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Windows Dial-Up Connection with SLiRP

Originally by Jose' Torres and Chris Pelton

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Table of Contents

• Introduction
• Requirements
• Installing the Components
• Configuring the Connection
• Making the Connection

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Introduction

• We will configure a computer that is running the Windows 2000 operating system to use dial-up (TCP/IP) networking services. We will install a connection script on the Windows computer that will be executed by the (Windows) dial-up networking services to establish an Internet connection via a local (University) Unix/Linux account. When this connection is operational, you will be able to run Netscape and other Internet software from a remote (home) Windows system.
  
• We assume the existence of a working Windows 2000 system with (working/configured) modem.

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Requirements

• The following system components must be installed/configured on your home Windows system to get the Internet connection on-line.
  • 
    
  • TCP/IP    (drivers for the basic Internet network communication protocols)
  • 
    
  • Dial-Up Adapter    (drivers for running TCP/IP via serial port and modem hardware on a Windows system)
  • 
    
  • Dial-Up Networking    (more drivers for running connection scripts to access Internet)
  • 
    
  • Dial-Up Script    (commands to connect to University modem bank, logon to University computer, and initiate TCP/IP communication)

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Installing the Components

NOTE: If necessary system components are not pre-installed on your computer's hard disk, you may be prompted for Windows (and possibly other) installation CDs.

TCP/IP and DIAL-UP ADAPTER in WINDOWS 2000

• The Windows 2000 installation automatically installs TCP/IP and Dial-Up Adapter software. The Windows 2000 Plug&Play configurator (runs during system installation) will usually detect your modem, install the correct modem drivers.
  
  • Select Start->Settings-> Network and Dial-up Connections.
    
  • You should see Make New Connection and Local Area Connection.
    

DIAL-UP SCRIPT

• Enter the following text into a file. (We will refer to the file as "UA-SLiRP.scp".) Note the file must have a ".scp" extension. Use Note Pad, click on "Save as...", change "Save as type: " to "All files", type in filename.scp. Place the file wherever you wish. You will need to browse/find this file during the configuration process.
  

  ;

  ;

  ; script to login to hedgehog machine and run slirp

  ;

  ;

  proc main

  waitfor "00:"

  transmit "telnet hedgehog.math.arizona.edu^M"

  waitfor "ogin"

  transmit $USERID

  transmit "^M"

  waitfor "assword"

  transmit $PASSWORD

  transmit "^M"

  waitfor "$ "

  transmit "exec /usr/local/bin/slirplogin -P -b 115200^M"

  endproc

  
  
• This sample dial-up script (a send/expect series of text exchanges) probably will require modification to access your local University account and run SLiRP (which must be installed on the host University system). It is IMPORTANT to note (in the script) that case is important, the control-M characters are essential, and (on purpose) we perform a minimal match on "the end" of expected prompt strings.
  

  To assist modification efforts:
  

  • The script first waits for the end of The University's modem-bank login message ... a prompt string ending in UAcats-96"00:". Change this waitfor setting if The University alters its modem-bank prompt. How would you know this?? ... call 618-3190 (using HyperTerminal) and read the message.
    
  • The script then executes a telnet connection to a local campus machine ... "hedgehog.math.arizona.edu". Change this hostname to an appropriate University computer (if you don't use hedgehog.math.arizona.edu). Keep the newline character (control-M) within the quoted string.
    
  • The script then waits for the hedgehog login prompt. Change this waitfor setting to match the end of your computer's login prompt. How would you know this?? ... call 618-3190 (using HyperTermnial), telnet to your computer, and read the login prompt.
    
  • The script then sends your username ... which you enter at run-time in a pop-up panel that is supplied by the Windows dial-up service. The script also sends a newline ... the (essential) control-M.
    
  • The script then waits for hedgehog's password prompt. Change this waitfor setting to match the end of your computer's password prompt. How would you ...??   yup!
    
  • The script then sends your password ... which you also enter into the pop-up panel (at run-time). The script also sends the control-M (essential).
    
  • The script then waits for the end of the hedgehog shell prompt ... a dollar sign followed by a space. Change this waitfor setting to match your account's shell prompt.
    
  • The script then sends the command to start up SLiRP on the hedgehog system ... setting options for PPP mode and maximum speed. This command string is also newline terminated (essential). Change this command string to that required by your SLiRP-host system. How would you know this?? ... ask around.

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Configuring the Connection

DIAL-UP CONNECTION in WINDOWS 2000

• We need to tell the Windows dial-up networking software about the connection that we wish to establish. We assign a "name" and phone number to this entity. For this example, we choose "Arizona" to be the named connection.
  
  • Select Start->Settings->Network and Dial-up Connections-> Make New Connection, click Next.
    
  • In the panel that appears, choose Dial-up to private network
    
  • In the panel that appears, enter the phone number, "618-3190".
    
  • In the panel that appears, choose For all users or Only for myself.
    
  • In the panel that appears, enter a name for the connection. ... we choose "Arizona".
    
  • Choose Finish, click Cancel.
  
  
• Windows has now created an (almost fully) configured dial-up networking configuration and placed it in the "Network and Dial-Up Connections" folder, Start->Settings->Network and Dial-up Connections. We need to set one more configuration detail, the name of our connection script.
  
  • Select and double Click Start->Settings->Network and Dial-Up Connections
    
  • RIGHT click on (whatever name you gave to) the new connection, Arizona (in our example).
    
  • Click on Properties.
    
  • Select the Networking menu.
    1. Select "PPP", click on "Settings"
    2. Check ON "Enable LCP extensions".
    3. Check ON "Enable software compression".
    4. Click ON "Negotiate multi-link for singlelink connections", OK
    5. Select "Internet Protocol(TCP/IP)", click on "Properties"
       1. Select "Obtain an IP address automatically".
       2. Select "Use the following DNS Server address".
       3. Select "Preferred DNS Server" and enter "10.0.2.3".
       4. Click on OK.
       5. Click on "Advanced..."
       6. Check ON "Use default gateway on remote network"
       7. Check ON "Use IP header compression"
    
    
  • Select the Security menu.
    1. Check ON "Typical(recommended settings)"
    2. Check ON "Run script: "
    3. Use the Browse button to locate the dial-up script file, UA-SLiRP.scp (in our example), click "Open"
    4. Check ON "Show terminal window"   (Note: must be checked or dial-up will not work)

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Making the Connection

• It's now time to try out the setup. Make sure the modem is connected via phone line to a live telephone circuit. Make sure the modem is connected via phone line to a live telephone circuit! ...
  
  • Double-click the connection icon, "Arizona" in our example.
    
  • Enter the Username and Password for the University account that you are using (in the "telnet" line of the dial-up script) to establish the SLiRP connection. You can check ON the Save password box ... so that you don't have to enter this information every time you make a connection (but realize that anyone can now use your Windows system to access the Internet).
    
  • Click on the Dial tab.
  
  
• A panel will pop-up that displays a series of messages confirming the connection process. If all goes well, a final message box will appear saying 'Arizona' is now connected. (Substitute the name you gave to your connection for Arizona.) You also will see information about how to disconnect.
  • 
    
  • Click on OK.
    
  • You can now proceed to use Netscape/Microsoft Internet Explorer, etc..
    
  • In the lower right corner of your screen, note the modem status indicator (two blinking cpmputers). To get an indication of bytes being sent and received, slide/position the mouse over the modem indicator.
    
  • To disconnect, double-click on the modem status indicator. A pop-up panel appears .. double-click on the "Dicsonnect" tab.