wINJECT is creates customised packets. It is also far superior to 'hping' (not only being able to run in the Windows environment) as it can run "projects", i.e. a series of differing packets.

thanks... im just starting to learn tcpip and that sure can help.
ps.
does anybody have good papers on using SNIFFER PRO or maybe a demonstartion
of how does a packet gets to a place ?

This tool is a pretty good one
Thanks a lot dude