Incrementing and Changing the Serial Number
Zone serial numbers are just numbers — they are not
date-related. However, many people set them to a number that
represents a date, usually of the form YYYYMMDDRR.
Occasionally they make a mistake and set the serial number to a
date in the future, then try to correct it by setting
it to the current date. This causes problems because
serial numbers are used to indicate that a zone has been
updated. If the serial number on the secondary server is
lower than the serial number on the primary, the secondary
server attempts to update its copy of the zone.
Setting the serial number to a lower number on the primary
server than the one on the secondary server means that the secondary will not perform
updates to its copy of the zone.
The solution to this is to add 2147483647 (2^31-1) to the
number, reload the zone and make sure all secondaries have updated to
the new zone serial number, then reset it to the desired number
and reload the zone again.
The BIND-users mailing list, at https://lists.isc.org/mailman/listinfo/bind-users,
is an excellent resource for peer user support. In addition, ISC maintains a
Knowledgebase of helpful articles at https://kb.isc.org.
Internet Systems Consortium
(ISC) offers annual
support agreements for BIND9, ISC DHCP, and Kea DHCP.
All paid support contracts include advance security notifications; some levels include
service level agreements (SLAs), premium software features, and increased priority on bug fixes
and feature requests.
Please contact
info@isc.org or visit
https://www.isc.org/contact/
for more information.