How to check slave zone freshness

Barry Margolin barmar at
Tue Feb 9 16:06:04 UTC 2016

In article <mailman.193.1455032305.73610.bind-users at>,
 Klaus Darilion <klaus.mailinglists at> wrote:

> On 08.02.2016 20:49, Mark Andrews wrote:
> > With a modern nameserver that supports the expire edns option you can
> > also do "dig +expire soa zone @server" which will tell you how long
> > until the zone will expire on this server.
> Aha, but isn't this a different kind of information? A zone which is not
> fresh anymore (refresh interval expired and checks to the master failed)
> may still be valid (not expired yet).

Subtract the time until expiry from the SOA Expire field, and that tells 
you how long it has been since it last refreshed.

Barry Margolin
Arlington, MA

More information about the bind-users mailing list