Network Address Translation (Nat); The Nat General Setup Screen; Figure 70 Network > Nat > General - ZyXEL Communications P-660HN FxZ Series User Manual

Chapter 8 Network Address Translation (NAT)
NAT
In the simplest form, NAT changes the source IP address in a packet received from a
subscriber (the inside local address) to another (the inside global address) before forwarding
the packet to the WAN side. When the response comes back, NAT translates the destination
address (the inside global address) back to the inside local address before forwarding it to the
original inside host.
Port Forwarding
A port forwarding 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 NAT makes your whole
inside network appear as a single computer to the outside world.
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 ZyXEL Device 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
• Choose SUA Only if you have just one public WAN IP address for your ZyXEL Device.
• Choose Full Feature if you have multiple public WAN IP addresses for your ZyXEL
Device.
Finding Out More
See Section 8.6 on page 143

8.2 The NAT General Setup Screen

Use this screen to activate NAT. Click Network > NAT to open the following screen.
You must create a firewall rule in addition to setting up SUA/NAT, to allow
traffic from the WAN to be forwarded through the ZyXEL Device.
Figure 70 Network > NAT > General
136
Table 51 on page
for advanced technical information on NAT.
147.
P-660HN-FxZ Series User's Guide