NAT Gateway is an enterprise-class public network gateway that provides NAT proxy services (SNAT and DNAT), with the forwarding capacity of up to 10 Gbps, and the capability of cross-zone disaster recovery. The position of NAT Gateway in the VPC network topology is as shown in the following figure.
As a public network gateway, NAT Gateway needs to be configured with a public IP to function normally. After creating a NAT gateway, you can bind an EIP to it.
Note: If your account has a NAT bandwidth package before 23:59, January 16, 2018, you still need to use the bandwidth package to provide public IPs. Open a ticket if you want to bind EIP to the NAT gateway.