Network Stuff

Network Stuff is a portable collection of essential networking tools that include a TCP/UDP/CGI port scanner, Whois lookup, DNS resolve, TCP/IP statistics, IP to MAC address conversion (ARP), Wake On LAN and an ICMP ping tool.  In addition, the program also includes a RAW packet sniffer, a transparent proxy server and generic client/server modules that allow you to test TCP and UDP communications.

http://jacquelin.potier.free.fr/networkstuff/