The latest version of the network code can be obtained by
anonymous FTP from various sites. The official FTP site for Net-3 is
sunacm.swan.ac.uk, mirrored by sunsite. The latest Net-2e patch kit and
binaries are available from ftp.aris.com. Matthias Urlichs'
BSD-derived networking code can be gotten from here.
The latest kernels can be found on here; sunsite and
tsx-11.mit.edu mirror this directory.