KEA DHCP missing "Register DHCP leases in DNS Resolver..."

4o4rh

@johnpoz I must be understanding something different from the statement.
In my NTP Server settings, I use de.pool.ntp.org and it works fine.

Gertjan

@4o4rh said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

In my NTP Server settings, I use de.pool.ntp.org and it works fine.

That's the NTP server process. It uses the WAN side.

Here this :

which has 'nothing' to do with the NTP DHCP server setting (the DJCP server operates on the LAN side of pfSense). The DHCP server can inform the DHCP clients of a known (local) NTP server, like pfSense, as it has a NTP server on board.
This DHCP (kea or ISC) 'NTP setting' needs to be an IP, and is typicality the pfSense LAN IP.

Example :

johnpoz

^exactly - pfsense allowed you to put in a fqdn for the dhcp server settings before. They would just translate that to an IP for dhcp settings. They should either modify the note below the box, or allow for fqdn (that they translate for you).. But fqdn is a bad idea because something like something.pool.ntp.org can resolve to lots of different IPs - that change, and pool members come and go so if they hand out IP X, tomorrow maybe that IP is no longer valid, etc

It really was never a good idea to allow users to put in fqdn for the dhcp server ntp it hands out.

4o4rh

@Gertjan ah ok. my clients take ntp from pfsense. that's why i don't run into this problem then.

pvk1

@4o4rh said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

@pvk1 do you mean in the ntp server? i don't have this problem. I am using normal country level ntp pools

I mentioned it because the DHCP server did not run when I migrated it the first time. It did not give an error.

johnpoz

@pvk1 yeah I think there is/was an issue with kea if you had fqdn for ntp before, that it would just not run.

Gertjan

@johnpoz said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

that it would just not run.

Exact.
If I do this :

and then I save :

I see a big red error message :

telling me that a host name is a no go.

Still, the tooltip told me :

johnpoz

@Gertjan yeah this is the confusing part for some users

Maybe that should of never been an option, since dhcp can never use it - but pfsense was doing some magic in the background to convert the fqdn you put in to an IP.. Which guess is ok if the ntp server only has 1 IP, etc.. But with a pool address which is very dynamic and pool membership is very fluid - since its really just users that add their server to the pool, these change all the time..

So in hindsight (which is always 20/20) allowing for fqdn prob not the best choice.

clawsonn

@Slowmotion-0 said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

As of this moment (Feb-2024), besides the static IP mapping approach, is there any other trick we can do to inject the KEA DHCP leases into DNS Resolver?

What is the KEA trick with static IP mapping approach?
I have a machine with 2.7.2 running KEA and dns resolver does not resolve any hostnames that are acquired from dhcp or hostnames that are DHCP static reservation ip mapped.

I read most the posts and appears that 24.11 PLUS has returned with this feature but my machine is CE not PLUS https://docs.netgate.com/pfsense/en/latest/releases/24-11.html "This release includes support for DNS Registration of DHCP client hostnames from the Kea DHCP daemon to the Unbound DNS Resolver"

johnpoz

@clawsonn just move back to isc, until such time that kea has all the features you want there is no reason to move to it.

Yes isc is end of life, doesn't mean it stopped working or that there are any sort of serious security risks with running it.

If your running CE version, wait til 2.8 comes out - hopefully kea will have the features you want then.

Gertjan

@clawsonn said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

I have a machine with 2.7.2 running KEA and dns resolver does not resolve any hostnames that are acquired from dhcp

Then this option would do the trick :
Under Services > DNS Resolver > General Settings, there is an option called "DHCP registration" (something like that, I don't have that anymore since I use Kea on 24.11)
If these host names are not valid ... call Houston. Some device don't even communicate a host name.
And worse : every time a lease is received, the pfSense DNS (resolver) gets restarted.

@clawsonn said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

or hostnames that are DHCP static reservation ip mapped

That's the option right after.
That option always worked for me, I've been using 2.7.2 for a while.
And you can check they are included in the local DNS cache : see this file : /etc/hosts
If this doesn't work for you : call Houston again : you have a DNS problem.

@clawsonn said in KEA DHCP missing "Register DHCP leases in DNS Resolver...":

I read most the posts and appears that 24.11 PLUS has returned with this feature but my machine is CE not PLUS

Correct. That's the new way of doing things.
With 24.11 I see these lines in the DHCP logs :

2024-12-10 08:05:49.292692+01:00 	kea2unbound 	72549 	Write include: /var/unbound/leases/leases4.conf (f8fa5d9f54dbf4eb328a3018566546c4e14278931f34a53625dc5d0cd16da077)
2024-12-10 08:05:49.230901+01:00 	kea2unbound 	72549 	Add record: "iphone-xii-gertjan.bhf.tld. 2400 IN A 192.168.1.35"

=> as soon as my phone connects to the LAN network, it gets a DHCPv4 lease.
The lease contains a valid host name, and the host name and IPv4 is communicated to the resolver (unbound).
I'm testing this now for a week or so. Its looking very good.
Btw : same story for the IPv6 and the reverse.

Don't worry, 2.8.x show up. Netgate wanted this new system to be tested first by the ones who are paying for it (Plus users) before its releases the same functionality into the 'free' version