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Chapter 3 Internet Access Application
3.5 Single User Account
Typically, if there are multiple users on the LAN wanting to concurrently access the Internet, they
will have to subscribe to multiple IP addresses or a Class C sub-network from the ISP. In either
case, these two approaches will cost more than a single user account.
The Single User Account (SUA) feature allows customers to have the same benefits as having a
Class C address, but still only pay for one IP address, thus saving significantly on 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 to connect to TCP/IP remote nodes 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.
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192.168.0.4
192.168.0.5
192.168.0.6
192.168.0.7
IP Address
Assigned by ISP
192.168.0.1
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INTERNET
Ethernet LAN
Same Network
Addresses