I am at work and can't give you a model number. All I have is Cisco Linkys Router E1200. I have AT&T DSL. If you need a model number, I will have to give it to you tomorrow. Sorry.
Here's the rest of the information you requested re my modem:
For advanced configuring go to htp://192.168.1.254
I look forward to your response.
Note: if these instructions do not apply to your modem, please go to http://www.att.com/esupport/article.jsp?sid=KB401538#fbid=YbPvVnDo9fz, and scroll down for another instructions.