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
主页：http://nast.berlios.de/
下载：http://nast.berlios.de/#DOWNLOAD
来自:开源中国社区
