If it's of any use, there's a good description of the various TCP/IP (and
other) updates at the WarpUpdates International website, http://www.warpupdates.mynetcologne.de/english/warpupdates.html .
Go to the Table of Contents, then TCP/IP Components. The latest was
TCP/IP 4.32, but I don't know where these would be available without
a support contract at this point...