Here's another simple way to install llrnet on 2, 4 and 8 cores machine.
The default server is on port 5000 but you also have work on port 400 and little work on port 7500 (almost drying). To change the port just edit llr-clientconfig.txt for all cores and look for the server location. Another thing you have to edit is your nickname, please look for the line username = "TeamName_nickname".

llr-clientconfig.txt content:
--
-- LLRNet - network part of LLR
--
-- (C) 2004-2005 Vincent Penne
--
-- Released under GNU LIBRARY GENERAL PUBLIC LICENSE
-- (See file LICENSE that must be included with this software)
--
-- CLIENT CONFIGURATION FILE
--
-- WARNING: comments start with two dashes

-- server location
server = "nplb.ironbits.net"
port = 5000

-- username
username = "nickname"
Extract the zip, for 2 and 4, versions and unrar for the 8 version. To run the client you just need to run llrnet.exe respectively for each core.

Links to download:

http://em99010pepe.googlepages.com/l...2_NPLB_win.zip (Core duo windows)
http://em99010pepe.googlepages.com/l...4_NPLB_win.zip (Quad-core windows)
http://em99010pepe.googlepages.com/l..._win.part1.rar (Octo part 1 windows)
http://em99010pepe.googlepages.com/l..._win.part2.rar (Octo part 2 windows)

All clients will run in the system tray. If you right click on the icon and if you choose "New GUI Window" you will get remotely control of all cores and see their progress.

Hope this helps a bit.

Carlos