Help Center/ Virtual Private Network/ FAQs/ FAQs - S2C Classic VPN/ Product Consultation/ How Do I Plan the CIDR Block of a VPC Accessed over a VPN Connection?
Updated on 2025-08-20 GMT+08:00

How Do I Plan the CIDR Block of a VPC Accessed over a VPN Connection?

  • The VPC CIDR block cannot conflict with the on-premises CIDR block.
  • To avoid conflicts with cloud service addresses, do not use 127.0.0.0/8, 169.254.0.0/16, 224.0.0.0/3, 100.64.0.0/10, 100.64.0.0/12, and 214.0.0.0/8 for your on-premises network.

    If you need to use 100.64.0.0/10 or 100.64.0.0/12, submit a service ticket.