In order to use anything but the most primitive functions of ATM, several user-mode programs are required to assist the kernel. These programs and related material can be found via the ATM on Linux Web page at http://linux-atm.sourceforge.net/
If you encounter problems with ATM, please report them on the ATM on Linux mailing list. Subscription information, archives, etc., can be found on http://linux-atm.sourceforge.net/