ZyXEL Communications Prestige 941, Руководство пользователя, Страница: 49 / 99

Prestige 941 Cable Router
Internet Access 3-9
Figure 3-5 Single User Account Topology
The IP address for the SUA can be either fixed or dynamically assigned. 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, incoming inquiries will be filtered out by your Prestige and thereby, prevent 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) .
3.5.1 Advantages of SUA
In summary:
•
SUA is a cost-effective solution for small offices with less than 64 hosts to access the Internet.
•
SUA supports servers to be accessible to the outside world.
•
SUA can provide firewall protection if you do not specify a server. All incoming inquiries will be
filtered out by your Prestige.