Where to Go From Here
Task | For Instructions |
|---|---|
Set up more users of the dial-in server | |
Configure communications over the dial-in server | "How to Define Communications Over the Serial Line (Dial-in Server)" |
Configuring Communications Over the Dial-in Server
The next task shows how to enable the dial-in server to open communications with any dial-out machine, based on options that are defined in the following PPP configuration files:
/etc/ppp/options
/etc/ppp/options.ttyname
Before you proceed, you should have done the following:
Configured the serial port and modem on the dial-in server, as described in "How to Configure the Modem and Serial Port (Dial-in Server)".
Configured information about the prospective users of the dial-in server, as described in "How to Configure Users of the Dial-in Server".
How to Define Communications Over the Serial Line (Dial-in Server)
Become superuser on the dial-in server.
Create the /etc/ppp/options file with the following entry.
nodefaultroute
nodefaultroute indicates that no route is defined for the server.
Note - If the dial-in server does not have an /etc/ppp/options file, only the superuser can run the pppd command. However, the /etc/ppp/options file can be empty.
Create the file /etc/options.ttyname to define how calls that are received over serial port ttyname should be handled.
The following /etc/options.ttya file defines how the dial-in server's serial port /dev/ttya should handle incoming calls.
:10.0.0.80 xonxoff
:10.0.0.80
Assigns the IP address 10.0.0.80 to all peers that are calling in over serial port ttya
xonxoff
Allows the serial line to handle communications from modems with software flow control enabled
Where to Go From Here
If you have followed all the procedures in this chapter, you have completed the configuration of the dial-up link.
Task | For Instructions |
|---|---|
Test modem connectivity by dialing out to another computer | cu(1C) andtip(1) man pages. These utilities can help you test if your modem is properly configured and can establish a connection with another machine. |
Configure more options for the dial-in server | |
Configure more dial-out machines | |
Have the remote machine call the dial-in server |
Calling the Dial-in Server
You establish a dial-up PPP link by having the dial-out machine call the dial-in server. You can instruct the dial-out machine to call the server by specifying the demand option in the PPP configuration files on the dial-out machine. But the most common method for establishing the link is for the user to run the pppd command on the dial-out machine.
Before you proceed to the next task, you should have done either or both of the following:
Set up the dial-out machine, as described in "Configuring the Dial-out Machine"
Set up the dial-in server, as described in "Configuring the Dial-in Server"
How to Call the Dial-in Server
Log in to the dial-out machine by using your regular user account, not root.
Call the dial-in server by running the pppd command.
For example, the following command initiates a link between the dial-out machine and dial-in server myserver:
% pppd 57600 call myserver
pppd
Starts the call by invoking the pppd daemon
57600
Sets the speed of the line between host and modem
call myserver
Invokes the call option of pppd. pppd then reads options in the file /etc/ppp/peers/myserver, which was created in "How to Define the Connection With an Individual Peer"
Contact a host on the server's network, for example, the host lindyhop that is shown in Figure 30-1:
ping lindyhop
If the link is working correctly, the standard Telnet login sequence should be displayed in the terminal window. If the link is not working correctly, refer to Chapter 35, Fixing Common Problems (Tasks).
Terminate the PPP session:
% pkill -TERM -x pppd
Where to Go From Here
If you have followed all the procedures in this chapter, you have completed the configuration of the dial-up link.
Task | For Instructions |
|---|---|
Have users start working on their dial-out machines | |
Fix problems on the link | |
Learn more about the files and options that are used in this chapter |