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SARG:How to resolve username into IP

Hi all,
Any idea to resolve username into IP address in Sarg report
I am running a squid server and preparing a User Based Access Level report using Sarg.
Here all the clients in the LAN are using Dowload Accelerator Software(DAP 8.0).When downloading through DAP the squid server prompts for authentication.
So for the convenience of users I added a user named "dap" and set it as the default user in DAP Settings.
So I don't need username "dap" in the sarg report.
Instead I would like to see the IP address of the machine from which Download occured.

Any idea.......
Thanks in advance

Oh I just described quite unclearly.
Actually all the clients are authenticated using their own user name and password,I don't want to resolve those usernames into IP.
All I need is to resolve the special user "dap" to IP,only for "dap".