RE: dns_update_log shows dynamic entries deleted

Posted by Cuttler, Brian (HEALTH) on
URL: http://isc-dhcp-users.193.s1.nabble.com/dns-update-log-shows-dynamic-entries-deleted-tp194p200.html

I disabled update_optimization and as dhcp releases are renewed (I already has update_static enabled) we are re-creating the DNS entries.

 

I still have no idea why those entries all got deleted and am rather stressed over it.

 

Please help me to understand what went wrong, and how to prevent or properly fix.

 

Many thanks,

Brian

 

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of Cuttler, Brian (HEALTH)
Sent: Tuesday, June 09, 2015 12:05 PM
To: Users of ISC DHCP
Subject: dns_update_log shows dynamic entries deleted

 

We are running on Centos 7.1 and have dhcp 4.2.5, with bind 9.9.4.

 

We are running dhcp with subnet 10.57.36.0/22 permitted dynamic dns udpates, except for the last 100 addresses in the pool, which we excluded to allow for static addresses that we needed.

 

Things have been working wonderfully – but at 08:18 this morning a large number of entries were removed from dynamic dns.

 

The dhcp clients were either, only asleep for the night (Windows, printers) or actually online (linux).

 

I’ve no idea why these DNS entries were removed, exactly how to get them back, and how to prevent them from being removed again.

 

I’d suspect it was a lease expiration issue, but these machines all check in and renew, at least they should be, I can check the boot.log and see.

 

Thanks for your help,

Brian

 

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