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Help Center/ NAT Gateway/ User Guide (Ankara Region)/ Getting Started/ Using a Public NAT Gateway to Enable Servers to Share One or More EIPs to Access the Internet

Using a Public NAT Gateway to Enable Servers to Share One or More EIPs to Access the Internet

Updated on 2025-01-10 GMT+08:00

Scenarios

If servers without EIPs need to access the Internet, they can share one or more EIPs to access the Internet through a public NAT gateway. This helps save EIP resources and protect servers from exposing their IP addresses.

Operation Process

Procedure

Description

Step 1: Buy an EIP

Buy an EIP.

Step 2: Buy a Public NAT Gateway

Buy a public NAT gateway.

Step 3: Add an SNAT Rule

Add an SNAT rule for the public NAT gateway so that servers in specific CIDR blocks share the EIP you have assigned to access the Internet.

Step 4: Verify that the SNAT Rule Has Been Added

Check whether the SNAT rule has been added.

Step 5: Verify that Server Can Access the Internet Through the NAT Gateway

Verify that server in the CIDR block to which the SNAT rule is applied can access the Internet.

Step 1: Buy an EIP

  1. On the Assign EIP page, set the EIP name to EIP-A.

    You can configure other EIP parameters as required. For details, see .

Step 2: Buy a Public NAT Gateway

  1. On the Create Public NAT Gateway page, configure required parameters.
    Table 1 Descriptions of public NAT gateway parameters

    Parameter

    Example

    Description

    Region

    CN North-Beijing4

    The region where the public NAT gateway is located.

    Specifications

    Small

    The specifications of the public NAT gateway.

    The value can be Extra-large, Large, Medium, or Small. To view more details about specifications, click Learn more on the page.

    Name

    public-nat-01

    The name of the public NAT gateway. Enter up to 64 characters. Only letters, digits, underscores (_), hyphens (-), and periods (.) are allowed.

    VPC

    vpc-A

    The VPC that the public NAT gateway belongs to.

    The selected VPC cannot be changed after you create the public NAT gateway.

    NOTE:

    To allow traffic to pass through the public NAT gateway, a route to the public NAT gateway in the VPC is required. When you create a public NAT gateway, a default route 0.0.0.0/0 to the public NAT gateway is automatically added to the default route table of the VPC. If the default route 0.0.0.0/0 already exists in the default route table of the VPC before you create the public NAT gateway, the default route that points to the public NAT gateway will fail to be added automatically. In this case, perform the following operations after the public NAT gateway is successfully created: Manually add a different route that points to the gateway or create a default route 0.0.0.0/0 pointing to the gateway in the new routing table.

    Subnet

    Subnet-A01

    The subnet that the public NAT gateway belongs to.

    The subnet must have at least one available IP address.

    The selected subnet cannot be changed after you create the public NAT gateway.

    The NAT gateway will be deployed in the selected subnet. The NAT gateway works for the entire VPC where it is deployed. To enable communications over the Internet, add SNAT or DNAT rules.

    Advanced Settings (Optional)

    -

    Click the drop-down arrow to configure advanced parameters of the public NAT gateway.

    SNAT Connection TCP Timeout (s)

    900

    The timeout period of a TCP connection established using the SNAT rule. If no data is exchanged within this period, the TCP connection will be closed.

    Value range: 40 to 7200

    SNAT Connection UDP Timeout (s)

    300

    The timeout period of a UDP connection established using the SNAT rule. If no data is exchanged within this period, the UDP connection will be closed.

    Value range: 40 to 7200

    SNAT Connection ICMP Timeout (s)

    10

    The timeout period of an ICMP connection established using the SNAT rule. If no data is exchanged within this period, the ICMP connection will be closed.

    Value range: 10 to 7200

    TCP TIME_WAIT (s)

    5

    How long the side that actively closed the TCP connection is in the TIME_WAIT state.

    Value range: 0 to 1800

    Description

    Not required

    Supplementary information about the public NAT gateway. Enter up to 255 characters. Angle brackets (<>) are not allowed.

    Tag

    Not required

    The identifier of the public NAT gateway. A tag is a key-value pair. You can add up to 20 tags to each public NAT gateway.

  2. Click Create Now. On the page displayed, confirm the public NAT gateway specifications.
  3. If you do not need to modify the information, click Submit.

    On the Public NAT Gateways page, you can view the created public NAT gateway in the list.

Step 3: Add an SNAT Rule

  1. On the displayed page, click the name of the public NAT gateway on which you need to add an SNAT rule.
  2. On the SNAT Rules tab, click Add SNAT Rule.
  3. Configure required parameters. Table 2 describes the parameters.
    Table 2 Descriptions of SNAT rule parameters

    Parameter

    Example

    Description

    Scenario

    VPC

    Select VPC if your servers in a VPC will use the SNAT rule to access the Internet.

    Different servers in a VPC can share the same EIP to access the Internet.

    CIDR Block

    Existing

    The CIDR block is a subset of the NAT gateway's VPC subnets. Servers whose IP addresses in the CIDR block can access the Internet through the SNAT rule.

    Select a CIDR block from the drop-down list.

    Public IP Address Type

    EIP

    The EIP used for accessing the Internet.

    Monitoring

    -

    You can create alarm rules on the Cloud Eye console to monitor your SNAT connections and keep informed of any changes in a timely manner.

    Description

    Not required

    Supplementary information about the SNAT rule. Enter up to 255 characters. Angle brackets (<>) are not allowed.

  4. Click OK.

Step 4: Verify that the SNAT Rule Has Been Added

  1. In the SNAT Rules tab, view details of the SNAT rule.
    If Status of the SNAT rule is Running, the SNAT rule has been created.
    Figure 1 Verifying that the SNAT rule has been added

Step 5: Verify that Server Can Access the Internet Through the NAT Gateway

  1. Log in to the server to be verified.
  2. Verify that the server can access the Internet.
    Figure 2 Verification result

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