Function Overview

Public NAT Gateway
- Public NAT gateways provide NAT for servers in a VPC or on-premises servers that connect to the cloud through Direct Connect or Virtual Private Network (VPN), allowing multiple servers to share EIPs for Internet connectivity.
  
  Public NAT Gateway: All regions
  
  What is the Public NAT Gateway?
  
  Buying a Public NAT Gateway
Public NAT Gateway-Pay-per-use Billing Mode
- Public NAT gateways are billed based on the public NAT gateway type and service duration. There are four types of public NAT gateways: small, medium, large, and ultra-large. Public NAT gateways can be billed on a pay-per-use (day) basis.
  
  Public NAT Gateway: All regions
  
  Billing (Public NAT Gateway)
SNAT Rule
- Public NAT gateways support source NAT (SNAT) and destination NAT (DNAT).
  
  SNAT translates private IP addresses into EIPs, allowing servers within an AZ or across multiple AZs in a VPC to share EIPs to access the Internet.
  
  DNAT enables multiple servers within an AZ or across multiple AZs in a VPC to share EIPs to provide services accessible from the Internet. With an EIP, a NAT gateway forwards the Internet requests from only a specific port and over a specific protocol to a specific port of a server, or it can forward all requests to the server regardless of which port they originated on.
  
  Public NAT Gateway: All regions
  Private NAT Gateway: AP-Bangkok, AP-Singapore, China-Hong Kong, CN North-Beijing4, CN East-Shanghai1, CN East-Shanghai2, CN South-Guangzhou, Africa-Johannesburg, and Southwest-Guiyang1
  
  Adding an SNAT Rule (Public NAT Gateway)
DNAT Rule
- Public NAT gateways support source NAT (SNAT) and destination NAT (DNAT).
  
  SNAT translates private IP addresses into EIPs, allowing servers within an AZ or across multiple AZs in a VPC to share EIPs to access the Internet.
  
  DNAT enables multiple servers within an AZ or across multiple AZs in a VPC to share EIPs to provide services accessible from the Internet. With an EIP, a NAT gateway forwards the Internet requests from only a specific port and over a specific protocol to a specific port of a server, or it can forward all requests to the server regardless of which port they originated on.
  
  Public NAT Gateway: All regions
  Private NAT Gateway: AP-Bangkok, AP-Singapore, China-Hong Kong, CN North-Beijing4, CN East-Shanghai1, CN East-Shanghai2, CN South-Guangzhou, Africa-Johannesburg, and Southwest-Guiyang1
  
  Adding a DNAT Rule (Public NAT Gateway)
Enterprise Project
- NAT Gateway resources can be managed by enterprise project. You can add NAT Gateway resources to or remove NAT Gateway resources from an enterprise project. You must manage NAT Gateway resources based on the permissions granted with the user group you belong to.
  
  Public NAT Gateway: All regions
  Private NAT Gateway: CN North-Beijing4, CN East-Shanghai1, CN South-Guangzhou, CN Southwest-Guiyang1, China-Hong Kong, AP-Bangkok, AP-Singapore, and Africa-Johannesburg