-The normal way that pppd should be set up is to have the \fIauth\fR
-option in the /etc/ppp/options file. (This may become the default in
-later releases.) If users wish to use pppd to dial out to a peer
-which will refuse to authenticate itself (such as an internet service
-provider), the system administrator should create an options file
-under /etc/ppp/peers containing the \fInoauth\fR option, the name of
-the serial port to use, and the \fIconnect\fR option (if required),
-plus any other appropriate options. In this way, pppd can be set up
-to allow non-privileged users to make unauthenticated connections only
-to trusted peers.
+The default behaviour of pppd is to allow an unauthenticated peer
+to use a given IP address if the system does not already have a
+route to that IP address already. For example, a system with a
+permanent connection to the wider internet will normally have a
+default route, and thus all peers will have to authenticate themselves
+in order to set up a connection. On such a system, the \fIauth\fR
+option should be used in /etc/ppp/options so that pppd will ask the
+peer to authenticate itself. On the other hand, a system where the
+PPP link is the only connection to the internet will not normally have
+a default route, so the peer will be able to use almost any IP address
+without authenticating itself.