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DHCP config

Create a .conf file like /etc/private-lan/volumes/dnsmasq/dhcp.conf.
To configure your DHCP server refer to the official documentaion.

Just for orientation, here is how my config looks like:

dhcp-authoritative

## New devices default ##
dhcp-range=192.168.178.200,192.168.178.254,24h
# Gateway
dhcp-option-force=3,192.168.178.2
# DNS1 and DNS2
dhcp-option-force=6,192.168.178.3,192.168.178.3

## Known devices (static IP address) default ##
# Devices in the IP range .20 - .199 are assigned to tag '0'
dhcp-range=set:0,192.168.178.20,192.168.178.199,24h
dhcp-option-force=tag:0,3,192.168.178.1
dhcp-option-force=tag:0,6,192.168.178.2,192.168.178.2

## Settings for devices which were assigned the 'VPN' tag ##
dhcp-option-force=tag:VPN,3,192.168.178.2
dhcp-option-force=tag:VPN,6,192.168.178.3,192.168.178.3

dhcp-leasefile=/etc/dnsmasq.d/dhcp.leases
#quiet-dhcp

domain=lan
dhcp-rapid-commit

Example for the static DHCP leases:

# /etc/private-lan/volumes/dnsmasq.d/static-leases.conf

dhcp-host=81:7d:22:a2:3e:7d,192.168.178.20,PC-VPN,set:VPN
dhcp-host=81:7d:22:a2:3e:7e,192.168.178.21,PC

Restart dnsmasq

$ docker restart dnsmasq

Disable other DHCP servers

Most likely you have to disable the DHCP server of your router. How to do this depends on the router but while some may not allow you to configure a custom DNS server, there is almost always an option to turn off it's DHCP server.