ZyXEL zyxel Prestige100 User Manual download pdf (Page 56)

44 Configuring for Internet Access

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 subnetwork 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).

This feature may also be used to connect to TCP/IP remote nodes

other than Internet Service Providers. 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 Single User Account can be either fixed or

dynamically assigned by the ISP (or other remote node). In

addition, you can also configure a server, e.g., a Web server, on

your local network and make it accessible by outside users.

If you do not set a server IP address, SUA offers the additional

benefit of firewall protection. This is because if no server is

defined, all incoming inquiries will be filtered out by the Prestige

even if you do have a server on your network. This can prevent

intruders from probing your system.

The 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)

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ZyXEL zyxel Prestige100 User Manual Page 56