The tmnxNatFwdTable contains the port forwarding entries
for NAT subscribers.
Entries in this table are created using the tmnxNatFwdAction
objects.
Entries in this table can expire,
or be removed using the tmnxNatFwdAction objects.
The information in this table is not saved in the configuration file,
but it can be made persistent across system reboot using the system
persistency mechanism.