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.
主要特点：
- Build LAN hosts list
- Follow a TCP-DATA stream
- Find LAN internet gateways
- Discover promiscuous nodes
- Reset an established connection
- Perform a single half-open portscanner
- Perform a multi half-open portscanner
- Find link type (hub or switch)
- Catch daemon banner of LAN nodes
- Control arp answers to discover possible arp-spoofings
- Byte counting with an optional filter
- Write reports logging
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