| · | Name of primary DNS server
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| The domain name of the primary DNS server for the zone.
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| The zone should contain a matching NS-record.
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| · | E-mail address of responsible person
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| The e-mail address of the person responsible for the zone.
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| The standard for this is the "hostmaster" user name - such as "hostmaster@simpledns.com".
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| · | Serial number (see Zone Transfers)
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| Used by secondary DNS servers to check if the zone has changed.
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| If the serial number is higher than what the secondary server has, a zone transfer will be initiated.
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| This number is automatically increased by Simple DNS Plus when changes are made to the zone or its records (but not until you click the Refresh button, when another zone is selected, or when the "Edit DNS Records" window is closed).
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| Unless you have a specific reason for changing this number, it is best to let Simple DNS Plus manage it.
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| You should never decrease a serial number.
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| · | Refresh Interval (see Zone Transfers)
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| How often secondary DNS servers should check if changes are made to the zone.
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| · | Retry Interval (see Zone Transfers)
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| How often secondary DNS server should retry checking if changes are made - if the first refresh fails.
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| · | Expire Interval (see Zone Transfers)
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| How long the zone will be valid after a refresh.
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| Secondary servers will discard the zone if no refresh could be made within this interval.
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| · | Minimum (default) TTL
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| Used as the default TTL for new records created within the zone.
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| Also used by other DNS server to cache negative responses (such as record does not exist etc.).
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