+
+
+------------------------------------------------------------------------
+
+Q: Since I installed ppp-2.3.6, dialin users to my server have been
+getting this message when they run pppd:
+
+peer authentication required but no suitable secret(s) found for
+authenticating any peer to us (ispserver)
+
+A: In 2.3.6, the default is to let an unauthenticated peer only use IP
+addresses to which the machine doesn't already have a route. So on a
+machine with a default route, everyone has to authenticate. If you
+really don't want that, you can put `noauth' in the /etc/ppp/options
+file. Note that there is then no check on who is using which IP
+address. IMHO, this is undesirably insecure, but I guess it may be
+tolerable as long as you don't use any .rhosts files or anything like
+that. I recommend that you require dialin users to authenticate, even
+if just with PAP using their login password (using the `login' option
+to pppd). If you do use `noauth', you should at least have a pppusers
+group and set the permissions on pppd to allow only user and group to
+execute it.
+
+------------------------------------------------------------------------
+
+Q: When running pppd as a dial-in server, I often get the message
+"LCP: timeout sending Config-Requests" from pppd. It seems to be
+random, but dial-out always works fine. What is wrong?
+
+A: Most modern modems auto-detects the speed of the serial line
+between the modem and the computer. This auto-detection occurs when
+the computer sends characters to the modem, when the modem is in
+command mode. It does not occur when the modem is in data mode.
+Thus, if you send commands to the modem at 2400 bps, and then change
+the serial port speed to 115200 bps, the modem will not detect this
+change until something is transmitted from the computer to the modem.
+When running pppd in dial-in mode (i.e. without a connect script),
+pppd sets the speed of the serial port, but does not transmit
+anything. If the modem was already running at the specified speed,
+everything is fine, but if not, you will just receive garbage from the
+modem. To cure this, use an init script such as the following:
+
+ pppd ttyS0 115200 modem crtscts init "chat '' AT OK"
+
+To reset the modem and enable auto-answer, use:
+
+ pppd ttyS0 115200 modem crtscts init "chat '' ATZ OK ATS0=1 OK"