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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.
Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not controlled by the entity aiming to implement the VPN) or need to be isolated (thus making the lower network invisible or not directly usable).
IP VPN is most commonly deployed across an MPLS backbone as the inherent labeling of packets in MPLS lends itself to the identification of the customer VRF. Some IP VPN implementations (notably Nortel's IP-VPN Lite) use a simpler IP-in-IP encapsulation over a pure IP backbone, eliminating the need to maintain and support an MPLS environment.
The communication occurs between routers that are known as Provider Edge routers (PE routers), as they sit on the edge of the provider's network, next to the customer's network. Internet providers who have an existing Layer 2 network (such as ATM or Frame Relay ) may choose to use these VPNs instead of the other common MPLS VPN, Layer 3 .
The process of setting up an L2TP/IPsec VPN is as follows: Negotiation of IPsec security association (SA), typically through Internet key exchange (IKE). This is carried out over UDP port 500, and commonly uses either a shared password (so-called "pre-shared keys"), public keys, or X.509 certificates on both ends, although other keying methods ...
OpenVPN Access Server (OpenVPN-AS) is based on the Community Edition, but provides additional paid and proprietary features like LDAP integration, SMB server, Web UI management and provides a set of installation and configuration tools that are reported to simplify the rapid deployment of a VPN remote-access solution.
The first number represents the primary software version, with the second and third numbers representing the major software release. The last two numbers represent the minor and maintenance updates release, respectively. Major and minor releases typically introduce new features or product support, while maintenance releases are usually bug fixes.
Free and open-source software portal; OpenConnect is a free and open-source cross-platform multi-protocol virtual private network (VPN) client software which implement secure point-to-point connections. The OpenConnect client supports the following VPN protocols: Cisco AnyConnect; Juniper Secure Connect (since 7.05) [3]
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