Unbound (DNS server)

Unbound
Developer(s) NLnet Labs
Initial release February 19, 2007 (2007-02-19)
Stable release
1.8.0[1] / September 10, 2018 (2018-09-10)
Repository https://nlnetlabs.nl/svn/unbound/
Written in C
Operating system Unix-like, Windows
Type DNS server
License BSD license
Website unbound.net

Unbound is a validating, recursive, and caching DNS resolver product from NLnet Labs. It is distributed free of charge in open source form under the BSD license.

Features

  • Caching resolver with prefetching of popular items before they expire
  • DNS over TLS forwarding and server, with domain-validation[2]
  • DNS64
  • DNSCrypt[3]
  • DNSSEC validating
  • EDNS Client Subnet

History

Originally designed by Jakob Schlyter of Kirei and Roy Arends of Nominet in 2004, funding was provided by VeriSign and ep.net to develop a prototype written in Java (David Blacka and Matt Larson, VeriSign). In 2006, the prototype was re-written for high-performance in the C programming language by NLnet Labs.

Unbound is designed as a set of modular components that incorporate modern features, such as enhanced security (DNSSEC) validation, Internet Protocol Version 6 (IPv6), and a client resolver application programming interface library as an integral part of the architecture. Originally written for POSIX-compatible Unix-like operating system, it runs on FreeBSD, OpenBSD, NetBSD, OS X, and Linux, as well as Microsoft Windows.

Reception

Unbound has supplanted the Berkeley Internet Name Daemon (BIND) as the default, base-system name server in two BSD-based open source distributions, where it is perceived as smaller, more modern, and more secure for most applications.[4][5]

See also

References

  1. ↑ Wijngaards, Wouter (10 September 2018). "Unbound 1.8.0 released". unbound-users (Mailing list). Retrieved 20 September 2018.
  2. ↑ "Actually secure DNS over TLS in Unbound". Ctrl blog. 2018-06-07. Retrieved 2018-06-11.
  3. ↑ ""Adding DNSCrypt to Unbound". ProToxin. 2017-04-14. Retrieved 2018-06-11.
  4. ↑ "Heads Up: BIND Disabled in Base". OpenBSD Journal. August 23, 2014. Retrieved June 10, 2015.
  5. ↑ Dag-Erling Smørgrav (September 24, 2014). "DNS in FreeBSD 10". Dag-Erling Smørgrav's blog. Retrieved June 10, 2015.
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