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link to ChaosVPN

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howto/tinc.md
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[Tinc](http://www.tinc-vpn.org/) is a meshing VPN daemon. It allows multiple parties to connect and discover each other independently, while minimizing points of failure. Tinc will use a bunch of nodes to build the network graph, which in return all nodes use to learn addresses for each other. If nodes want to reach each other they establish a direct connection to each other. If that is not possible traffic may be routed via a shared neighbour. Tinc is most notably powering the Freifunk communitys [ICVPN](https://github.com/freifunk/icvpn) (in L2/Switch-Mode) and ChaosVPN (in L3/Router-Mode).
[Tinc](http://www.tinc-vpn.org/) is a meshing VPN daemon. It allows multiple parties to connect and discover each other independently, while minimizing points of failure. Tinc will use a bunch of nodes to build the network graph, which in return all nodes use to learn addresses for each other. If nodes want to reach each other they establish a direct connection to each other. If that is not possible traffic may be routed via a shared neighbour. Tinc is most notably powering the Freifunk communitys [ICVPN](https://github.com/freifunk/icvpn) (in L2/Switch-Mode) and [ChaosVPN](http://wiki.hamburg.ccc.de/ChaosVPN) (in L3/Router-Mode).
Tinc primarily operates in two modes: router and switch. A third mode, the hub mode, exists, but it's just a dumb router mode that keeps no routing table and broadcasts everything - don't use it.
In Router mode each peer announces the addresses/subnets it serves. Tinc will spawn an interface on which it will act as a L3 network, routing according to announcements. This is the default mode, but it is unsuitable for dn42, because you cannot influence how tinc will route to a certain network. In Switch mode tinc will act like a L2 network, in which the routing table reflects the peers mac addresses.