NEIGH_VAR_BASE_REACHABLE_TIME_MS
neigh_vars_size = NEIGH_VAR_BASE_REACHABLE_TIME_MS + 1;
t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler;
t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler =