OpenVPN? SSL ? – Before We Get Into The Topic, let’s Learn Some Basic Of This Topic
OpenVPN is a virtual private network (VPN) system that uses techniques to construct secure point-to-point or site-to-site connections, as well as remote access facilities, in routed or bridged configurations. It can run both client and server programs.
Peers can utilize pre-shared secret keys, certificates, or username/password to authenticate each other with OpenVPN. It allows the server to release an authentication certificate for each client utilizing signatures and a certificate authority when used in a multi-client-server arrangement.
It makes considerable use of the OpenSSL encryption library, as well as the TLS protocol, and has numerous security and control features. It employs a unique security protocol for key exchange, which makes use of SSL/TLS. It can get around firewalls and network address translators (NATs).
Several systems have been ported and incorporated with OpenVPN. The OpenVPN server capability, for example, is available in DD-WRT. The OpenVPN protocol is also implemented in SoftEther VPN, a multi-protocol VPN server.
Why SSL VPN?
SSL, IPSec, and PPTP are the three major VPN implementation families in use today. Because OpenVPN is an SSL VPN, it is incompatible with IPSec, L2TP, and PPTP.
Because the IPSec protocol is designed to be implemented as a kernel-space update to the IP stack, each operating system must have its own IPSec implementation.
OpenVPN’s user-space implementation, on the other hand, offers portability across operating systems and processor architectures, firewall and NAT-friendly operation, dynamic address support, and support for numerous protocols, including protocol bridging.
Both systems have advantages and downsides. The portability, ease of configuration, and compliance with NAT and dynamic addresses are the main benefits of OpenVPN’s methodology. Installing and using OpenVPN is similar to learning how to use other security-related daemon software like ssh.
Multi-vendor support has always been one of IPSec’s advantages, but that is beginning to change as OpenVPN support begins to develop on specialized hardware devices.
While the PPTP protocol has the advantage of having a client base that comes pre-installed on Windows platforms, cryptography experts have discovered security flaws.