OpenVPN is one of the most widely used VPN protocols. It was developed in late 2001 by American programmer James Yonan, the founder of OpenVPN Technologies. The protocol continues to be actively maintained and updated.
OpenVPN Characteristics
Advantages
- uses the OpenSSL cryptographic library, allowing it to support a wide range of encryption and authentication algorithms, including SSL/TLS;
- supports dynamic IP addresses and DHCP;
- can operate over both TCP and UDP;
- is compatible with most major operating systems;
- can work through various types of proxy servers, including HTTP and SOCKS, as well as through NAT and certain network filters.
One of the reasons for OpenVPN's popularity is its high level of security and flexibility. An OpenVPN server can be configured to listen on different TCP or UDP ports, which can make VPN traffic less conspicuous and, in some network environments, help bypass VPN blocking.
Disadvantages
- Can be relatively resource-intensive: OpenVPN places a greater emphasis on security and cryptographic protection than some newer VPN protocols. The additional processing overhead can result in lower connection speeds, particularly on devices with limited resources. This can make it less suitable for bandwidth-intensive activities such as streaming and live video;
- complex to configure: users without technical experience may find manual OpenVPN configuration difficult. In most cases, it is easier to use configuration files supplied by the VPN provider or a dedicated VPN client or application provided by the service.