Nast is a packet sniffer and a LAN analyzer based
on Libnet and Libpcap. It can sniff the packets on
a network interface in normal mode or in
promiscuous mode. It dumps the headers of packets
and the payload in ASCII or ASCII-hex format.
Various packet filters can be applied. The data
sniffed can be saved in a separate file. As an
analysis tool, it can check for other NICs on the
network which are set in promiscuous mode, build a
list of all hosts on a LAN, find a gateway,
perform port scanning on a multiple hosts, catch
daemon banners, follow the TCP data stream, reset
a connection, and determine whether a link type is
a hub or switch.
