Adding an SNAT Rule

Scenarios

After a NAT gateway is created, add SNAT rules. With the SNAT rule, servers in a VPC subnet or servers that are connected to a VPC through Direct Connect or VPN can access the Internet by sharing an EIP.

Each SNAT rule is configured for one subnet. If there are multiple subnets in a VPC, you can create several SNAT rules to share EIPs.

Prerequisites

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select the desired region and project.
  3. Under Network, choose NAT Gateway.
  4. On the displayed page, click the name of the NAT gateway for which you want to add the SNAT rule.
  5. On the SNAT Rules tab, click Add SNAT Rule.

    Figure 1 Add SNAT Rule
  6. Configure the parameters as prompted. For details, see Table 1.
    Table 1 Parameter descriptions

    Parameter

    Condition

    Description

    Scenario

    N/A

    The scenarios where the SNAT rule is used.

    Select VPC if your servers in a VPC need to access the Internet.

    Select Direct Connect if the servers that are connected to a VPC through Direct Connect in your data center need to access the Internet.

    Type

    This parameter is available only when you select VPC for Scenario.

    You can set it to Subnet or Custom based on service requirements.

    Select Subnet if all servers in a VPC subnet need to access the Internet through the SNAT rule.

    Select Custom if only specific servers in a VPC subnet need to access the Internet through the SNAT rule.

    Subnet

    This parameter is available only when you select VPC for Scenario, and Subnet for Type.

    The subnet in which servers can access the Internet through the SNAT rule.

    EIP
    • This parameter is available only when you select VPC for Scenario.
    • This parameter is available only when you select Direct Connect for Scenario.

    The EIP used for accessing the Internet.

    You can select an EIP that either is not bound to any resource, has been bound to a DNAT rule with Port Type set to Specific port of the current NAT gateway, or has been bound to an SNAT rule of the current NAT gateway.
  7. Click OK.

    You can add multiple SNAT rules for a NAT gateway to suite your service requirements.

Parent topic: Managing SNAT Rules