Re: How do you keep dhcpd and nsd/unbound in sync?

On Thu, Feb 26, 2026 at 10:39 AM Martin <iio7@protonmail.com> wrote:

Currently we run Unbound without NSD for our local net where
Unbound has a local file with IPs and PTRs for the LAN. We
also use dhcpd to assign fixed IPs based on the MAC.

So far all is done manually. Is there some way to automatically
add hosts and hostnames to Unbound when a lease is granted from
dhcpd or some other way?

Not per base only, I think.

The standard answer seems to be "install dnsmasq".

Your best option might be looking into incron and/or monit. Then you can monitor for (immediate/realtime) changes to /var/db/dhcpd.leases and act accordingly against unbound.

It will involve scripting and parsing, and you'll be at the mercy of non-base tools, but it should be doable.

Let us know if you cook something up. I'm going to give it a shot myself – one day.

Kind regards