ifr_metric
ifr.ifr_metric = metric;
else if (ifr.ifr_metric != 0)
printf(" metric %d", ifr.ifr_metric);
ifs.int_metric = ifr.ifr_metric;
ifr->ifr_metric = ifp->if_metric;
ifp->if_metric = ifr->ifr_metric;
ifcp->ifc_metric = ifr.ifr_metric;