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linux下的ppp协议簇开源代码； 可以进行linux内核级的pppoe拨号

The files ans.c, atm.h, atmres.h, atmsap.h, misc.c, text2atm.c  and
text2qos.c are taken from the linux-atm libraries.  These are 
Copyright 1995-2000 EPFL-LRC/ICA, and are licensed under the GNU Lesser
General Public License.

The file pppoatm.c contains its own copyright notice, and is licensed
under the GPL.