Connecting To The Internet; Physically Connect Modem Device - SnapGear VPN appliance Family 1.7.8 User Manual

3. Connecting to the Internet

This chapter provides step-by-step instructions for connecting your SnapGear appliance
to your Internet Service Provider (ISP).
The SnapGear appliance provides secure Internet access using its robust embedded
firewall. The SnapGear appliance has an IP masquerading feature, which means that
users on your local network can see the outside world; however the outside world cannot
see inside your local network. This shields your network from intruders and also allows
you to filter packets (see Chapter 6, Firewall) to prevent unwanted traffic to/from your
network.
The SnapGear appliance can connect to the Internet using an external dialup analog
modem, an ISDN modem, a permanent analog modem, a cable modem or DSL link as
shown in the following figure:
Figure 3.1 Internet connection

Physically connect modem device

The first step in connecting your office network to the Internet is to physically attach your
SnapGear appliance to the modem device. For analog modems, attach the modem serial
cable to one of the SnapGear appliance's serial ports (i.e. COM1, COM2). For digital
connections (e.g. cable, DSL), plug the cable into the Internet port.
Warning
To connect to an ISDN line, the SnapGear appliance requires an intermediate device
called a Terminal Adapter (TA). A TA connects into your ISDN line and has either a serial
or Ethernet interface that is connected to your SnapGear appliance. Do NOT plug an
ISDN connection directly in to your SnapGear appliance.
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Connecting to the Internet