocols that use SRV.

						Masataka Ohta
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