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Prestige 782R G.SHDSL Router
Internet Access 3-15
3.6 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). SUA supports popular Internet applications such as MS traceroute,
CuSeeMe, IRC, RealAudio, VDOLive, Quake and PPTP with no extra configuration needed.
Figure 3-8 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. In addition, you can designate
servers, e.g., a web server on your local network and make them accessible to 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.
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).