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nYou can use TSIG or SIG0 to protect your dynamic updates
uDetailed howto at: Secure dynamic update HOWTO on ops.ietf.org

nSteps for TSIG dynamic update of forward tree:
uConfigure your TSIG key into /etc/dhclient.conf and specify the FQDN

uConfigure named.conf  to allow updates using the key
Using TSIG to protect dynamic updates