FreeBSD Handbook : PPP and SLIP : Setting up Kernel PPP : Working as a PPP server
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15.2.2. Working as a PPP server

/etc/ppp/options:

crtscts				# Hardware flow control
netmask 255.255.255.0		# netmask ( not required )
192.114.208.20:192.114.208.165  # ip's of local and remote hosts
				# local ip must be different from one
				# you assigned to the ethernet ( or other )
				# interface on your machine.
				# remote IP is ip address that will be 
				# assigned to the remote machine
domain ppp.foo.com		# your domain
passive				# wait for LCP
modem				# modem line

Following /etc/ppp/pppserv script will enable ppp server on your machine

#!/bin/sh 
ps ax |grep pppd |grep -v grep
pid=`ps ax |grep pppd |grep -v grep|awk '{print $1;}'`
if [ "X${pid}" != "X" ] ; then
        echo 'killing pppd, PID=' ${pid}
        kill ${pid}
fi
ps ax |grep kermit |grep -v grep
pid=`ps ax |grep kermit |grep -v grep|awk '{print $1;}'`
if [ "X${pid}" != "X" ] ; then
        echo 'killing kermit, PID=' ${pid}
        kill -9 ${pid}
fi

# reset ppp interface
ifconfig ppp0 down
ifconfig ppp0 delete

# enable autoanswer mode
kermit -y /etc/ppp/kermit.ans

# run ppp
pppd /dev/tty01 19200

Use this /etc/ppp/pppservdown script to stop ppp server:

#!/bin/sh 
ps ax |grep pppd |grep -v grep
pid=`ps ax |grep pppd |grep -v grep|awk '{print $1;}'`
if [ "X${pid}" != "X" ] ; then
        echo 'killing pppd, PID=' ${pid}
        kill ${pid}
fi
ps ax |grep kermit |grep -v grep
pid=`ps ax |grep kermit |grep -v grep|awk '{print $1;}'`
if [ "X${pid}" != "X" ] ; then
        echo 'killing kermit, PID=' ${pid}
        kill -9 ${pid}
fi
ifconfig ppp0 down
ifconfig ppp0 delete

kermit -y /etc/ppp/kermit.noans

Following kermit script will enable/disable autoanswer mode on your modem (/etc/ppp/kermit.ans):

set line /dev/tty01
set speed 19200
set file type binary
set file names literal
set win 8
set rec pack 1024
set send pack 1024
set block 3
set term bytesize 8
set command bytesize 8
set flow none

pau 1
out +++
inp 5 OK
out ATH0\13
inp 5 OK
echo \13
out ATS0=1\13	; change this to out ATS0=0\13 if you want to disable
		; autoanswer mod
inp 5 OK
echo \13
exit

This /etc/ppp/kermit.dial script is used for dialing and authorizing on remote host. You will need to customize it for your needs. Put your login and password in this script , also you will need to change input statement depending on responses from your modem and remote host.

;
; put the com line attached to the modem here:
;
set line /dev/tty01
;
; put the modem speed here:
;
set speed 19200
set file type binary		; full 8 bit file xfer
set file names literal
set win 8
set rec pack 1024
set send pack 1024
set block 3
set term bytesize 8
set command bytesize 8
set flow none
set modem hayes
set dial hangup off
set carrier auto		; Then SET CARRIER if necessary,
set dial display on		; Then SET DIAL if necessary,
set input echo on
set input timeout proceed
set input case ignore
def \%x 0			; login prompt counter
goto slhup

:slcmd				; put the modem in command mode
echo Put the modem in command mode.
clear				; Clear unread characters from input buffer
pause 1
output +++			; hayes escape sequence
input 1 OK\13\10		; wait for OK
if success goto slhup
output \13
pause 1
output at\13
input 1 OK\13\10
if fail goto slcmd		; if modem doesn't answer OK, try again

:slhup				; hang up the phone
clear				; Clear unread characters from input buffer
pause 1
echo Hanging up the phone.
output ath0\13			; hayes command for on hook
input 2 OK\13\10
if fail goto slcmd		; if no OK answer, put modem in command mode

:sldial				; dial the number
pause 1
echo Dialing.
output atdt9,550311\13\10		; put phone number here
assign \%x 0			; zero the time counter

:look
clear				; Clear unread characters from input buffer
increment \%x			; Count the seconds
input 1 {CONNECT }
if success goto sllogin
reinput 1 {NO CARRIER\13\10}
if success goto sldial
reinput 1 {NO DIALTONE\13\10}
if success goto slnodial
reinput 1 {\255}
if success goto slhup
reinput 1 {\127}
if success goto slhup
if < \%x 60 goto look
else goto slhup

:sllogin			; login
assign \%x 0			; zero the time counter
pause 1
echo Looking for login prompt.

:slloop
increment \%x			; Count the seconds
clear				; Clear unread characters from input buffer
output \13
;
; put your expected login prompt here:
;
input 1 {Username: }
if success goto sluid
reinput 1 {\255}
if success goto slhup
reinput 1 {\127}
if success goto slhup
if < \%x 10 goto slloop		; try 10 times to get a login prompt
else goto slhup			; hang up and start again if 10 failures

:sluid
;
; put your userid here:
;
output ppp-login\13
input 1 {Password: }
;
; put your password here:
;
output ppp-password\13
input 1 {Entering SLIP mode.}
echo
quit

:slnodial
echo \7No dialtone.  Check the telephone line!\7
exit 1

; local variables:
; mode: csh
; comment-start: "; "
; comment-start-skip: "; "
; end:


FreeBSD Handbook : PPP and SLIP : Setting up Kernel PPP : Working as a PPP server
Previous: Working as a PPP client
Next: Setting up a SLIP Client