Fwd: Dynamic DNS/DHCP

Glenn Satchell Glenn.Satchell at uniq.com.au
Mon Apr 21 15:09:27 UTC 2008

That's correct in the simple case.

You could work your way through the source to see how it calculates the
value that gets placed in the corresponding TXT record and then
manually create all of those, but it would be a non-trivial exercise
even for a small network.

This is all covered in the dhcpd.conf man page in the section titled


>Date: Mon, 21 Apr 2008 07:47:45 -0700 (PDT)
>From: frank miller <frankkmiller at yahoo.com>
>So you can't deploy DynDNS where you already have DNS
>entries without deleting them all ??
>> Probably the best way to get around this is to
>> delete the existing A
>> record from DNS, then let dhcpd dynamically add it's
>> own records.
>> Doing a release and renew on the client should be
>> enough to force the
>> DNS update.
>> For forward records it adds the A record, plus a TXT
>> record which
>> contains a hash of various identifiers (the DHCID)
>> so that dhcpd can be
>> sure that next time it's updating a record that it
>> put into the DNS
>> zone. The idea is to stop someone naming their PC
>> with the same name as
>> an existing system, such as your Very Important
>> Server, and modifying
>> the DNS entry.
>> regards,
>> -glenn
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