NAT Gateway:CreateSnatEntry

The region ID of the NAT gateway.

Call DescribeRegions to query available regions.

Valid values:

• ap-northeast-2-pop

  :

  ap-northeast-2-pop

  .

The ID of the SNAT table.

The ID of the vSwitch.

• For Internet NAT gateways, ECS instances in the specified vSwitch use this SNAT entry to access the Internet. If multiple EIPs form an SNAT address pool, connections are hashed across them and traffic may be unevenly distributed. To prevent service interruptions from individual EIP bandwidth limits, associate these EIPs with the same EIP bandwidth plan.

• For VPC NAT gateways, ECS instances in the specified vSwitch use this SNAT entry to access external networks.

The CIDR block of a VPC, vSwitch, ECS instance, or a custom CIDR block.

Valid CIDR block types:

• VPC CIDR block: all ECS instances in the VPC access the Internet or external networks through SNAT.

• vSwitch CIDR block (for example, 192.168.1.0/24): ECS instances in the vSwitch access the Internet or external networks through SNAT.

• ECS instance IP address (for example, 192.168.1.1/32): the ECS instance accesses the Internet or external networks through SNAT.

• Custom CIDR block: all ECS instances in the CIDR block access the Internet or external networks through SNAT.

For Internet NAT gateways, if SnatIp is set to one EIP, the ECS instance uses that EIP. If multiple EIPs are specified, the instance randomly selects one.

This parameter is mutually exclusive with SourceVSwitchId.

• For Internet NAT gateways: the EIPs in the SNAT entry. Separate multiple EIPs with commas (,).

• For VPC NAT gateways: the NAT IP addresses in the SNAT entry. Separate multiple NAT IP addresses with commas (,).

The name of the SNAT entry.

The name must be 2 to 128 characters in length. It must start with a letter but cannot start with http:// or https://.

The client token that ensures the idempotence of the request.

You can use the client to generate the token, but it must be unique across requests. The token can contain only ASCII characters.

Description If you do not specify this parameter, the system uses the request ID as the client token. The request ID may differ for each request.

Specifies whether to enable EIP affinity. Valid values:

• 0: no

• 1: yes

Description When enabled and multiple EIPs are associated with the SNAT entry, each client uses a fixed EIP for Internet access. When disabled, each client uses a random EIP.

The elastic network interface (ENI) ID.

Specifies whether to perform a dry run. Valid values:

• true: performs a dry run without creating an SNAT entry. The system checks AccessKey validity, RAM user authorization, and required parameters. If the check fails, the corresponding error is returned. If all checks pass, the DryRunOperation error code is returned.

• false (default): sends the request. If validation passes, a 2xx HTTP status code is returned and the SNAT entry is created.