Bind updating serial number for zones
I've a BIND9 server with a lot of zones and I need to increase the serial number of the zone files by one.
Normal convention is that the Serial number is the timestamp in date ISO date format followed by a two number increment 2014101501 Microsoft products are set up to autoincrement the Serial Number when changes are made.
So a DNS zone file contains an SOA record specifying the authoritative name server, along with some other information such as a "serial number".
I'm trying to understand the purpose of the serial number.
A notify is deemed valid if the sender is one of the servers in the NS RRset for the zone, has been explicitly allowed using an 'allow-notify' clause, or is from an address listed in the masters' clause.
This seems unintuitive to many when they learn this for the first time, but it vastly simplifies the code/algorithm for handling refreshes on notify and also ensures, by using the same sequence of SOA checks each time, that the slaves will always converge their SOA serial numbers to the most up-to-date version.
When you use a fancy DNS server, which has a database backend for intance, it can compute the serial number automatically (which is usually in the tool from ndu (that tool does not require BIND).
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