DHCID messages

Leroy Tennison leroy at datavoiceint.com
Tue Aug 14 21:12:33 UTC 2018

I am getting a number of messages about "Forward map from <DNS name> to <IP adress> FAILED: Has an address record but no DHCID, not mine.  In the logs I'm seeing these messages prior to this:

"updating zone '<DNS zone for above name>/IN': update unsuccessful: <DNS name>: 'name not in use' prerequisite not satisfied (YXDOMAIN)" - using named-compilezone with -j I'm seeing that both an A and TXT record exist (we are using  interim as the ddns-update-style).


"updating zone '<DNS zone for above name>/IN': update unsuccessful: <DNS name>/TXT: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET)".

As best as I can tell, what is happening is the client is moving from a wired connection to a WiFi connection (for meetings) or vice versa.  Initially I was looking for a way to make the MAC address rather than the system name the unique identifier for the system then I came across the update-conflict-detection parameter.

Am I understanding the description correctly, if this parameter is set to off and the client "changes MAC addresses" (due to a switch to/from WiFi) then the dhcp server will remove the previous DDNS entry and replace it with the current one?  Are there disadvantages to doing this?

If that isn't the way to handle this situation, how can I make the MAC address (rather than the system name) the unique identifier for DDNS?

Thanks for your help.

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Leroy Tennison
Network Information/Cyber Security Specialist
E: leroy at datavoiceint.com
2220 Bush Dr
McKinney, Texas
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