NAT Gateway is an enterprise-class public network gateway that provides NAT proxy services (SNAT and DNAT), up to 10 Gbps forwarding capacity, and cross-zone disaster recovery.
As a public network gateway, NAT Gateway requires configured public IPs and bandwidth. Public IPs for NAT Gateway are grouped into abstract groups called shared bandwidth packages.
NAT Gateway and shared bandwidth packages together provide a high-performance, flexible, and enterprise-class public gateway service.
The position of NAT Gateway in the VPC network topology is as shown in the following figure.
|Items||NAT Gateway||Elastic IP|
|Supported network environment||VPC||VPC|
|Supports sharing bandwidth among multiple IPs?||Yes||No|
|Supports unbinding from ECS?||Yes||Yes|
|Supports binding one IP to multiple ECS instances?||Yes||No|
|Can be viewed on the ECS NIC?||No||No|
|Configuration method||SNAT and DNAT (port mapping/IP mapping)||One-to-one mapping|
|Typical users||Enterprise users with many ECS instances and large number of public IPs||Users with less ECS instances and small number of public IPs|