ZyXEL Communications 681 User Manual
Prestige 681 SDSL Router
4-12
Internet Access
4.9 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.
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.
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.
The IP address for the SUA can be either fixed or dynamically assigned by the ISP. 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, 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).
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, 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).
4.9.1 Advantages of SUA
In summary:
z SUA is a cost-effective solution for small offices to access the Internet or other remote TCP/IP
networks.
z SUA supports servers to be accessible to the outside world.
z SUA can provide firewall protection if you do not specify a server. All incoming inquiries will be
filtered out by your Prestige.
z UDP and TCP packets can be routed. In addition, partial ICMP, including echo and traceroute, is
supported.
4.9.2 Single User Account Configuration
The steps for configuring your Prestige for Single User Account are identical to the conventional Internet
access with the exception that you need to fill in two extra fields in Menu 4 - Internet Access Setup, as
shown next.
access with the exception that you need to fill in two extra fields in Menu 4 - Internet Access Setup, as
shown next.