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Configuring for Internet Access 45
defined, all incoming inquiries will be filtered out by the Prestige
even if you do have a server on your network. This can prevent
intruders from probing your system.
The Prestige accomplishes this address sharing by translating the
internal LAN IP addresses to a single address that is globally
unique on the Internet. For more information on IP address
translation, refer to RFC 1631,
The IP Network Address Translator
(NAT)
.
In summary:
1. SUA is an ideal, cost-effective solution for small offices with
less than 20 hosts using a LAN to concurrently access the
Internet or other remote TCP/IP network.
2. SUA can provide one server address to be accessed by Remote
Dial-in Users, thus controlling the incoming packets.
3. SUA can provide firewall protection if you do not configure a
server IP address. All incoming inquiries will be filtered out by
the Prestige. Therefore, servers on your network are protected.
4. UDP and TCP datagrams can be routed. In addition, ICMP
echo can also be routed.
The figure below shows an example of a small office connected to
the Internet via a Single User Account using the Prestige. Note that
if you enable the Single User Account feature, your local IP
address MUST be selected from the list of IP addresses for private
networks as defined by the IANA.