VPN is most commonly used to enable remote access to a corporate network for employees working remotely. Strong authentication controls are typically enforced, to protect the corporate network against unauthorized access.
But not only corporation profit from a VPN: Home users can with VPN's alter routes normally decided by your ISP, Bypass geographical restrictions, Access service hosted at home from the outside without open ports needed and others.
OpenVPN is a SSL/TLS VPN which allows clients to install a software to directly connect to the private network. This is called a site-to-point communication. But also site-to-site scenarios are possible. Authentication normally is offered as pre-shared key or based on certificates and uses a strong TLS encryption for communication.
A relatively new SSL/TLS VPN is called Wireguard and is an interesting alternative to OpenVPN. While it only uses UDP for communication, it was incorporated into the linux kernel, resulting in higher throughput and lower latency compared to OpenVPN. Wireguard uses pre-shared symmetric keys for authentication and transmission. Currently Webtrend only supports point-to-sites setups over IPv4 and IPv6.
L2TP (Layer 2) and IPsec (Layer 3) are two different ways of establishing a VPN connection. Both of them are rather used for site-to-site connections or such that are used 24/7. Often L2TP and IPsec are combined because L2TP lacks confidentiality. Throughput is high, but not as high as Wireguard.
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