I can't see the use of windows net app in a Linux environment
All net features are given to you from command line and for advanced users
the tools like sockets programming to communicate in a lower level.
You could try nmap to see your chance of an successfull ip spoffing for a host :
nmap -O -v <host ip>
Then look for the Difficulty value from output
(if it say "Trivial Joke", then the host is vulnerable for ip spoofing)
see also IP-Spoofing Demystified