Limit NAT IP bandwidth for a VDC

You can use Quality of Service (QoS) traffic shaping parameters to limit the bandwidth for all the NSX NAT IPs in a virtual datacenter. 

When you create a virtual datacenter, the new "natbandwidthlimit" attribute is present but you must edit the virtual datacenter to enable it in the platform and in the NSX. 

To edit the bandwidth limit and apply it in the NSX:

1. Select the virtual datacenter and go to Network → QoS
2. Click the pencil edit button 
   1. To enable the bandwidth limit in a specific direction, select the Enabled checkbox for that direction
   2. Set QoS values for your virtual datacenter. Be sure to allow enough bandwidth to share between all the NAT IPs in the virtual datacenter.

For more details see GUI Edit NAT bandwidth limit

To register changes that were made outside the platform, save existing NAT bandwidth values. In the API, to register changes, send a POST request with the existing values.