Configuring Network95geographically separated offices to share one cohesive virtual network. VPN can also beclassified by the protocols used to tunnel the traffic. It provides security through tunnelingprotocols: IPSec, SSL, L2TP and PPTP.The system supports SSL VPN, which provides remote-access VPN capabilities through SSL.OpenVPN is a full featured SSL VPN software solution that creates secure connections in remoteaccess facilities and is designed work with the TUN/TAP virtual networking interface. TUN andTAP are virtual network kernel devices. TAP simulates a link layer device and provides a virtualpoint-to-point connection, while TUN simulates a network layer device and provides a virtualnetwork segment. The system uses OpenVPN to achieve the VPN feature. To prevent disclosureof private information, tunnel system must authenticate each other before secure VPN tunnel isestablished. After the VPN feature is configured properly on the system, the system acts as aVPN client and uses the certificates to authenticate the VPN server.To use VPN, the compressed package of VPN-related files should be uploaded to the system inadvance. The file format of the compressed package must be *.tar. The VPN-related files are:certificates (ca.crt and client.crt), key (client.key) and the configuration file (vpn.cnf) of the VPNclient. For more information, refer toOpenVPN Feature on Yealink IP Phones.VPN feature parameters on the system are described below.Parameter Description Configuration MethodVPN->ActiveEnables or disables VPN feature onthe system.Default: DisabledNote: You need to upload thecompressed package of VPN-relatedRemote ControlWeb User Interface
