Recently, Application Layer VPN based SSL (Secure Socket Layer)/TLS (Transport Layer Security) becomes popular. An extension of TLS protocol, DTLS (Datagram Transport Layer Security) protocol is used to secure datagram transport.

• DTLS(Datagram Transport Layer Security)协议是TLS协议的变体,用于在不可靠传输网络上对应用层数据提供安全保护。