Before you start setting up PPP on your machine, make sure
that pppd
is located in
/usr/sbin
and the directory
/etc/ppp
exists.
pppd
can work in two modes:
In both cases you will need to set up an options file
(/etc/ppp/options
or
~/.ppprc
if you have more than one user on
your machine that uses PPP).
You will also need some modem/serial software (preferably comms/kermit), so you can dial and establish a connection with the remote host.
The following /etc/ppp/options
might be
used to connect to a Cisco terminal server PPP line.
crtscts # enable hardware flow control modem # modem control line noipdefault # remote PPP server must supply your IP address # if the remote host does not send your IP during IPCP # negotiation, remove this option passive # wait for LCP packets domain ppp.foo.com # put your domain name here :<remote_ip> # put the IP of remote PPP host here # it will be used to route packets via PPP link # if you didn't specified the noipdefault option # change this line to <local_ip>:<remote_ip> defaultroute # put this if you want that PPP server will be your # default router
To connect:
Dial to the remote host using Kermit (or some other modem program), and enter your user name and password (or whatever is needed to enable PPP on the remote host).
Exit Kermit (without hanging up the line).
Enter the following:
#
/usr/src/usr.sbin/pppd.new/pppd /dev/tty01 19200
Be sure to use the appropriate speed and device name.
Now your computer is connected with PPP. If the connection
fails, you can add the debug
option to the
/etc/ppp/options
file, and check console messages
to track the problem.
Following /etc/ppp/pppup
script will make
all 3 stages automatic:
#!/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.dial pppd /dev/tty01 19200
/etc/ppp/kermit.dial
is a Kermit
script that dials and makes all necessary authorization on the
remote host (an example of such a script is attached to the end
of this document).
Use the following /etc/ppp/pppdown
script
to disconnect the PPP line:
#!/bin/sh pid=`ps ax |grep pppd |grep -v grep|awk '{print $1;}'` if [ X${pid} != "X" ] ; then echo 'killing pppd, PID=' ${pid} kill -TERM ${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 /sbin/ifconfig ppp0 down /sbin/ifconfig ppp0 delete kermit -y /etc/ppp/kermit.hup /etc/ppp/ppptest
Check to see if pppd
is still running by executing
/usr/etc/ppp/ppptest
, which should look like
this:
#!/bin/sh pid=`ps ax| grep pppd |grep -v grep|awk '{print $1;}'` if [ X${pid} != "X" ] ; then echo 'pppd running: PID=' ${pid-NONE} else echo 'No pppd running.' fi set -x netstat -n -I ppp0 ifconfig ppp0
To hang up the modem, execute
/etc/ppp/kermit.hup
, which should
contain:
set line /dev/tty01 ; put your modem device here 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 echo \13 exit
Here is an alternate method using chat
instead of kermit
:
The following two files are sufficient to accomplish a
pppd
connection.
/etc/ppp/options
:
/dev/cuaa1 115200 crtscts # enable hardware flow control modem # modem control line connect "/usr/bin/chat -f /etc/ppp/login.chat.script" noipdefault # remote PPP serve must supply your IP address # if the remote host doesn't send your IP during # IPCP negotiation, remove this option passive # wait for LCP packets domain <your.domain> # put your domain name here : # put the IP of remote PPP host here # it will be used to route packets via PPP link # if you didn't specified the noipdefault option # change this line to <local_ip>:<remote_ip> defaultroute # put this if you want that PPP server will be # your default router
/etc/ppp/login.chat.script
:
The following should go on a single line.
ABORT BUSY ABORT 'NO CARRIER' "" AT OK ATDT<phone.number> CONNECT "" TIMEOUT 10 ogin:-\\r-ogin: <login-id> TIMEOUT 5 sword: <password>
Once these are installed and modified correctly, all you need
to do is run pppd
, like so:
#
pppd
/etc/ppp/options
should contain something
similar to the following:
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
The following /etc/ppp/pppserv
script
will tell pppd to behave as a
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 # 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 the 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
The following Kermit script
(/etc/ppp/kermit.ans
) will enable/disable
autoanswer mode on your modem. It should look like this:
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 mode inp 5 OK echo \13 exit
A script named /etc/ppp/kermit.dial
is
used for dialing and authenticating on the remote host. You will
need to customize it for your needs. Put your login and password
in this script; you will also need to change the 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:
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