Really Confusing me ------------------------------- make menuconfig make install reboot make modules && make modules_install insmod sch_tbf --------------------------------- /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol qdisc_get_rtab /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol psched_time_base /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol unregister_qdisc /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol qdisc_put_rtab /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol register_qdisc /lib/modules/2.4.20/kernel/net/sched/sch_tbf.o: unresolved symbol psched_time_mark However, if i do not configuate it into module, it works.Using module, it won't install. Is the kernel 2.40.20 's fault?