N2n

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n2n
Developer(s)	n2n team
Initial release	March 27, 2008 (2008-03-27)
Written in	C
Operating system	FreeBSD, Linux, OpenWrt, Mac OS X, Unix, Windows
Type	VPN
License	GNU General Public License
Website	ntop.org/products/n2n

n2n is an open source Layer 2 over Layer 3 VPN application which utilises a 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.^[1]

It is free software licensed under the terms of the GNU General Public License v3.

References

↑ http://www.ntop.org/products/n2n/ : "[the supernode] is basically a directory register and a packet router for those nodes that cannot talk directly"

External links

n2n home page

v t e Virtual private networking

Communications protocol	SSTP IPsec L2TP L2TPv3 PPTP Split tunneling SSL/TLS (Opportunistic : tcpcrypt)

Free software	n2n Openswan OpenVPN Social VPN strongSwan tcpcrypt tinc Cloudvpn VTun Libreswan

Vendor-driven protocols	Layer 2 Forwarding Protocol DirectAccess

Proprietary software	Check Point VPN-1 Cisco Systems VPN Client Gbridge Hamachi Microsoft Forefront Unified Access Gateway Wippien

Risk Vectors	Content-control software Deep content inspection Deep packet inspection IP address blocking Network enumeration Stateful firewall TCP Reset VPN blocking

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