Running your own BIND server gives you full control. Managed DNS gives you anycast, DDoS protection, and an API. Here is how to choose and how to switch.

Running your own authoritative DNS server gives you full control. Here is how to set up BIND9 for rootlog.in, create zone files, and test the setup.

Almost every 'DNS propagation delay' is actually a TTL issue. Here is how caching really works, plus /etc/hosts tricks and nsswitch.conf.

Most network problems are DNS problems. Here is a repeatable methodology for finding the root cause of any DNS issue.

A DNS zone is a database of records. Knowing how to read and query them with dig, host, and nslookup is a core sysadmin skill.

Every DNS query starts with a resolver. Understanding recursive vs iterative resolution is essential for troubleshooting and performance tuning.