The tmnxNatLsnSubscIdStrTable associates subscriber strings
with Large Scale NAT subscribers.
The strings are taken from RADIUS messages according to
the configuration in the tmnxNatSubIdTable.
A subscriber string can be associated with more than one
Large Scale NAT subscriber.
Given a known subscriber string, this table provides the index values
to retrieve the inside information of (one or more) associated
Large Scale NAT subscribers, for example in the tmnxNatLsnHostTable.
Rows in this table are created and destroyed automatically
by the system.