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Adding a DNAT Rule

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

Scenarios

After a private NAT gateway is created, you can add DNAT rules to allow servers in your VPC to provide services accessible from on-premises servers or other VPCs.

A DNAT rule needs to be configured for each port on a server that needs to be made accessible. If multiple ports on a server or multiple servers need to provide services accessible from on-premises servers or other VPCs, multiple DNAT rules need to be configured.

Notes and Constraints

A DNAT rule with Port Type set to All ports cannot share a transit IP address with a DNAT rule with Port Type set to Specific port.

Prerequisites

  • A private NAT gateway is available.
  • A transit IP address is available.

Procedure

  1. On the Private NAT Gateways page, click the name of the private NAT gateway on which you need to add a DNAT rule.
  2. On the private NAT gateway details page, click the DNAT Rules tab.
  3. Click Add DNAT Rule.
    NOTICE:

    After you add a DNAT rule, add rules to the security group associated with the servers to allow inbound or outbound traffic. Otherwise, the DNAT rule does not take effect.

  4. Configure required parameters. For details, see Table 1.
    Table 1 Descriptions of DNAT rule parameters

    Parameter

    Description

    Local Network

    Port Type

    The port type

    The type can be:

    • Specific port: The private NAT gateway only forwards requests to your servers from the outside port and to the inside port configured here, and only if they use the right protocol.
    • All ports: All requests received by the gateway through all ports over any protocol will be forwarded to the private IP address of your server.

    Protocol

    The protocol can be TCP or UDP

    If you select All ports, the value of this parameter is All by default.

    This parameter is only available if you select Specific port for Port Type.

    Instance Type

    The type of instance that will provide services accessible from on-premises data centers or other VPCs

    Possible types are:

    • Server
    • Virtual IP address
    • Load balancer
    • Custom

    NIC

    The NIC of the server

    This parameter is only available if you set Instance Type to Server.

    IP Address

    The IP address of the server that will provide services accessible from on-premises data centers or other VPCs. This parameter is only available if you set Instance Type to Custom.

    Internal Port

    The port of the instance

    Range: 1 to 65535

    This parameter is only available if you select Specific port for Port Type.

    Transit Network

    Transit IP Address

    The transit IP address used to access on-premises data centers or other VPCs

    You can select a transit IP address that is not bound to any resource, has been bound to a DNAT rule for the current private NAT gateway where Port Type is set to Specific port, or has been bound to an SNAT rule of the current private NAT gateway.

    Transit IP Address Port

    The port of the transit IP address Supported range: 1 to 65535

    This parameter is only available if you select Specific port for Port Type.

    Description

    Provides supplementary information about the DNAT rule. Enter up to 255 characters. Angle brackets (<>) are not allowed.

  5. Click OK.

    Once the rule is created, its status changes to Running.

Helpful Links

Managing DNAT Rules

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