Odd A record in our hosts zone file

Eric Germann ekgermann at semperen.com
Fri Jun 25 18:13:18 UTC 2021

Time to live in the cache. Short time to live is useful when you need to change the A record to swing one host to another. 

> On Jun 25, 2021, at 12:56, Bruce Johnson <johnson at pharmacy.arizona.edu> wrote:
> I ran across these A records in one of our zone files:
> mail            1m      IN      A       xxx.xxx.xxx.52; dhbex1
> mail            1m      IN      A       xxx.xxx.xxx.54; dhbex2
> I can see that this is a cheap load-balancing for our exchange OWA servers, but what is the ‘1m’ notation? I haven’t been able to find that in my searching of the manual.
> (We’re adding new servers and I need to make sure our DNS is properly set for them.)
> -- 
> Bruce Johnson
> University of Arizona
> College of Pharmacy
> Information Technology Group
> Institutions do not have opinions, merely customs
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