Help with Tracing

Hi Experts-

I've been searching here & MS site with no luck so far, I hope you can help me out.

We use tracing to monitor the use of the SQL Database instances on multiple machines. One of the functional uses is to evaluate "who" logged in from "where" with "what" application, in order to isolate the events we are concerned with from those that are related to routine use of an application. (I should add that similar functionality is used on all versions, this isn't restricted to 2000/2005/2008).

The problem we've identified is that when making a connection to SQL, the client system can change the identified machine name and/or application used, as presented to SQL; therefore there is no assurance that the application identified or the hostname used and logged, is valid.

Does anyone know of a simple way to capture the actual IP address of the client machine (whether an app server or workstation, we use both) on connection, either in addtion to or in place of the 'HostName' column?

Here is our current trace setup:

select @str1 =
'Audit Login,'+
'Audit Logout,'+
'Audit Login Failed,'+
'Audit AddLogin Event,' +
'Audit Login Change Property Event,'+
'Audit Login Change Password Event,' +
'Audit Add Login to Server Role Event,'+
'Audit Add DB User Event,'+
'Audit Add Member to DB Role Event,'+
'Audit Add Role Event,'+
'Audit Object Derived Permission Event,'+
'ExistingConnection,',

-- List the columns you want to capture
@str2 =
'TextData,'+
'DatabaseID,'+
'DatabaseName,'+
'NTUserName,'+
'HostName,'+
'ApplicationName,'+
'LoginName,'+
'SPID,'+
'StartTime,'+
'EndTime,'+
'Permissions,'+
'ServerName'