Thank you…this is very useful information; I thought TTL could only be specified on a per-zone basis, not per-host.
On Jun 25, 2021, at 11:10 AM, Richard T.A. Neal <rich...@richardneal.com<mailto:rich...@richardneal.com>> wrote: Hi Bruce, Here you're specifying a distinct TTL for those records which overrides the default TTL for this zone (which you will have set towards the top of the file with the rest of the defaults) 1m = 60 seconds: https://web.mit.edu/rhel-doc/5/RHEL-5-manual/Deployment_Guide-en-US/s1-bind-zone.html So you're essentially telling DNS clients that the value provided for mail.{your-fqdn} is only valid for 60 seconds. As you say, a cheap load balancing attempt! Best, Richard. -----Original Message----- From: bind-users <bind-users-boun...@lists.isc.org> On Behalf Of Bruce Johnson Sent: 25 June 2021 6:56 pm To: bind-users@lists.isc.org Subject: Odd A record in our hosts zone file I ran across these A records in one of our zone files: ;EXCHANGE STUFF 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 _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs
_______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
