SendIP

SendIP is a commandline tool to allow sending arbitrary IP packets. 

Features

SendIP has a large number of command line options to specify
the content of every header of a RIP, TCP, UDP, ICMP or raw
IPv4 and IPv6 packet. It also allows any data to be added to
the packet. Checksums can be calculated automatically, but
if you wish to send out wrong checksums, that is supported too. 

Documentation

SendIP now comes with a manpage, as well as the README file.
The source is also quite readable... ;) 

Licence

SendIP is distributed according to the GNU Public Licence and
was written by Mike Ricketts. 

The SenIP homepage is located at:

	http://www.earth.li/projectpurple/progs/sendip.html