MkLinux
Grab ppp-2.2.0f-2.ppc.rpm from
                        
http://ftp.sunet.se/pub/os/Linux/mklinux/mkarchive/comm/connecting/ppp-2.2.0f-2.ppc.rpm

and then install it by doing a
"rpm -i --force ppp-2.2.0f-2.ppc.rpm"

Make sure your modem setup file at 
/etc/ppp/ppprc.cuaX has a '\n' after the CONNECT.

Linux-pmac
You're running the wrong pppd. Linux-pmac and MkLinux require different
versions of pppd.If you're running linux-pmac, get the right
one off of cap.anu.edu.au.

jonh@cs.dartmouth.edu