SNAT source address, source port

Hey Folks,

I have a Citrix Gateway deployed behind a BigIP LTM, and I would like to track the connection of a certain user. I can see the source address, source port and the SNAT translation with this command:

conn server 151.x.x.x show all

So, I see that although the address is translated to one of the SNAT addresses in a pool of 7, the source port remains the same, so I can use the port to identify the user. The problem is when I have 8 port matches from 8 different connections. I guess the LTM is forced to change the port... How can I detect when this happens ?

Thanks, Fabian