NSD (Name Server Daemon) is an open-source, lightweight DNS server software that is designed to be fast, secure, and easy to configure. It was developed by NLnet Labs, and is widely used by small to medium-sized networks.
NSD is primarily designed to be used as an authoritative DNS server, and is optimized for high-performance and low-resource usage. It supports a range of advanced features, including DNSSEC (Domain Name System Security Extensions), which provides enhanced security for DNS queries and responses.
One of the key features of NSD is its simplicity. It is designed to be easy to configure and maintain, with a simple configuration file that can be easily edited by hand. It also includes built-in support for zone transfers, which allows for easy replication of DNS data between servers.
NSD is highly customizable, with a modular architecture that allows for easy extension and customization. It can be integrated with other DNS server software, such as Unbound, to provide a complete DNS solution.
Overall, NSD is a lightweight and highly configurable open-source DNS server software that is ideal for use as an authoritative DNS server in small to medium-sized networks. Its focus on simplicity, security, and performance makes it a popular choice for users who need a reliable and easy-to-manage DNS server.