ZyXEL Communications PRESTIGE 153 - Manual (Page 67)

Prestige 153/153X WAN Bridge/Routers
Internet Access 3-11
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 3-4 illustrates a typical Single User Account topology.
Figure 3-4. 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.
192.168.1.3
192.168.1.3
192.168.1.3
192.168.1.3
Prestige 153/153X
Modem / ISDN TA INTERNET
Ethernet LAN
192.168.1.1 192.68.135.5
IP Address
Assigned by ISP
Private Network IP Addresses
Assigned by User
Modem
ISDN TA