Why am I unable to I buy a NAT bandwidth package in the NAT Gateway console?

If you didn't purchase any NAT bandwidth package for a NAT Gateway before 23:59 January 26, 2018, you can only associate Elastic IP Addresses (EIPs) with the NAT Gateway to provide public IP addresses for the NAT Gateway. For more information, see Associate an EIP with a NAT Gateway.

How many NAT bandwidth packages can be associated with a NAT Gateway?

By default, you can associate up to 4 NAT bandwidth packages with a NAT Gateway.

You can find the entry named natgw_quota_bandwidth_packages_num on the Quota Management page in the VPC console and apply for an increase.

What is the difference between a NAT bandwidth package and an Internet Shared Bandwidth instance?

A NAT bandwidth package is a resource that can only be associated with a NAT Gateway.

An Internet Shared Bandwidth instance can be associated with several types of cloud resources, such as Elastic Compute Service (ECS) instances and Server Load Balancers (SLBs).

What is the difference between a public IP address in a NAT bandwidth package and an EIP?

A public IP address in a NAT bandwidth package cannot be disassociated from a NAT Gateway.

An EIP can be associated with, or disassociated from, a NAT Gateway at any time.

Does the peak bandwidth of a NAT bandwidth package apply to both the inbound and outbound traffic?

The peak bandwidth of a NAT bandwidth package only applies a direct limit on the outbound traffic. However, the inbound traffic is also affected by the bandwidth.