Adding a DNAT Rule

After a public NAT gateway is created, add DNAT rules to allow servers in your VPC to provide services accessible from the Internet.

1. Log in to the management console.
2. Click in the upper left corner and select the desired region and project.
3. In the upper left corner of the page, click to expand the service list and choose Network > NAT Gateway.

   The Public NAT Gateways page is displayed.

4. On the displayed page, click the name of the public NAT gateway on which you need to add a DNAT rule.
5. On the public NAT gateway details page, click the DNAT Rules tab.
6. Click Add DNAT Rule.
7. Configure required parameters. For details, see Table 1.

   Table 1 Descriptions of DNAT rule parameters

   Parameter	Description
   Scenario	Select VPC if your servers in a VPC will use the DNAT rule to share the same EIP to provide services accessible from the Internet. Direct Connect: Select this scenario if your on-premises servers will use the DNAT rule to provide services accessible from the Internet.
   Port Type	The port type. All ports: The public NAT gateway directs all inbound requests received by the EIP to the private IP address of the destination cloud server. Specific port: The public NAT gateway forwards inbound requests intended for the EIP over specified ports and protocol to specified ports of the destination cloud server.
   Protocol	The protocol can be TCP or UDP. This parameter is available if you select Specific port for Port Type. If you select All ports, the value of this parameter is All by default.
   Public IP Address Type	The EIP that will be used by the server to provide services accessible from the Internet. You can select an EIP that either has not been bound, has been bound to a DNAT rule of the current public NAT gateway with Port Type set to Specific port, or has been bound to an SNAT rule of the current public NAT gateway.
   Public Port	The port of the EIP used by the NAT gateway for external communications. This parameter is only available if you select Specific port for Port Type. Range: 1 to 65535 You can enter a specific port number or a port range, for example, 80 or 80-100.
   Instance Type	The type of the instance that will be providing services accessible from the Internet. Possible values are: Server Virtual IP address Custom
   NIC	The NIC of the server. This parameter is available if you set Instance Type to Server.
   Private IP Address	In a VPC scenario, this parameter can only be set to the private IP address of a server in the NAT gateway's VPC. The server will provide services accessible from the Internet through DNAT. In a Direct Connect scenario, set this parameter to the IP address of the server in your on-premises data center or your private IP address. This IP address is used by on-premises servers that are connected to a VPC through Direct Connect to provide services accessible from the Internet through DNAT. Configure the port of Private IP Address if you select Specific port for Port Type.
   Private Port	The port of the server over which the originating requests will be forwarded. This parameter is only available if you select Specific port for Port Type. Range: 1 to 65535 You can enter a specific port number or a port range, for example, 80 or 80-100.
   Description	Provides supplementary information about the DNAT rule. Enter up to 255 characters. Angle brackets (<>) are not allowed.

8. Click OK.

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