[Kea-users] Kea DDNS - Forward Updates work, but reverse do not?

[Rick Frey]

If I’m reading logs correctly, your BIND nameserver is rejecting the update as the Kea request is requiring NXRRSET (means the record cannot already exist in the nameserver).  I don’t see Kea config option to change that behavior.  By chance did you manually create the PTR record for 74.10.168.192.in-addr.arpa in you BIND zone outside of Kea?  If so, might try removing it.  I don’t have any personal experience w/ Kea updating reverse records but guessing that at least w/ PTR records, Kea will not update if record already exists. 



> On Jan 28, 2024, at 12:51, Ubence Quevedo (thatrat) <thatrat at gmail.com> wrote:
> 
> Thanks for the response, I took a look at the ddns log file I have setup on my bind 9 server and found the following:
> 27-Jan-2024 15:55:15.083 update: info: client @0xffff7c339b18 192.168.10.3#50944/key ddns-key: updating zone 'totusmel.com/IN': deleting an RR at lg-washer.totusmel.com A
> 27-Jan-2024 15:55:15.123 update: info: client @0xffff6c2c4228 192.168.10.3#56549/key ddns-key: updating zone 'totusmel.com/IN': delete all rrsets from name 'lg-washer.totusmel.com'
> 27-Jan-2024 15:55:15.143 update: info: client @0xffff702ec848 192.168.10.3#34817/key ddns-key: updating zone '10.168.192.in-addr.arpa/IN': update unsuccessful: 74.10.168.192.in-addr.arpa/PTR: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET)
> 
> It seems to be the same output as journalctl but through bind’s terminology.
> 
> I’m pretty sure the forward zone is getting updated properly since there’s a .jnl file and the serial number in the zone file is incrementing.
> 
> For some reason, the below section got stripped out in the response:
> The relevant section from the kea-dhcp4.conf:
>     "dhcp-ddns": {
>       "enable-updates": true
>     }
>         "ddns-qualifying-suffix": "totusmel.com <http://totusmel.com/>",
>         "ddns-override-client-update": true,
> 
> Do I also need to add reverse zone 10.168.192.in-addr.arpa to the kea-dhcp4.conf?
> 
> Any other thoughts or comments on this would be appreciated!
> 
> -Ubence
> 

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