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1. Principle

1.1 Who do what

The information is not copied by the primary, but instead is pulled by the secondaries. The rules are set by the primary though (See the section about secondaries requirements in the primary specification screen).

In clear, the secondary DNS administrator has to tell his DNS to act as a secondary for a given domain, but the primary DNS will tell it how!

1.2 Serial number

The secondary will talk regularly (as told by the primary) to the primary and check the serial number (revision number) of the domain. If the serial number is the same as the copy we have, or is smaller, no copy will be made.

A common error is to forget to update the serial number (SOA record). Secondary won't copy the new information and this may lead to strange behavior. Linuxconf manage serial numbers automatically!


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