If the "AT&T modem" is indeed a DSL modem.  The issue may be one related to
dialing the access number.  If you only use the modem:

wall --> modem --> computer

then you would need to have some sort of PPPoE (point to point protocol over
ethernet) software to make the connection.  In this event, you may have
installed some software to perform this function on Windows.  Obviously, Linux
would know nothing about this.

It is generally better/safer to include some kind of router between the modem
and the computer:

wall --> modem --> router --> computer

This offers several advantages.  One is that most consumer routers (wireless or
wired) include a firewall to block incoming server requests (SYN) on all ports
except those you specifically open.  A second advantage is that multiple
computers may access the Internet through this connection.  

Probably the most relevant here is that the router can be configured to act as
the PPPoE client (needs the phone number, username, password for your AT&T
account).  It acts keeps the connection up and dials when necessary.  The
computers in your network get their IP address via DHCP.  The computers using
the router do not need a PPPoE client program.

This may not explain why your connection would show up after multiple restarts
of the machine.  However if you never get a connection with Linux, then it
could be the issue.

If this is a regular telephone modem (not DSL) then most likely the modem in
your machine is part of the motherboard and is what is called a WinModem. 
These rely on the operating system software to supply some of the
functionality.  This can be a problem for Linux in many cases.  Some of these
WinModems can be run with information found on http://www.LinModem.org but a
cable or DSL connection is preferred if you can afford it.

James

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