A NAT subscriber is an internal entity whose true identity is hidden outside the network. The NAT subscriber is represented by a binding that is a set of stateful mappings between the internal and external representations of the subscriber. From the licensing perspective, the terms ‟NAT bindings” and ‟NAT subscribers” can be used interchangeably.
VSR-NAT collects the number of LSN subscribers for licensing purposes; the L2-Aware NAT subscribers are excluded from this count. An LSN subscriber is defined as follows:
Large Scale NAT44 (or CGN)
The subscriber is an internal IPv4 address.
DS-Lite
The subscriber is identified by the CPE IPv6 address (B4 element) or an IPv6 prefix. The selection of the address or prefix as the representation of a DS-Lite subscriber is configuration-dependent.
NAT64
The subscriber is an IPv6 address.
The number of LSN subscribers (LSN44, DS-Lite, and NAT64) in VSR-NAT is sampled every hour on the hour (for example, at 00:00 am, 01:00 am, 02:00 am, and so on). Each sample is a snapshot of the number of subscribers at the time that the statistics are collected.
The CLI can be used to view the following information:
24 samples (one per hour) in the current day
Maximum value for each of the last 7 days
Average value for each of the last 7 days
Maximum value since the system booted
For the list of CLI commands available for use, see VSR-NAT show command examples.