Lessons Learned When Building My DNS Resolver

The Implement DNS in a weekend project by Julia Evans is a guide for building your own DNS resolver from scratch, with explanations on the DNS message format and compression techniques. The Header section in the DNS message has a fixed length of 64 bits and contains essential flags for processing queries and responses. Resource records in the Answer, Authority, and Additional sections share a common format with fields such as name, type, class, TTL, and RDATA.