dnsmasq

Also written: kc-dns.conf, kc-office.conf

A small DNS and DHCP server that reads all its settings from one config file. It can serve as a domain's authoritative DNS server, as a caching resolver that forwards questions and remembers answers, or as an office DHCP server, as it does for Kettle & Crane.

Where the book teaches it

Chapter 3: How DNS works
Chapter 4: DNS in practice
Chapter 5: DHCP and leases
Chapter 10: Project: the full Kettle & Crane office