How to setup PPP dial-in server

How to setup pppd dial-in access server?
kennycpuAsked:
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superschlonzCommented:
First edit /etc/ppp/options, I have the following lines in it:

-detach
lock
modem
crtscts
asyncmap 20A0000
escape FF
lcp-restart 11
lcp-max-terminate 12
<local IP>:<remote IP>
netmask 255.255.255.0
debug

All these options any many more can be found in the manual of pppd.
Perhaps you also want to use PAP or CHAP for authentication (then you should also set up /etc/ppp/pap-secrets
or /etc/ppp/chap-secrets).
Now you can test it:

/usr/sbin/pppd /dev/ttyS0 38400

If it works, then just add a line to /etc/inittab which looks like this, and it will run after next reboot:

mo:2345:respawn:/usr/sbin/pppd /dev/ttyS0 38400

The first field (mo) is just an identifier, the second (2345) are the runlevels in which pppd should run,
respawn means restart it if it stops, then the command follows: the absolute path to pppd, the device
and the baud rate.
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