Loadbalancing and Sessions ?

I'm figuring out how to loadbalance two webservers with PHP-sessions and I want to hear some meanings of persons.

Example (I think this is the best one, there other software used in production):

You want to loadbalance two servers having both Squirrelmail installed on it.

You get this situation than:

HTML Code: 
                                           -------- Squirrelmail 1
                                          |
Internet -> Loadbalancer --
                                          |
                                           -------- Squirrelmail 2

Because you are using Squirrelmail with sessions I think you will have a problem with connecting loadbalanced with these boxes.

Do I need to install a SessionServer for this idea ? Or is there a possibilty to exchange the session between these two servers ?

Hope to see some ideas of you !

 

 

 

 

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