The value of tmnxNat64InIgnoreTos specifies
if the IPv4 Type Of Service (TOS) is ignored and the
IPv6 Traffic Class bits set to zero.
If the value of tmnxNat64InIgnoreTos is equal to 'false', the system
copies the IPv4 TOS into the IPv6 Traffic Class.
The value of this object can only be modified while the value of
the object tmnxNat64InAdminState is equal to 'outOfService'