third example configuration file

[hannesm]

from https://docs.fedoraproject.org/en-US/fedora-server/administration/dnsmasq/

 # /etc/NetworkManager/dnsmasq.d/01-DNS-example-lan.conf
 # This file sets up DNS for the private local net domain example.lan
 local=/example.lan/
 # file where to find the list of IP - hostname mapping
 addn-hosts=/etc/dnsmasq.hosts

 domain-needed
 bogus-priv

 # Automatically add <domain> to simple names in a hosts-file.
 expand-hosts

 # interfaces to listen on
 interface=lo
 interface=enp2s0
 # in case of a bridge don't use the attached server virtual ethernet interface

 # The below defines a Wildcard DNS Entry.
 #address=/.localnet/10.10.10.zzz

 # Upstream public net DNS server (max.three)
 no-poll
 server=134.102.xx.yy
 server=134.102.uu.vv
 server=2001:638:xxx:yyy::zz

## Configuration of the DHCP service for the private network (example.lan)</p>
 # etc/NetworkManager/dnsmasq.d/02-DHCP-example-lan.conf
 # This file sets up DHCP for the private local net domain example.lan

 # The domain the DHCP part of dnsmasq is responsible for:
 domain=example.lan,10.10.10.0/24,local

 # interfaces to listen on
 interface=enp2s0

 # general DHCP stuff (options, see RFC 2132)
 # 1: subnet masq
 # 3: default router
 # 6: DNS server
 # 12: hostname
 # 15: DNS domain (unneeded with option 'domain')
 # 28: broadcast address

 dhcp-authoritative
 dhcp-option=1,255.255.255.0
 dhcp-option=3,10.10.10.10
 dhcp-option=6,10.10.10.1

 # Assign fixed IP addresses based on MAC address
 # dhcp-host=00:1a:64:ce:89:4a,NAME01,10.10.10.50,infinite
 # dhcp-host=52:54:00:42:6a:43,NAME02,10.10.10.51,infinite

 # Assign dynamically IP addresses to interface to listen on
 # Range for distributed addresses, tagged &lt;int&gt; for further references dhcp-range=tag:enp2s0,10.10.10.150,10.10.10.200,24h

### Configuration of the DHCP service for the public network (example.com)</p>
 # etc/NetworkManager/dnsmasq.d/03-DHCP-example-com.conf
 # This file sets up DNCP for the public example.com domain interface

 # The domain the DHCP part of dnsmasq is responsible for:
 domain=example.com,134.102.xx.yy/27

 # interfaces to listen on
 interface=enp1s0

 # general DHCP stuff (options, see RFC 2132)
 # 1: subnet masq
 # 3: default router
 # 6: DNS server
 # 12: hostname
 # 15: DNS domain (unneeded with option 'domain')
 # 28: broadcast address

 ##dhcp-authoritative
 ## we just send the bare minimum, e.g. no DNS server
 ##dhcp-option=1,255.255.255.224
 dhcp-option=tag:enp1s0,option=router,134.102.3.30

 # Assign fixed IP addresses based on MAC address
 # dhcp-host=00:1a:64:ce:89:4a,thootes,10.10.10.50,infinite
 # dhcp-host=52:54:00:42:6a:43,apollon,10.10.10.51,infinite
 # Assign dynamically IP addresses to interface to listen on
 # Range for distributed addresses, tagged &lt;int&gt; for further references dhcp-range=tag:enp1s0,134.102.3.19,134.102.3.26,1h