Problems Internet Connection Sharing using PCLinuxOS and I-Burst

Symptoms:
The Windows client machines will have limited connectivity,
i.e. MSN won't work, and some sites will time out (Usually HTTPS sites),
Some machines may even connect perfectly

Solution:
Download TCP Optimizer from http://www.speedguide.net/downloads.php
and set the MTU to that advised by your iburst service provider (I use 1321 or 1392) for every machine

(Alternatively there is a way to recompile the kernel so that this problem doesn't occur, but forgot Embarrassed )