1# Unbound 2 3[](https://travis-ci.org/NLnetLabs/unbound) 4[](https://repology.org/project/unbound/versions) 5 6Unbound is a validating, recursive, caching DNS resolver. It is designed to be 7fast and lean and incorporates modern features based on open standards. If you 8have any feedback, we would love to hear from you. Don’t hesitate to 9[create an issue on Github](https://github.com/NLnetLabs/unbound/issues/new) 10or post a message on the [Unbound mailing list](https://nlnetlabs.nl/mailman/listinfo/unbound-users). 11You can lean more about Unbound by reading our 12[documentation](https://nlnetlabs.nl/documentation/unbound/). 13 14## Compiling 15 16Make sure you have the C toolchain, OpenSSL and its include files, and libexpat 17installed. Unbound can be compiled and installed using: 18 19``` 20./configure && make && make install 21``` 22 23You can use libevent if you want. libevent is useful when using many (10000) 24outgoing ports. By default max 256 ports are opened at the same time and the 25builtin alternative is equally capable and a little faster. 26 27Use the `--with-libevent=dir` configure option to compile Unbound with libevent 28support. 29 30## Unbound configuration 31 32All of Unbound's configuration options are described in the man pages, which 33will be installed and are available on the Unbound 34[documentation page](https://nlnetlabs.nl/documentation/unbound/). 35 36An example configuration file is located in 37[doc/example.conf](https://github.com/NLnetLabs/unbound/blob/master/doc/example.conf.in). 38
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