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doc-exports/docs/vpc/umn/en-us_topic_0030969424.html
Qin Ying, Fan 662ede2c6b VPC UMN 20240105 version 
Reviewed-by: Sarda, Priya <prsarda@noreply.gitea.eco.tsi-dev.otc-service.com>
Co-authored-by: Qin Ying, Fan <fanqinying@huawei.com>
Co-committed-by: Qin Ying, Fan <fanqinying@huawei.com>
2024-04-18 12:13:40 +00:00

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Subnet

A subnet is a unique CIDR block with a range of IP addresses in a VPC. All resources in a VPC must be deployed on subnets.

  • By default, all instances in different subnets of the same VPC can communicate with each other. If you have a VPC with two subnets in it, they can communicate with each other by default.
  • After a subnet is created, its CIDR block cannot be modified. Subnets in the same VPC cannot overlap.

    A subnet mask can be between the netmask of its VPC CIDR block and /29 netmask. If a VPC CIDR block is 10.0.0.0/16, its subnet mask can be between 16 and 29.

    For example, if the CIDR block of VPC-A is 10.0.0.0/16, you can specify 10.0.0.0/24 for subnet A01, 10.0.1.0/24 for subnet A02, and 10.0.3.0/24 for subnet A03.

    By default, you can create a maximum of 100 subnets in each region. If this cannot meet your service requirements, request a quota increase by referring to What Is a Quota?

Parent topic: Basic Concepts