The port assigned to this NAT Translation Protocol
entry. A value of '0' indicates any port is allowed for this
NAT Translation Protocol entry. An entry in
etsysNatTranslationProtocol of either TCP(6) or UDP(17)
may contain a non-zero value in this entry indicating the
specific port assigned for this protocol. Any other value
in etsysNatTranslationProtocol requires that this entry be
set to '0'.