[dns-operations] Recommended zone serial number format for over 100 changes / day

Mukund Sivaraman muks at isc.org
Thu Mar 31 13:20:46 UTC 2016

Hi Jonathan

On Wed, Mar 30, 2016 at 06:56:13PM +0000, Jonathan Tuliani wrote:
> RFC1912 recommends the following SOA serial number format: YYYYMMDDnn
> However, this does not support more than 100 updates per day (whilst
> this sounds like a lot, the fluidity of the Cloud means there are some
> applications where large numbers of changes are commonplace).
> Is there a recommended serial format that supports large numbers of
> changes?

You can use any serial number format that fits in a 32-bit unsigned
integer. There're no restrictions except that care should be taken to
allow for serial number arithmetic to occur correctly when the serial
might overflow.

See RFC 1982 and particularly section 7 in that for how the serial value
should be updated. Overflow of the serial value would not result in
inconsistencies as long as the operator follows the guidelines there.

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