to whoever said ...

F5's if you like commercial solutions

F5s if you like expensive commercial solutions ..... Those with a less bulging wallet may wish to speak to the guys at Zeus Technology (http://www.zeus.com/) who have a lot of experience in the area and a more reasonable price tag. Contact me off-list and I can give you some names of senior techies there to speak to. (usual disclaimer that you should research your products .... it may be that for your particular application/environment/business model/whatever F5 may be your tool of choice)