Single User Account; Figure 3-3 Single User Account Topology - ZyXEL Communications P-202 User Manual

Prestige 201 ISDN Access Router
3.5

Single User Account

Typically, if there are multiple users on the LAN wanting to concurrently access the Internet, you will have
to lease a block of legal, or globally unique, IP addresses from the ISP.
The Single User Account (SUA) feature allows you to have the same benefits as having multiple legal
addresses, but only pay for one IP address, thus saving significantly on the subscription fees. (Check with
your ISP before you enable this feature).

Figure 3-3 Single User Account Topology

The Single User Account feature may also be used on connections to remote networks other than the ISP.
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 when a call is connected. 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 and thus preventing intruders from
probing your network.
3-10 Internet Access