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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).
OpenVPN has been integrated into several router firmware packages allowing users to run OpenVPN in client or server mode from their network routers. A router running OpenVPN in client mode, for example, allows any device on a network to access a VPN without needing the capability to install OpenVPN.
A VPN maintains an authenticated, encrypted tunnel for securely passing data traffic over public networks (typically, the Internet.)Other VPN types are IPsec VPNs, which are useful for point-to-point connections when the network endpoints are known and remain fixed; or SSL VPNs, which provide for access through a Web browser and are commonly used by remote workers.
VPNs allow users to bypass regional restrictions by hiding their IP address from the destination server and simulating a connection from another country. For example, users in regions with limited streaming libraries can use VPNs to access content available in other locations, such as accessing Netflix US from abroad.
For example, suppose a user utilizes a remote access VPN software client connecting to a campus network using a hotel wireless network. The user with split tunneling enabled is able to connect to file servers , database servers , mail servers and other servers on the corporate network through the VPN connection.
A VPN Server can have local bridges. A local bridge is the layer-2 packet-switching fabric between a physical Ethernet network-adapter and a Virtual Hub. The administrator defines a local bridge between the Virtual Hub and the existing corporate network to build a remote-access VPN server or a site-to-site VPN server.
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