How to Define Communications Over the Serial Line (Dial-in Server)

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Become an administrator on the dial-in server.
For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.3.

Create the /etc/ppp/options file with the following entry.
```
nodefaultroute
```
nodefaultroute indicates that no pppd session on the local system can establish a default route without root privileges.
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.
```
:198.51.100.80
xonxoff
```
:198.51.100.80
Assigns the IP address 198.51.100.80 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

See Also

If you have followed all the procedures in this chapter, you have completed the configuration of the dial-up link. The following list provides references to related information.

To test modem connectivity by dialing out to another computer, see cu(1C) and tip(1) man pages. These utilities can help you test if your modem is properly configured. Also, use these utilities to test if you can establish a connection with another machine.
To configure more options for the dial-in server, see Configuring the Dial-in Server.
To configure more dial-out machines, see Configuring the Dial-out Machine.
To have the remote machine call the dial-in server, see Calling the Dial-in Server.