Interesting information and tools about the Domain Name System (DNS)
Students and readers of the Computer Networking: Principles, Protocols, and Practice ebook know that the Domain Name System is one of the key protocols on today’s Internet. A good understanding of the DNS is key to correctly understand how the Internet operates and debug some networking problems.
Julia Evans has a new very interesting project on Implementing DNS in a weekend. She explain how to build a complete DNS resolver from scratch in python. The pedagogical approach is very interesting and could probably be applied to other networking protocols.
Peter Lowe describes in a detailed blog post the most frequent usages of the TXT records in the DNS.
Facebook released a set of tools that allow to collect all the DNS requests made by applications on a Linux server. It leverages eBPF and other techniques to provide lots of information on the DNS queries that various applications execute.