Functions

S2C VPN

S2C VPN provides various functions for you to establish VPN connections and build diversified networks flexibly. Table 1 describes the functions in detail.

**Table 1** S2C VPN functions
Function	Description	Applicable Region	Reference Link
VPN over Direct Connect	VPN over Direct Connect allows you to use a VPN link to back up a Direct Connect link. Traffic is automatically switched to the VPN link if the Direct Connect link fails.	The applicable regions are subject to those available on the console.	Allowing Direct Connect and VPN to Work in Active and Standby Mode to Link a Data Center to the Cloud
VPN hub	A VPN gateway on the cloud can function as a VPN hub. On-premises sites can communicate with each other through a VPN hub, eliminating the need to configure VPN connections between every two sites.		Connecting Multiple On-premises Branch Networks Through a VPN Hub
Encryption for data transmitted over Direct Connect lines	When an on-premises data center connects to the cloud through Direct Connect lines, VPN can be used to encrypt the data leaving and entering the cloud.		Using VPN to Encrypt Data over Direct Connect Lines
Access through two Internet lines	An on-premises data center can use two public IP addresses to connect to a VPN gateway, so that it connects to the cloud through two Internet lines.		Using VPN to Connect to the Cloud Through Two Internet Lines

P2C VPN

P2C VPN provides various functions that enable secure and encrypted access to enterprise internal network resources. Table 2 describes the functions in detail.

**Table 2** P2C VPN functions
Function	Description	Applicable Region	Reference Link
Certificate authentication	Clients can use the certificates issued by a CA to connect to a VPN gateway for access to a VPC.	The applicable regions are subject to those available on the console.	Configuring Enterprise Edition P2C VPN to Connect Mobile Terminals to a VPC (Certificate Authentication)