Load Balancer and IPs problem

[PietroAvolio]

Hi, I'm new to this community and I hope this is the right section!

However, this is my problem: i've succesfully setup a loadbalancer on two lines and it's working as expected.
The only problem is that a user can change ip multiple times while navigating (e.g: if i refresh this page http://www.whatismyip.com/ it shows different IPs depending on what connection the load balancer has chosen to use) and this is a big problem because many sites on the web use sessions based on IP and the main result is an impossible internet navigation.

I've searched a lot online but I've got no useful results (maybe because I don't google the right words, but  :-P).

I hope someone could help me!

Pietro