ZyXEL Communications 100WH user manual Advantages of SUA, 10Chapter 3 Internet Access Application

Prestige 100WH Internet Access Router

The Single User Account feature may also be used to connect to remote networks other than the Internet. For example, this feature can be used to simplify the allocation of IP addresses when connecting branch offices to the corporate network.

The IP address for the SUA can be either fixed or dynamically assigned by the ISP (or another remote node). In addition, you can also configure a server (for example, a Web server) on your local network and make it accessible to outside users.

If you do not set a server IP address, SUA offers the additional benefit of firewall protection. With SUA, all incoming inquiries will be filtered out by your Prestige if no server is defined. This can 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).

3.5.1Advantages of SUA

The advantages of SUA include

•SUA is an ideal cost-effective solution for small offices with a few tens of hosts to concurrently access the Internet or another remote TCP/IP network.

•SUA can provide one server to be accessible to the outside world.

•SUA can provide firewall protection if you do not configure a server. All incoming inquiries will be filtered out by your Prestige, protecting your network.

•UDP and TCP datagrams can be routed. In addition, partial ICMP is supported.

Figure 3-5 above shows an example of a small office connecting to the Internet via SUA.

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