1. Overview
1.1 Experiment targets
▪ Learn the relevant knowledge of DNS (Domain Name System) protocol.
▪ Based on the programming practice of previous experimental classes, complete a
prototype of DNS system based on Linux command line terminal (including client and
server).
▪ Complete the implementation of English domain name resolution.
1.2 Experiment requirements
Basic requirements:
▪ Implement English domain name resolution like: www.bupt.edu.cn.com;
Example database records:
www.bupt.edu.cn, 86400, IN, A, 192.168.1.25
bupt.edu.cn, 86400, IN, MX, mx.bupt.edu.cn
mx.bupt.edu.cn, 86400, IN, A, 192.168.1.37
▪ Support at least 4 top-level domains, at least three - level domain name resolution. The
program needs to implement entities: client, at least 6 DNS servers (including local DNS
server).
4 top-level domains:.cn,.org,.com, and.us
secondary and tertiary domains: custom (e.g. Edu.cn, bupt.edu.cn, etc.)
The deployment architecture of DNS server can be seen in the following example:
Figure.1-1
▪ Supported Resource Record types: A, MX, CNAME; For MX type queries, ask for the
corresponding IP address in the Additional Section.
▪ Supported parsing methods like iterative parsing.
▪ Transport layer protocol:
Between client and local DNS server: TCP.
