Originally Posted by rosa hsiao
But I had seen from some posts in this forum that if using IP Sharer as a firewall and gateway (18.104.22.168) ,I should use internal IP for all the DNS A Records. Since I have configured the gateway to forward my external IP to internal IP and Port 53 is not blocked.
This will only work inside your local network. Say you have configured DNS for the domain example.com so that it points to 192.168.0.100 (internal IP address), then you can use the DNS server inside your local network, because example.com will be resolved to 192.168.0.100. If someone outside your local network uses the DNS server and wants to access example.com, that won't work because example.com will still be resolved to 192.168.0.100 which is not a public IP address and therefore cannot be accessed from the outside.