N_IFNET
intpr(interval, nl[N_IFNET].n_value, NULL, nl[N_NCPUS].n_value);
intpr(interval, nl[N_IFNET].n_value,
if (nl[N_IFNET].n_value == 0) {
printf("symbol %s not found\n", nl[N_IFNET].n_name);
KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);