> Hi, i´m working on a comparative analysis of the TCP implementations
> (Tahoe, Reno, NewReno, SACK).  I am trying to obtain these
> implementations under Linux

You're out of luck.  The licenses are incompatible enough that it is a
violation of at least one of them to distribute a Linux kernel with any
version of the BSD IP stack integrated.

If you want the real thing, you'll probably have to run a BSD variant.
You might be able to shoehorn the BSD stack into the Linux kernel;
provided you don't distribute the result, I *think* you should be OK
legally (though note that I'm not a lawyer).  But I'm not sure how much
point there would be.

/~\ The ASCII				der Mouse
\ / Ribbon Campaign
 X  Against HTML	       mouse@rodents.montreal.qc.ca
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B