std::shared_ptr<interface> itf = interface::find(payload.sw_if_index);
if (itf) {
nat_binding nb(*itf, direction_t::OUTPUT, l3_proto_t::IPV4,
std::shared_ptr<interface> itf = interface::find(payload.sw_if_index);
if (itf) {
nat_binding nb(*itf, direction_t::OUTPUT, l3_proto_t::IPV4,