The latest MAGNeT patch is contained in a file by the name:

magnet-<MAGNeT version>-kernel-<kernel version>.patch

This patch installs the code for MAGNeT version <version> into the kernel
version <kernel version> source tree.  To apply, copy the MAGNeT patch file
to the base (ie, /linux) directory of the kernel source tree at enter the
command:

patch -p1 < <magnet_patch_file_name>

This should apply the patch.  Further documentation is found in
Documentation/magnet.txt and Documentation/magnet-install.txt after the 
patch has been applied.

To create the application programs, execute the following commands after 
successfully building a kernel with MAGNeT enabled:  (from the kernel source
tree base [ie, /linux)]:

make net/magnet/magnet-read
make net/magnet/magnet-parse
make net/magnet/mkmagnet

--- Current MAGNeT Patches ---
Last updated: Sep 26, 2001

MAGNeT VERSION 1.0.1 *NOT* to be distributed outside of LANL
magnet-1.0.1-kernel-2.4.8	- Created against Linux 2.4.8 source tree
				- Known to apply on 2.4.6 - 2.4.9
magnet-1.0.1-kernel-2.4.5	- Created against Linux 2.4.5 source tree
				- Known to apply on 2.4.4 - 2.4.5

magnet-1.0.2-kernel-2.4.8	- Created against Linux 2.4.8 source tree
				- Known to apply on 2.4.6 - 2.4.10
magnet-1.0.2-kernel-2.4.5	- Created against Linux 2.4.5 source tree
				- Known to apply on 2.4.4 - 2.4.5