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31.  Setting Up a Dial-up PPP Link (Tasks) Configuring the Dial-out Machine Configuring Communications on the Dial-out Machine  Previous   Contents   Next 
   
 

How to Define Communications Over the Serial Line

  1. Become superuser on the dial-out machine.

  2. Create a file that is called /etc/ppp/options with the following entry:

    lock

    The /etc/ppp/options file is used for defining global parameters that apply to all communications by the local machine. The lock option enables UUCP-style locking of the form /var/spool/locks/LK.xxx.yyy.zzz.

    Note - If the dial-out machine does not have an /etc/ppp/options file, only the superuser can run the pppd command. However, the /etc/ppp/options can be empty.

    For a complete description of /etc/ppp/options, refer to "/etc/ppp/options Configuration File".

  3. (Optional)

    Create a file that is called /etc/ppp/options.ttyname for defining how communications should be initiated from a specific serial port.

    The next example shows an /etc/ppp/options.ttyname file for the port with the device name /dev/cua/a.

    # vi /etc/ppp/options.cua.a
crtscts

    The PPP option crtscts tells the pppd daemon to turn on hardware flow control for serial port a.

    For more information about the /etc/ppp/options.ttyname file, go to "/etc/ppp/options.ttynameConfiguration File".

  4. Set the modem speed, as described in "How to Set the Modem Speed".

How to Create the Instructions for Calling a Peer

Before the dial-out machine can initiate a PPP link, you must collect information about the dial-in server to become the peer. Then you use this information to create the chat script, which describes the actual conversation between the dial-out machine and the peer.

  1. Determine the speed at which the dial-out machine's modem needs to run.

    For more information, see "Configuring the Modem Speed".

  2. Obtain the following information from the dial-in server's site:

    • Server's telephone number

    • Authentication protocol that is used, if appropriate

    • Login sequence that is required by the peer for the chat script

  3. Obtain the names and IP addresses of name servers at the dial-in server's site.

  4. Put instructions for initiating calls to the particular peer in a chat script.

    For example, you might create the following chat script, /etc/ppp/mychat, to call the dial-in server myserver. 
    SAY "Calling the peer\n"
        TIMEOUT 10
        ABORT BUSY
        ABORT 'NO CARRIER'
        ABORT ERROR
        REPORT CONNECT
        "" AT&F1&M5S2=255
        TIMEOUT 60
        OK ATDT1-123-555-1234 
        CONNECT \c
        SAY "Connected; logging in.\n"
        TIMEOUT 5
        ogin:--ogin: pppuser
        TIMEOUT 20
        ABORT 'ogin incorrect'
        ssword: \qmypassword
        "% " \c
        SAY "Logged in.  Starting PPP on peer system.\n" 
        ABORT 'not found'
        "" "exec pppd"
        ~ \c
    The script contains instructions for calling a Solaris dial-in server that requires a login sequence. For a description of each instruction, refer to "Basic Chat Script Enhanced for a UNIX-Style Login". For complete details on creating a chat script, read the section "Defining the Conversation on the Dial-up Link".

    Note - You do not invoke the chat script directly. Rather, you use the file name of the chat script as an argument to the connect option, which invokes the script.

If a peer runs Solaris or a similar UNIX-based operating system, consider using the previous chat script as a template for your dial-out machines.

How to Define the Connection With an Individual Peer

  1. Become superuser on the dial-out machine.

  2. Update DNS databases by creating the following /etc/resolv.conf file:
    domain bigcompany.com
nameserver 10.10.111.15
nameserver 10.10.130.8

    domain bigcompany.com

    Specifies that the peer's DNS domain is bigcompany.com.

    nameserver 10.10.111.15

    nameserver 10.10.130.8

    Lists the IP addresses of name servers at bigcompany.com.

    For complete details on DNS implementation, refer to "DNS Administrtaion (Reference)" in System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP).

  3. Edit the /etc/nsswitch.conf file to have the DNS database searched first for host information.

    hosts:      dns [NOTFOUND=return] files

  4. Create the /etc/ppp/peers directory, and then add a file for the peer.

    For example, you would create the following file to define the dial-in server myserver:
    # cd /etc/ppp
# mkdir peers
# cd peers
# vi myserver
/dev/cua/a
57600
noipdefault
defaultroute
idle 120
noauth
connect "chat -U 'mypassword' -T 1-123-555-1213 -f /etc/ppp/mychat"

    /dev/cua/a

    Specifies that the device /dev/cua/a should be used as the serial interface for calls to myserver.

    57600

    Defines the speed of the link.

    noipdefault

    Specifies that for transactions with peer myserver, the dial-out machine initially has an IP address of 0.0.0.0. myserver assigns an IP address to the dial-out machine for every dial-up session.

    idle 120

    Indicates that the link is to time out after it is idle for 120 seconds.

    noauth

    Specifies that the peer myserver does not need to provide authentication credentials when negotiating the connection with the dial-out machine.

    connect "chat -U 'mypassword' -T 1-123-555-1213 -f /etc/ppp/mychat"

    Specifies the connect option and its arguments, including the phone number of the peer, and the chat script /etc/ppp/mychat with calling instructions.

Where to Go From Here

Task

For Instructions

Configure another dial-out machine

"How to Configure the Modem and Serial Port (Dial-out Machine)".

Test modem connectivity by dialing out to a another computer

cu(1C) and tip(1) man pages. These utilities can help you test if your modem is properly configured and can establish a connection with another machine.

Get detailed information about the PPP configuration files

"Using PPP Options in Files and on the Command Line".

Begin configuring the dial-in server

"Configuring Devices on the Dial-in Server".

 		 
 
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