In that cases, nethserver as a gateway, use a transparent squid, block all by default, open only allowed websites
Alternativelly if you want to use dns block list, nethserver as a gateway, block outgoing tcp 53, except for the ip of your pihole
In that cases, nethserver as a gateway, use a transparent squid, block all by default, open only allowed websites
Alternativelly if you want to use dns block list, nethserver as a gateway, block outgoing tcp 53, except for the ip of your pihole