Starting from October 1, 2020 until March 30, 2021, you can upgrade standard NAT gateways to enhanced NAT gateways free of charge.

Features of enhanced NAT gateways

Enhanced NAT gateways are upgraded from the technical architecture of standard NAT gateways and have the following features: higher performance, higher elasticity, flexible billing, and fine-grained maintenance. For more information, see 增强型NAT网关发布公告.
Note We recommend that you upgrade standard NAT gateways to enhanced NAT gateways. This way, you can better manage network traffic sent over the Internet.
Features of enhanced NAT gateways

Upgrade

Before you upgrade standard NAT gateways to enhanced NAT gateways, pay attention to the upgrade instructions in the following figure.
Note Only selected users in the following regions can not upgrade standard NAT gateways to enhanced NAT gateways: China (Beijing), China (Hangzhou), China (Shanghai) and China (Shenzhen).
Upgrade instructions

For more information about how to upgrade to enhanced NAT gateways, see Upgrade a standard NAT gateway to an enhanced NAT gateway.