tcp_scan and udp_scan are tools to scan a host for available networkservices (for example, to see if your packet filter does its job). Youcan scan specific services or ranges of ports.  In order to speed upthe process, the tools probe a bunch of network ports in parallel.The programs work with SunOS 4.1.3, SunOS 5.3 (Solaris 2.3) andprobably with anything that looks like 4.3+ BSD or System V.4.There is one catch, though: the programs use raw ICMP sockets, so theyneed to be run with root privilege. Raw ICMP sockets are used to workaround common shortcomings in BSD (75-second timeout on a non-blockingTCP connect() to an unreachable host) and in SYSV (a connected UDPsocket does not pass delivery errors back to the application).Warning: these programs will raise lots of alarms on sites that run mytcp wrapper or that do any other kind of network monitoring.  Use theprograms only with prior permission from the affected sites.	Wietse Venema