Set the LCP restart interval (retransmission timeout) to \fIn\fR
seconds (default 3).
.TP
+.B lcp\-rtt\-file \fIfilename
+Sets the file where the round-trip time (RTT) of LCP echo-request frames
+will be logged.
+.TP
.B linkname \fIname\fR
Sets the logical name of the link to \fIname\fR. Pppd will create a
file named \fBppp\-\fIname\fB.pid\fR in /var/run (or /etc/ppp on some