Capture Client Connection DB Username and IP

 Is it possible to capture the client ip address/host name of a forms session using a database logon trigger.  It looks like sys.aud$ captures the host name of the ias web server but not the actual client ip address/host.  This is for ias 10.1.2.3.  On the forms server I've added  /session to the serverURL configuration parameter which does allow the ip to be written to a log file but it does not show the oracle username of the connection. 

Thanks,

Rick