dnsmasq is capable of being all that.

https://wiki.archlinux.org/title/dnsmasq

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Consider using a pi-hole.

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I second this. It makes it trivial to have DNS on the home network for internal hosts and you get all the nice DNS based ad blocking.

Evo2.

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Thank you for the pi hole suggestion. I'll look into that.

QUESTION: Can someone direct me to a HOWTO for in-home DNS?
The last time I had this working, I used a small army of /etc/host file updates and fixed IP addresses for the in-house devices. Now that most devices go walk-about, DHCP rules the day.
I"d love to have fixed IP at home and DHCP in the wild. I haven't discovered how to do that... yet.

QUESTION: Will I need to change LAN Gateway settings for this to work properly?
Currently, my gateway router is the LAN "gateway" IP address. I do not have any sort of DMZ.

I have not played with Pi-hole but it uses a forked version of dnsmasq and can be configured as a DHCP server.
You can configure your devices to use a fixed IP address from the DHCP server by setting up an address reservation. This is typically accomplished using the MAC address and assigning an IP address that is outside the DHCP address range. Pretty much all SOHO routers now days support address reservations.

If you use the Pi-hole or other dnsmasq server you will need to turn off the DHCP server on the router and set a gateway address on the dnsmasq server that points to the router's address.

Here are a couple of guides.
https://wiki.archlinux.org/title/dnsmasq
https://www.tecmint.com/setup-a-dns-...n-centos-rhel/

michaelk is right of course, but I use a much easier possibility. I have configured /etc/hosts at the pi-hole to point to my local lan clients.

That works because dnsmasq will add the the static clients in the /etc/hosts to its local dns records. You need to configure your clients with static ip addresses or just rely on the dhcp server to always assigning the same address to the same client. On a small lan and a big dhcp address pool that should work but not 100% guaranteed. Then all you need to do is change the router's settings for your clients to use the Pi-hole as DNS server.

When you say, " configure your clients with static IP addresses " are you talking about the gateway-router feature that maps a client MAC address to a LAN IP address? My router insists that the target IP addresses lie inside the configured DHCP space.

Readings elsewhere online suggest that I configure clients outside of the DCHP space. Doesn't that mean I configure each client at the client? I don't know any way to do that for phones and tablets. Only some of my IOT devices have a way to set the IP address if not DHCP.

Thanks for the reply, but I'm confused,
~~~ 0;¬/ Dan

Yes, setting address reservations for dnsmasq DHCP server and isc-dhcp-server as far as I know are outside of the DHCP pool whereas SoHo router's address reservations tend to be within the pool. You should not have to set a static IP address on the device itself. Iphones and Androids mobile devices tend to have the automatic MAC changers on by default now days which makes which makes using address reservations or /etc/hosts as posted difficult on purpose.

On Lan systems one used to use Hosts files. I still do.