Getting source IP for FTP VS with SNAT

Hello,

 

We have a pair of BIG-IP appliances (10.2.2 Build 763.3 Final) configured with one FTP VS (used for incoming FTP). The VS is SNATed, because customers access it via VPN tunnels hence no routable IPs.

 

Is there any way to extract (and log) the source IP address of incoming FTP connection? Ideally, if we can log the whole FTP session and send it via syslog that would be great.

 

Any hints are greatly appreciated.

 

Thanks.