There are several problems in BPF yet, one is: a BPF file that does not request promiscuous mode may receive promiscuously received packets as a side effect of another file requesting this mode on the same hardware interface.

• BPF还存在几个问题，其中一个问题是：在以太网的情况下，如果一个进程把网卡设置成混杂模式，另一个打开一个BPF文件但没有请求混杂模式的进程在此网卡上监听的时候，也会收到混杂模式下不是给本机的数据包。