need help with dynamic DNS updates

David W. Hankins David_Hankins at
Fri Mar 10 17:56:48 UTC 2006

if the client does not send a hostname, you will need to supply one.

'man dhcpd.conf' says:

       The DHCP server determines the client’s hostname by first looking for a
       ddns‐hostname  configuration  option,  and using that if it is present.
       If no such option is present, the server looks for a valid hostname  in
       the  FQDN option sent by the client.  If one is found, it is used; oth‐
       erwise, if the client sent a host‐name option, that  is  used.   Other‐
       wise,  if  there  is a host declaration that applies to the client, the
       name from that declaration will be used.  If none of these applies, the
       server will not have a hostname for the client, and will not be able to
       do a DNS update.

David W. Hankins		"If you don't do it right the first time,
Software Engineer			you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins

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