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Every update request consists of zero or more prerequisites and zero or more updates.
This allows a suitably authenticated update request to proceed if some specified resource records are present or missing from the zone.
For instance suitable key and server statements would be added to /etc/so that the name server can associate the appropriate secret key and algorithm with the IP address of the client application that will be using TSIG authentication. nsupdate uses the -y or -k option to provide the shared secret needed to generate a TSIG record for authenticating Dynamic DNS update requests. With the -k option, nsupdate reads the shared secret from the file keyfile, whose name is of the form K. By default nsupdate uses UDP to send update requests to the name server. This may be preferable when a batch of update requests is made.
nsupdate reads input from filename or standard input.
port is the port number on servername where the dynamic update requests get sent.
This set of RRs must exactly match the set of RRs existing in the zone at the given type, class, and domain-name.This allows resource records to be added or removed from a zone without manually editing the zone file.A single update request can contain requests to add or remove more than one resource record.These conditions must be met if the entire update request is to succeed.Updates will be rejected if the tests for the prerequisite conditions fail.