VPC knowledge for users from beginner level to expert level
Be a Power User
You can adjust your network based on your service requirements and view monitoring metrics to learn the health status of your network in real time.
O&M and Monitoring
You can plan and configure your networks to meet your service requirements.
Planning and Configuration
Learn more about common issues and solutions.
How Do I Configure the Policy-Based Routing for ECSs with Multiple NICs?
Which CIDR Blocks Are Available to the VPC Service?
What Do I Do If Outbound Access Through TCP Port 25 Is Restricted?
What Do I Do If a Virtual IP Address Cannot Be Pinged After Being Bound to an ECS NIC?
Can Subnets Communicate with Each Other?
Can I Modify the CIDR Block of a Subnet?
What Do I Do If a Subnet Cannot Be Deleted Because It Is Being Used by Other Resources?
What Can I Do If VPCs in a VPC Peering Connection Cannot Communicate with Each Other?
VPC and Subnet
How Do I Assign or Retrieve a Specific EIP?
What Are the Differences Between an EIP, a Private IP Address, a Floating IP Address, and a Virtual IP Address?
How Do I Access the Internet Using the EIP Bound to the Extension NIC?
How Many ECSs Can One EIP Be Assigned to?
How Do I Check Whether the Bandwidth Exceeds the Limit?
Why Cannot I Access Public Websites Through Domain Names or Access Internal Domain Names in the Cloud When My ECS Has Multiple NICs?
What Are the Priorities of the Custom Route and EIP If Both Are Configured for an ECS to Enable the ECS to Access the Internet?
What Do I Do If Intermittent Interruption Occurs When a Local Host Accesses a Website Built on an ECS?
What Do I Do If ECSs Using Private IP Addresses in the Same Subnet Only Support One-Way Communication?
What Do I Do If Two ECSs in the Same VPC Cannot Communicate with Each Other or Packet Loss Occurs During the Communication Between the Two ECSs?
What Do I Do If VPCs in a VPC Peering Connection Cannot Communicate with Each Other?