This topic describes how to upgrade or downgrade a NAT gateway. You can change the size of a NAT gateway without affecting the workloads.

Background information

NAT gateways are available in multiple sizes, including small, middle, large, and super large-1. The size of a NAT gateway determines the maximum number of Source Network Address Translation (SNAT) connections and the number of new SNAT connections per second (CPS). However, Destination Network Address Translation (DNAT) is not affected by the sizes of NAT gateways. The following table lists the available sizes of NAT gateways.
Type Maximum number of SNAT connections Number of new SNAT connections per second
Small 10,000 1,000
Middle 50,000 5,000
Large 200,000 10,000
Super Large-1 1,000,000 50,000


  1. Log on to the NAT Gateway console.
  2. In the top menu bar, select the region where the NAT gateway is deployed.
  3. On the NAT Gateway page, find the NAT gateway that you want to manage, and choose More > Upgrade/Downgrade in the Actions column.
  4. On the Upgrade/Downgrade page, set the following parameters to change the size of the NAT gateway, click Buy Now, and then complete the payment.
    Parameter Description
    Specification Select the size of the NAT gateway.
    Note You can upgrade or downgrade the size of the NAT gateway.
    Terms of Service Select NAT Gateway (Pay-As-You-Go) Terms of Service.