You information is very old. mpd-3.13 & FreeBSD >=4.7 (new libradius only there) have dinamic (from RADIUS) IP assignement. There are 2 restrictions: 1) (as reported here) - mpd can not create more then 254 ng interfaces - so you will have no more then 254 simultaneous connections at a time.
You are wrong. On my PC mpd successfully can create more then 1000 ng interfaces. There are you only need to increase maximum count of file descriptors in system and change in mpd in file ppp.h constant FD_SETSIZE from 2048 to bigger value.
-- Alexander Motin [EMAIL PROTECTED] ISP Alkar-Teleport
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