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Re: [Nmh-workers] [OT] Strange DNS for cyrus.andrew.cmu.edu was: IMAP/nm
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From: |
Ken Hornstein |
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Subject: |
Re: [Nmh-workers] [OT] Strange DNS for cyrus.andrew.cmu.edu was: IMAP/nmh, again |
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Date: |
Thu, 26 Oct 2017 22:42:12 -0400 |
>Thus said Ken Hornstein on Thu, 26 Oct 2017 14:22:37 -0400:
>But the A record for that name is only 1 second... strange:
>
>$ dnsqr a cyrus.andrew.cmu.edu
>1 cyrus.andrew.cmu.edu:
>86 bytes, 1+3+0+0 records, response, noerror
>query: 1 cyrus.andrew.cmu.edu
>answer: cyrus.andrew.cmu.edu 1 A 128.2.158.26
>answer: cyrus.andrew.cmu.edu 1 A 128.2.105.45
>answer: cyrus.andrew.cmu.edu 1 A 128.2.158.29
>
>I wonder what the purpose of such a configuration might be.
I suspect they wanted to provide high reliability and have clients fall
over to one of the other servers quickly. But even Google has a TTL
of 300 seconds for imap.gmail.com.
--Ken