Open the below ports to your Active Directory servers for Active Directory communication to work with clients
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Use DuckDNS to keep track of your external IP and use an external DNS name
Many users will remember the days when dynDNS was free and enabled you to log your router into a dynDNS account to keep track of your external IP changes. This enabled you to contact your resources via an external DNS domain name. You can now do this with DuckDNS which is a free dynamic DNS service.
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DNS Queries and lookups using NSLOOKUP
NSLOOKUP is a very powerful tool for troubleshooting and querying DNS servers and clients. There are a multitude of useful commands that will tell you everything you need to know about a DNS setup. Here are some useful commands and examples.