@param vfr_id - VRF ID
@param twice_nat - if 1 translate external host address and port, only for
1:1 NAPT (addr_only must be 0)
@param vfr_id - VRF ID
@param twice_nat - if 1 translate external host address and port, only for
1:1 NAPT (addr_only must be 0)
@param external_sw_if_index - external interface
@param vfr_id - VRF ID
@param twice_nat - if 1 translate external host address and port
@param external_sw_if_index - external interface
@param vfr_id - VRF ID
@param twice_nat - if 1 translate external host address and port