Hi, all who can tell me why? I think is should be 256 also. #ifdef CONFIG_IP_ROUTE_MULTIPATH #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) #define FIB_TABLE_HASHSZ 2 #else /* CONFIG_IP_ROUTE_MULTIPATH */ #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) #define FIB_TABLE_HASHSZ 256 #endif /* CONFIG_IP_ROUTE_MULTIPATH */ Thanks