WinPcap receives and sends the packets independently from the host protocols, like TCP-IP. This means that it isn't able to block, filter or manipulate the traffic generated by other programs on the same machine: it simply "sniffs" the packets that transit on the wire. Therefore, it does not provide the appropriate support for applications like traffic shapers, QoS schedulers and personal firewalls.

有人这样翻译：
WinPcap从主机的协议（如tcp/ip）独立收发数据包。 这意味着它不能阻塞、过滤或者处理同一主机上其他程序产生的数据包：它仅仅嗅探网线上传输的数据包。所以它不适合应用于流量均衡、QoS调度和个人防火墙。

偶觉得是这样：WINPCAP收发数据不依赖于主机协议，和具体协议（比如TCPIP）无关，因而不能阻塞、过滤或者处理本机其他程序的数据包。

对不对？