Enable IPv6 for a vSwitch

Regions that support IPv6 gateways

Prerequisites

• A VPC is created and IPv6 is enabled for the VPC. For more information, see Enable IPv6 for a VPC.

• The CIDR block that you specify for the new vSwitch does not overlap with the CIDR blocks of existing vSwitches in the VPC.

Create a vSwitch that supports IPv4 and IPv6

1. Log on to the VPC console.

2. In the left-side navigation pane, click vSwitch.

3. In the top navigation bar, select the region where you want to create the vSwitch.

4. On the vSwitch page, click Create vSwitch.

5. On the Create vSwitch page, set the following parameters and click OK.

   Parameter	Description

   Parameter	Description
   Resource Group	Select the resource group to which the vSwitch belongs.
   Tag Key	Select or enter a tag key. To facilitate management, you can add custom tags to identify vSwitches.
   Tag Value	Select or enter a tag value.
   VPC	Select the VPC to which the vSwitch belongs.
   IPv4 CIDR Block	The IPv4 CIDR block of the VPC is displayed.
   IPv6 CIDR Block	The IPv6 CIDR block of the VPC is displayed. Note If IPv6 is disabled for the VPC, click Enable IPv6. After IPv6 is enabled, the system automatically creates an IPv6 gateway of Free Edition.
   Name	Enter a name for the vSwitch.
   Zone	Select a zone for the vSwitch. In the same VPC, vSwitches in different zones can communicate with each other.
   IPv4 CIDR Block	Enter an IPv4 CIDR block for the vSwitch. When you specify a CIDR block for the vSwitch, take note of the following limits: The CIDR block of the vSwitch must be a subset of the CIDR block of the VPC. For example, if the CIDR block of the VPC is 192.168.0.0/16, you can specify a CIDR block from 192.168.0.0/17 to 192.168.0.0/29 for the vSwitch. The subnet mask of the vSwitch CIDR block must be 16 to 29 bits in length, which provides 8 to 65,536 IP addresses. The first IP address and the last three IP addresses of a vSwitch CIDR block are reserved. For example, if a vSwitch CIDR block is 192.168.1.0/24, the IP addresses 192.168.1.0, 192.168.1.253, 192.168.1.254, and 192.168.1.255 are reserved. If a vSwitch is required to communicate with vSwitches in other VPCs or with data centers, make sure that the CIDR block of the vSwitch does not overlap with the destination CIDR blocks. The CIDR block of a vSwitch cannot be the same as or larger than the destination CIDR block of a route in the route table of the VPC to which the vSwitch belongs. Important After you create a vSwitch, you cannot change its CIDR block.
   IPv6 CIDR Block	Specify an IPv6 CIDR block for the vSwitch. By default, the subnet mask of the IPv6 CIDR block of a vSwitch is /64. To specify the last 8 bits of the IPv6 CIDR block, enter an integer from 0 to 255. For example, if the IPv6 CIDR block of the VPC is 2xx1:db8::/64, you can enter 255 to define the last 8 bits of the IPv6 CIDR block of the vSwitch. In this case, the IPv6 CIDR block of the vSwitch is 2xx1:db8:ff::/64. ff is the hexadecimal value of 255.

Enable IPv6 for an existing vSwitch

1. Log on to the VPC console.

2. In the left-side navigation pane, click vSwitch.

3. In the top navigation bar, select the region where the vSwitch is deployed.

4. On the vSwitch page, find the vSwitch that you want to manage and click Enable IPv6 in the IPv6 CIDR Block column.

5. In the Enable IPv6 dialog box, select the type of the IPv6 CIDR block and click OK.

   By default, the subnet mask of the IPv6 CIDR block of a vSwitch is /64. To specify the last 8 bits of the IPv6 CIDR block, enter an integer from 0 to 255.

   For example, if the IPv6 CIDR block of the VPC is 2xx1:db8::/64, you can enter 255 to define the last 8 bits of the IPv6 CIDR block of the vSwitch. In this case, the IPv6 CIDR block of the vSwitch is 2xx1:db8::ff/64. ff is the hexadecimal value of 255.

References

• Operation references:

  • Create a VPC with an IPv6 CIDR block

  • Allow an ECS instance in a VPC to communicate with external IPv6 clients over the Internet

• API references:

  • CreateVSwitch: creates a vSwitch.

  • ModifyVSwitchAttribute: modifies the name and description of a vSwitch.