You are in luck. Cisco TAC just recently sent out this link for that very reason:
http://www.cisco.com/warp/public/471/mod-aux-exec.html
As always, I recommend that you skip the text versiona and go strait for the PDF file (upper right hand corner of the page)
Let me know if you have any questions. Remember that a lot of folks configure their router correctly and neglect their modem config.
Good luck,
Scott