ZyXEL Communications Prestige 861H-G1, User Manual

Page: 82 / 275

Prestige 861H User’s Guide
8-4 Network Address Translation (NAT) Screens
Table 8-2 NAT Mapping Types
TYPE IP MAPPING SMT ABBREVIATION
One-to-One ILA1 ÅÆ IGA1 1:1
Many-to-One (SUA/PAT) ILA1 ÅÆ IGA1
ILA2 ÅÆ IGA1
…
M:1
Many-to-Many Overload ILA1 ÅÆ IGA1
ILA2 ÅÆ IGA2
ILA3 ÅÆ IGA1
ILA4 ÅÆ IGA2
…
M:M Ov
Many-to-Many No Overload ILA1 ÅÆ IGA1
ILA2
ÅÆ
IGA2
ILA3 ÅÆ IGA3
…
M:M No OV
Server Server 1 IP ÅÆ IGA1
Server 2 IP ÅÆ IGA1
Server 3 IP ÅÆ IGA1
Server
8.2 SUA (Single User Account) Versus NAT
SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two
types of mapping,
Many-to-One and Server . The Prestige also supports Full Feature NAT to
map multiple global IP addresses to multiple private LAN IP addresses of clients or servers using
mapping types as outlined in
Table 8-2 .
♦ Choose SUA Only if you have just one public WAN IP address for your Prestige.
♦ Choose Full Feature if you have multiple public WAN IP addresses for your Prestige.
8.3 SUA Server
A SUA server set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make visible to the outside world even though SUA makes your whole inside
network appear as a single computer to the outside world.
You may enter a single port number or a range of port numbers to be forwarded, and the local IP
address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can
support more than one service (for example both FTP and web service), it might be better to
specify a range of port numbers. You can allocate a server IP address that corresponds to a port or
a range of ports.
Many residential broadband ISP accounts do not allow you to run any server processes (such as a
Web or FTP server) from your location. Your ISP may periodically check for servers and may
suspend your account if it discovers any active services at your location. If you are unsure, refer
to your ISP.