pihole

piholeDnsmasqIgnoringQuery

# 2022 - after update from 5.6 to 5.8.1 pihole stops resolving local DNS records
# dnsmasq throws a warning -  Ignoring query from non-local network

# 1. make sure that your DNS has only one IP address 
more /etc/dhcpcd.conf
more /etc/network/interfaces

# 2. your network interface may be statically configured or you may use dhcp, 
#    it does not matter, unless it's IP address is constant

# *. make a backup of /etc/dnsmasq.conf - will redirect you to /etc/dnsmasq.d
#    here you'll find configuration related to the main actor

# **. just to be on the safeside, in case you are not using it, disable IPv6
#     by adding following lines at the bottom of /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.tun0.disable_ipv6 = 1

# 3. reconfigure the pihole, that it uses the IP address you have bound to the main interface
pihole -r
#    bare in mind each reconfiguration clears the dnsmasq configuration in version 5.8.1 of pihole

# 4. make sure that within your dnsmasq configuration stored in /etc/dnsmasq.d 
#    there is following entry as per the following article https://docs.pi-hole.net/ftldns/dnsmasq_warn/
#    Ignoring query from non-local network - excplicitelly indicates that the deamon got crazy and
#    could not figure out on which interface is should be listening to
#    to fix that add following entry into the dnsqmasq config in my case /etc/dnsmasq.d/01-pihole.conf
interface=eth0

# 5. then restart the dns service on the pihole
sudo service pihole-FTL restart
#    or
pihole restartdns

# that's it