doc-exports/docs/natgw/umn/nat_qs_0017.html

Step 4: Add an SNAT Rule

Scenarios

After a NAT gateway is created, you can add SNAT rules for it. With SNAT rules, servers that are connected to a VPC using Direct Connect can access the Internet by sharing an EIP.

An SNAT rule is configured for one CIDR block. If servers that are connected to a VPC using Direct Connect are in multiple CIDR blocks, you can create several SNAT rules to make the servers share one or more EIPs.

Prerequisites

A NAT gateway has been created.

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	Description
   Scenario	Select Direct Connect if servers in your data center need to access the Internet. The servers in your data center that are connected to a VPC through Direct Connect or VPN can access the Internet through the SNAT rule.
   CIDR Block	On-premises servers whose IP address in this CIDR block can access the Internet through the SNAT rule.
   EIP	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.
8. View details in the SNAT rule list. If Status is Running, the rule has been added.
   

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

Parent topic: Using SNAT and DNAT Rules to Allow On-premises Servers to Communicate Over the Internet