+It is not advisable to unload the "if_ppp" module, because it creates
+network interface units, and SunOS does not provide any way to destroy
+network interfaces once created. If you do unload it, the system will
+probably crash at some later stage.
+
+If you have previously had ppp-2.2 installed, you may have statements
+in your /etc/rc.local to load the ppp module. You will need to remove
+those. Having done this, you will need to reboot to remove the old
+ppp module and load the new modules.