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Chapter 12 - Configuring PPP and Cellular Modem
Chapter 12 - Configuring PPP and Cellular
Modem
Introduction
This chapter familiarizes the user with:
• Configuring Cellular modem
• Configuring PPP Client
• Viewing status
PPP and Cellular Modem Fundamentals
The RuggedRouter may be equipped with a internal cellular modem instead of the
land-line modem or the serial card described in the preceding chapter. The cellular
modem allows connections to be made over cellular radio telephone link. PPP (the
Point-to-Point Protocol) is used to establish a network connection over a modem link.
PPP Interface
When a PPP connection is established, a network interface is created in the system.
The interface name for both internal and external modem connections is ppp10. Refer
to this interface name when configuring firewall rules.
Authentication, Addresses and DNS Servers
In contrast to the configuration for land-line modems described in the preceding
chapter, username and password might not be required for some cellular data service
providers. If username and password is not required, you can enter none in the
username and password fields of the GUI, or leave them blank. If authentication is
required by the cellular data service provider, again PPP authentication will
automatically use PAP or CHAP. Your service provider will provide you with a
username and password along with an Access Provider Name (APN), which must be
entered in the GUI.
The authentication process will provide a local IP address for use on the PPP interface
and optionally the addresses of the DNS servers and a default gateway address to use.
You should generally use these addresses unless you need to provide your own.
The PPP interface's IP address, obtained from the PPP server, can be either a dynamic
or a static IP address. Firewall configuration should be performed as is appropriate.
When the Modem Connects
A PPP Client Connection for the cellular modem may be configured to connect at
boot time.
LED Designations
The RuggedRouter dedicates two LEDs to indicate cellular modem status:
The leftmost LED of the bottom row (LED #29) is the “Line” LED.
• Solid Green indicates that a PPP link has been established.
• Flashing green indicates that PPP link negotiation is in progress.
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