n2n is an open source Layer 2 over Layer 3 VPN app utilising peer-to-peer architecture for network membership and routing.
Unlike many other VPN programs, n2n can also connect computers which reside behind NAT routers. These connections are set up with help from a third computer that both computers can reach. This computer, called a supernode, can then route the information between NATed nodes.[2]
It is free software licensed under the terms of the GNU General Public License v3.[3]
n3n forked from n2n in 2023.[4]
Turbo VPN is a custom Windows server/client implementation of n2n.[citation needed]
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