From: James Yu <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: chat scritp for ppp dialup server
Date: Thu, 6 May 1999 11:01:34 -0700
Do you know how to set up the chat script to make my Linux box become
an PPP dialup server ? Any pointer will help. Thanks.
James
========================
Please check the following document. I have done with some success been able
to connect
http://www.pcquest.com/mar99/remote.asp
Configure your Linux server for access through a modem
You are on the move and need to access some files from your office
computer. Wouldn�t it
be nice to dial up your office server and download the files using
FTP? You can do just that
with a remote dial-in server running on your organization�s
network. In this article, we�ll
explain how to configure a remote dial-in server in Red Hat Linux
using the PPP protocol.
The first step is to install the modem. Plug in the modem�s serial cable
into a spare serial port on your
computer. A phone-line should also be connected to your modem. Start Linux
and log in as root. You
should remain logged in as root throughout the setup process. You should
also start the X Windowing
system.
Fire up glint, the X interface to the Red Hat Package Manager, and check
whether mgetty and PPP
packages are installed. mgetty can be found in the Networking/Utilities
folder and PPP in the
Networking/Daemons folder.
If these packages aren�t installed on your system, mount the PC Quest CD in
/mnt/cdrom. Once the CD
is mounted, switch over to glint and click on the Available button. Glint
should show you a list of
available packages arranged in a series of folders. Double click on the
Networking folder and then on the
Daemons folder. Search for the PPP package, select it and click on the
Install button. Glint should now
install the PPP package.
Similarly, move to the Networking/Utilities folder, search for the mgetty
package and install it.
Okay, now that both PPP and mgetty have been installed, the next step is to
configure the two
packages. Let�s start with mgetty first. Mgetty is a replacement for the
standard Unix getty, capable of
handling serial connections. The getty process is responsible for the login
prompt and getting the login
name from the user. Open up the /etc/inittab file in your favorite text
editor and add
V1:2345:respawn:/sbin/mgetty -s 115200 ttyS0
at the end. When Linux starts, the init process goes through this file,
looking for processes to execute.
The option 2345 tells init to run the mgetty process in the multi-user run
levels 2, 3, 4, and 5. The
respawn option allows mgetty to restart every time it terminates.
Let�s examine the parameters given to mgetty itself. The parameter "-s
115200" directs mgetty to use
the serial port at the highest possible speed, 11,5200 bps. Remember that
this is the speed at which the
computer communicates with the modem. The modem usually talks to other
modems at a lower speed.
The last parameter, ttyS0 should be used if your modem is connected to the
serial port, COM1. If your
modem is on COM2, type ttyS1 instead.
Remember that mgetty will lock the modem for its own use. If you wish to use
the server for dialing out,
you�ll have to terminate the mgetty process either manually or through some
shell scripts.
Since we plan to use Windows Dialup Networking to connect, it makes sense to
enable PAP
authentication, that way users don�t have to mess with stuff like dial-in
scripts.
Edit the file /etc/mgetty+sendfax/login.config, and make sure that the line
with "/AutoPPP/" is
uncommented, remove the # mark in front of it, and edit it so that it looks
like this:
/AutoPPP/ - - /etc/ppp/ppplogin
Save the file.
Notice that this points to a file called /etc/ppp/ppplogin, we need to
create this one. It�s a small file that
has the following contents:
#!/bin/sh
mesg n
tty -echo
/usr/sbin/pppd silent auth -chap +pap login
Save the file and make it executable:
chmod +x /etc/ppp/ppplogin
Now create or update the /etc/ppp/options file:
-detach
modem
lock
crtscts
asyncmap 0
netmask 255.255.255.0
proxyarp
ms-dns <dns address>
In the above replace <dns address> with the IP address of your LAN�s DNS
server. In our case, the
machine 192.168.1.15 acts as our DNS, so we used:
ms-dns 192.168.1.15
Create another file /etc/ppp/options.ttyS0 and add the following to it:
<your server�s hostname>:<The remote IP address>
For example, we used ws120.cmil.com:192.168.1.200
The hostname can be had by running the hostname command. You could also look
into the
/etc/HOSTNAME file. The second address is allocated to the remote system.
Any unused IP address on
your network should do.
Also remember to set PPPD as SUID root as it configures a network interface
and manipulates kernel
routing tables. All this requires special privileges. To do this, run the
command:
# chmod +s /usr/sbin/pppd
Finally, let�s update the PAP authentication database. This is simple, we
are going to validate users
against the standard /etc/passwd, so all you need to do is edit the file
/etc/ppp/pap-secrets, and add one
line for every IP address you are going to allocate to a dial-in connection.
In our setup,
/etc/ppp/pap-secrets looks like this:
# Secrets for authentication using PAP
# client server secret IP addresses
* * "" 192.168.1.200
You might add more lines that are identical to the last one shown above, one
for every IP address you�ll
be using.
That�s it. Now run the command "init q" which will re-read the file
/etc/inittab and start the required
processes. Now, dial-in PPP should be up and running, you can check this on
your modem, the DTR
light will have come on.
To connect via PPP, dial in from any other system using dial up networking.
To connect from a Win 9x system, go to Dialup Networking in My Computer,
select "Make a New
Connection", enter some name (such as "Linux dialup"), make sure the correct
modem is selected (and
optionally configure it), and press Next. Do not select "bring up terminal
after dialing" in the modem
configuration, it�s not required. Nor should you assign a dialup-script.
Enter the telephone number that is attached to your modem, press Next, and
then finish the setup. Now
right click the newly created connection, go to "Server Types" and disable
"Log on to Network", NetBEUI
and IPX/SPX Compatible, leaving only "TCP/IP" and "Enable Software
Compression" ticked. Click on
OK.
That�s it. Now to connect from the Win 9x machine, double click the new
connection, enter your user ID
and password (and optionally tell the system to remember your password),
click on connect, and your
Windows machine will dial into the Linux box, connect, establish PPP, and
voila! You are on! Check it
out by pointing your browser to your Linux box, you should see the Web pages
stored there. Tell your
mail client to send and receive mail via the Linux box, and that too works.
While reading this, you might feel that the setup is complex. Don�t let this
detailed article scare you
away. We thought the same but the whole process took us a little less than
five minutes, and was far
easier than configuring a Win NT RAS server
Mohammed Akram Ali Mehkri
System Administrator Saehan India
Webmaster www.prizeclub.com
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