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Getting on the Internet 5
FIGURE 5-2
Connect an Ethernet card to broadband and start surfing.
Connecting Multiple Computers to Broadband
Instead of connecting your Linux computer directly to the cable modem or DSL equipment, you
can join your machines together on a LAN, and then connect the LAN to your ISP equipment so
that everyone in the house or office can share the broadband connection. It??™s fairly simple; you just
connect your cable/DSL modem to your LAN instead of directly to your Linux box. In this configuration,
however, you should consider adding a firewall/router as a buffer between your LAN and
the outside world. That machine would perform such duties as:
Blocking access??”A well-configured firewall blocks access to all ports except those that
you need to access the Internet the way you want, thereby minimizing the risks of intruders
getting into your LAN.
NAT or IP Masquerading??”For the most part, you want the computers behind your
firewall that are simply desktop systems to not be accessible to others from the Internet.
By configuring your firewall to do NAT or IP Masquerading, your computers can be
assigned private IP addresses. Your firewall then handles forwarding of messages between
your LAN and the Internet.
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