This value is the largest source of errors and problems with DNS. To make things fast and efficient processing BIND zone files to another format. When you load a BIND zone file at the start, check the serial number and only processes the zone file if the serial number is greater than the version previously processed.

Therefore, if you make changes to the zone file, but not the serial number, BIND ignored and not made the changes.

A common format for the serial number contains only a date and serial number (YYYYMMDDNN), such as 2009011502 for the second review (02) of the record of 15 January 2009. This allows changes to the 100 serial number of the DNS in a day.

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