How about to set up a device that works locally at your friends' house as DNS server, but don't forget to install something like zerotier, so you can access it without setting up a port forward. With that, you can help them with the maintenance of their DNS server.
How about to set up a device that works locally at your friends' house as DNS server, but don't forget to install something like zerotier, so you can access it without setting up a port forward. With that, you can help them with the maintenance of their DNS server.