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prefer internal links to vpn software.

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## About dn42
dn42 is a big dynamic [VPN](http://en.wikipedia.org/wiki/Virtual_private_network), which employs Internet technologies ([BGP](http://en.wikipedia.org/wiki/Bgp), whois database, [DNS](http://en.wikipedia.org/wiki/Domain_Name_System), etc). Participants connect to each other using network tunnels ([GRE](http://en.wikipedia.org/wiki/Generic_Routing_Encapsulation), [OpenVPN](http://en.wikipedia.org/wiki/Openvpn), [Tinc](http://tinc-vpn.org/), [IPsec](http://en.wikipedia.org/wiki/IPsec)) and exchange routes thanks to the Border Gateway Protocol. Network addresses are assigned in the `172.22.0.0/15` and `172.20.0.0/16` range and private AS numbers are used (see [registry](/services/Whois)) as well as IPv6 addresses from the ULA-Range (`fd00::/8`) - see [FAQ](https://internal.dn42/FAQ#frequently-asked-questions_what-about-ipv6-in-dn42).
dn42 is a big dynamic [VPN](http://en.wikipedia.org/wiki/Virtual_private_network), which employs Internet technologies ([BGP](http://en.wikipedia.org/wiki/Bgp), whois database, [DNS](http://en.wikipedia.org/wiki/Domain_Name_System), etc). Participants connect to each other using network tunnels ([GRE](/howto/GRE-on-FreeBSD), [OpenVPN](/howto/openvpn), [Tinc](/howto/tinc), [IPsec](/howto/IPsec-with-PublicKeys)) and exchange routes thanks to the Border Gateway Protocol. Network addresses are assigned in the `172.22.0.0/15` and `172.20.0.0/16` range and private AS numbers are used (see [registry](/services/Whois)) as well as IPv6 addresses from the ULA-Range (`fd00::/8`) - see [FAQ](https://internal.dn42/FAQ#frequently-asked-questions_what-about-ipv6-in-dn42).
A number of services are provided on the network: see [internal](http://wiki.dn42/internal/Internal-Services) (only available from within dn42). Also, dn42 is interconnected with other networks, such as [ChaosVPN](http://wiki.hamburg.ccc.de/ChaosVPN) or some [Freifunk](http://en.wikipedia.org/wiki/Freifunk) networks.