Im playing arround and configured a CentOS 7 VM to work as router for other clients on the network, following this guide: https://linuxtechlab.com/turning-centosrhel-6-7-machine-router/. Everything works fine, clients can ping external ip address, 22.214.171.124 & 126.96.36.199 as example.
But cant resolve any dns/hostname. Google & Quad 9 are configured as DNS server (for the clients) but it seems that my CentOS 7 Router block the DNS request.
Can someone give me a tipp how to solve this issue ?