Prestige 641 ADSL Internet Access Router
Internet Access
3-11
Figure 3-5 Single User Account Topology
The IP address for the SUA can be either fixed or dynamically assigned by the ISP. In addition, you can
designate servers, e.g., a web server and a telnet server, on your local network and make them accessible to
the outside world. If you do not define any server, SUA offers the additional benefit of firewall protection.
If no server is defined, all incoming inquiries will be filtered out by your Prestige, thus preventing intruders
from probing your network. Your 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).
3.10.1 Advantages of SUA
In summary:
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SUA is a cost-effective solution for small offices to access the Internet or other remote TCP/IP
networks.
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SUA supports servers to be accessible to the outside world.
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SUA can provide firewall protection if you do not specify a server. All incoming inquiries will be
filtered out by your Prestige.
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UDP and TCP packets can be routed. In addition, partial ICMP, including echo and trace route, is
supported.
192.168.1.33
192.168.1.34
192.168.1.35
192.168.1.36
192.168.1.1
The SUA network appears as a
single host to the Internet.
Same Network
Number
Prestige
INTERNET