Nast是一个基于Libnet 和Libpcap的sniffer包和LAN分析器。它可以在通常模式或混合模式下检查通过网络接口的数据包，并将包头和净荷以ASCII或ASCII- 十六进制格式转储。可以使用各种包过滤器。经过检查的数据可以保存在一个单独的文件中。作为一个分析工具，它可以检查网络上设置为混合模式的其它NIC，建立LAN上的所有主机的列表，捕获后台程序标志，转发TCP数据流，重置一个连接，决定一个链接类型是集线器还是交换机。-Nast is based on one of Libnet and Libpcap packet sniffers and LAN analyzer. It usually mode or in a mixed mode inspection of the network interface data packets and Baotou and payload, or ASCII to ASCII- hexadecimal format dump. Can the use of packet filters. After inspection data can be stored in a separate document. As an analytical tool, it can check on the network is set to a mixed mode of other NIC, established on the LAN list of all hosts, background capture procedures signs TCP transmitted data stream, re-connecting a decision is a type of link hubs or switches.