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This chapter will walk you through connecting the SnapGear VPN Router to your Internet Service
Provider (ISP).
The SnapGear VPN Router provides secure Internet access through its robust embedded firewall. Its
IP masquerading feature means that although users of your local network can see the outside world,
the outside world can't see them, shielding your network from intruders. This simple, flexible
solution also allows you to set packet filters (see Chapter 6, Firewall) to disallow any unwanted
traffic into or out of your network.
The SnapGear VPN Router can connect to the Internet via an external dialup analog modem, ISDN
modem, permanent analog modem, cable modem or DSL link (see Figure 6).
Physically connect modem device
To connect your office network to the Internet you must first physically attach your SnapGear VPN
Router to a modem device (cable, ISDN, DSL or analog). For analog modems, attach the modem
serial cable to one of the SnapGear VPN Router's serial ports (COM1, COM2). For digital
connections (cable, ISDN, DSL), plug the cable into the Internet port.
Warning: ISDN connections – To connect to an ISDN line, the SnapGear VPN Router requires
an intermediary device called a Terminal Adapter (TA). A Terminal Adapter will connect
into your ISDN line and either have a serial or Ethernet interface that you can then connect
to your SnapGear VPN Router.
Connect to the Internet
3. Connect to the Internet
Figure 3.1 Internet connection
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