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
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