If the value of the object tmnxNatPlPortResvType is equal to 'ports',
the value of tmnxNatPlPortResvVal specifies the number of ports
in a port range.
If the value of the object tmnxNatPlPortResvType is equal to 'blocks',
the value of tmnxNatPlPortResvVal specifies in how many blocks
the whole ephemeral port range is split up.
The value of the object tmnxNatPlPortResvVal must be changed together
with the value of the object tmnxNatPlPortResvType.