Network Analyzer Sniffer Tool (nast) 是一个网络包嗅探和局域网分析工具，基于 libnet 和 libpcap 开发。
nast can sniff in normal mode or in promiscuous mode the packets on a network interface and log it. It dumps the headers of packets and the payload in ascii or ascii-hex format. You can apply a filter. The sniffed data can be saved in a separated file.
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