Nast is a packet sniffer and a LAN analyzer. It sniff packets and save data in files, checks NIC in promisc mode,build LAN hosts list, find a gw,performs a port scanning, catchs daemon banner etc... It also provides a GTK/ncurses interface.
This project implements IPSec as NDIS Intermediate filter driver in Windows 2000. This IPSec driver appears as Virtual NIC to protocol drivers like TCP/IP driver. The network applications need not be aware of the existance of this IPSec driver