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routers use network address conversion (NAT) to provide a single IP address
from the Internet service between various home computers. When traffic from the
Internet reaches your router, your router doesn't know which computer to send
it to, so it throws the truck away. In effect, NAT acts as a firewall that
prevents incoming requests from reaching your computer. Depending on your
router, you may be able to block certain types of outgoing traffic by changing
your router settings.
It
is possible to forward some traffic to the router by setting up port forwarding
or placing a computer in DMZ (demilitarized zone), where all incoming traffic
is sent and activated. DMZ, of course, forwards all traffic to a particular
computer: the computer will no longer benefit from the router which acts as a
firewall.
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