amazon web services - DNS issue - Windows Domain Controller 2016 - Unable to resolve public and private hosts

I have configured a Domain Controller on a Windows Server 2016 (in AWS). Before setting up the AD I can able to browse the internet. But after configured the AD I can't able to ping the computers which all are added to that domain(but if I use FQDN its working). Also, I can't able to access the internet. But whenever I tried to ping using IP address I can able to access them. Public websites also.

• My windows domain name: sql.com


• I tried to add the 8.8.8.8 in the forwarders - Able to access all the websites.



• In Append this DNS suffix I added sql.com - Able to ping all the computers using their name.

1. VPC range: 172.31.0.0/16


2. In DC DNS IP in IPv4 properties: 127.0.0.1


3. Domain name: sql.com


4. Reverse lookup: created (PTR records are also there)



5. In AWS my AD and other servers are in public subnet. Necessary ports are opened.

1. Why I couldn't able to ping the servers using their names (before adding the Append DNS suffix).




2. Why I couldn't able to access the internet (until I have added the 8.8.8.8 to the DNS forwarders.)




3. If I removed the google DNS IP from the forwarders and removed Append DNS suffix, after reboot the Network shows Public Network instead of a domain network.

Can anyone help me to understand at least first 2 questions,But Im using Windows Server 2012 from past few years where I didn't face any issues like this.