Help Center/ Virtual Private Network/ Best Practices/ S2C Enterprise Edition VPN/ Connecting an On-premises Data Center to a VPC on the Cloud Through VPN (Access via Non-fixed IP Addresses)/ Overview
Updated on 2026-05-14 GMT+08:00
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Overview

Scenario

When an on-premises data center needs to access ECSs in a VPC, non-fixed IP addresses on the customer network can be used for the access.

Networking

In this example, a group of VPN connections are set up between an on-premises data center and a VPC to ensure network reliability. If one VPN connection fails, traffic is automatically switched to the other VPN connection, ensuring service continuity.

Figure 1 Networking diagram

Solution Advantages

Non-fixed public IP addresses in the on-premises data center can be used for cloud access, making the networking flexible and reducing the bandwidth cost.

Notes and Constraints

  • The on-premises data center supports VPN connections only in policy-based mode.
  • The negotiation must be initiated by the on-premises data center.
  • In non-fixed IP address access mode, only IKEv2 is supported. IKEv1 is not supported.