+.B modem
+Use the modem control lines. This option is the default. With this
+option,
+.B pppd
+will wait for the CD (Carrier Detect) signal from the modem to be asserted
+when opening the serial device
+(unless a connect script is specified), and it will drop the DTR (Data
+Terminal Ready) signal briefly when the connection is terminated and before
+executing the connect script.
+On Ultrix, this option implies hardware
+flow control, as for the \fBcrtscts\fR option.
+.TP
+.B -mn
+Disable magic number negotiation. With this option,
+.I pppd
+cannot detect a looped-back line.
+.TP
+.B -mru
+Disable MRU [Maximum Receive Unit] negotiation. With this option,
+\fIpppd\fR will use the default MRU value of 1500 bytes.
+.TP
+.B name \fI<n>
+Set the name of the local system for authentication purposes to <n>.
+.TP
+.B noipdefault
+Disables the default behaviour when no local IP address is specified,
+which is to determine (if possible) the local IP address from the
+hostname. With this option, the peer will have to supply the local IP
+address during IPCP negotiation (unless it specified explicitly on the
+command line or in an options file).
+.TP
+.B -p
+Same as the
+.B passive
+option.
+.TP
+.B +pap
+Require the peer to authenticate itself using PAP.
+.TP
+.B -pap
+Don't agree to authenticate using PAP.
+.TP
+.B papcrypt
+Indicates that all secrets in the /etc/ppp/pap-secrets file which
+are used for checking the identity of the peer are encrypted, and thus
+pppd should not accept a password which (before encryption) is
+identical to the secret from the /etc/ppp/pap-secrets file.