ZyXEL Communications Prestige 310 - Manual (Page 57)

Prestige 310 Broadband Sharing Gateway
SUA and Multiple SUA Servers 4-1
Chapter 4:
SUA and Multiple SUA Servers
This chapter helps you in configuring SUA and setting up multiple inside servers in SUA case.
4.1 Single User Account (SUA)
If you wish to know more about SUA please read on. Or you can skip to the section Single User Account
Configuration for configuring SUA and the section Multiple Servers behind SUA for information about
setting up multiple servers when SUA is enabled.
4.1.1 Basics
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.
Your Prestige accomplishes address sharing by translating the internal LAN IP addresses to a single address
that is globally unique on the Internet. The SUA feature allows you to have the same benefits as having
multiple legal addresses, but allows you to have one legal IP address and many local LAN IP addresses that
can be used in other domains also, thus conserving the number of global IP addresses.
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 in the client side and make them accessible to outside
world.
Figure 4-1 An Example of Single User Account Topology
SUA offers the additional benefit of firewall protection. All incoming inquiries will be filtered out by your
Prestige and thus preventing intruders from probing your network.