ZyXEL Communications 153X user manual Advantages of SUA

Prestige 153/153X WAN Bridge/Routers

The IP address for the SUA can be either fixed or dynamically assigned when a call is connected. In addition, you can designate a server, e.g., a web server, on your local network and make it accessible to outside world.

If you do not define a server, SUA offers the additional benefit of firewall protection. If no server is defined, all incoming inquiries will be filtered out by your Prestige and 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).

3.5.1 Advantages of SUA

In summary:

•SUA is a cost-effective solution for small offices with less than 20 hosts to access the Internet or other remote TCP/IP networks.

•SUA supports one server 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.

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

3-12 Internet Access