ZyXEL Router Prestige 334 User Manual

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Network Address 
TranslationNetwork Address Translation (NAT) allows the translation of an Internet 
protocol address used within one network (for example a private IP address 
used in a local network) to a different IP address known within another network 
(for example a public IP address used on the Internet). 
Choose None to disable NAT.
Choose SUA Only if you have a single public IP address. SUA (Single User 
Account) is a subset of NAT that supports...

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6.6  Configuring WAN MAC
To change your Prestige’s WAN MAC settings, click WA N, then the WAN MAC tab.  The 
screen appears as shown.
Figure 23   MAC Setup
The MAC address screen allows users to configure the WAN ports MAC address by either 
using the factory default or cloning the MAC address from a computer on your LAN. Choose 
Factory Default to select the factory assigned default MAC Address.
MulticastChoose None (default), IGMP-V1 or IGMP-V2. IGMP...

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Otherwise, click Spoof this computers MAC address - IP Address and enter the IP address 
of the computer on the LAN whose MAC you are cloning. Once it is successfully configured, 
the address will be copied to the rom file (ZyNOS configuration file). It will not change unless 
you change the setting or upload a different ROM file.
  It is recommended that you clone the MAC 
address prior to hooking up the WAN Port.
6.7  Traffic Redirect
Traffic redirect...

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Figure 25   Traffic Redirect LAN Setup
6.8  Configuring Traffic Redirect
To change your Prestige’s Traffic Redirect settings, click WA N, then the Traffic Redirect 
tab.  The screen appears as shown.
Figure 26   WAN: Traffic Redirect
The following table describes the labels in this screen.
Table 20   Traffic Redirect
LABELDESCRIPTION
ActiveSelect this check box to have the Prestige use traffic redirect if the normal WAN 
connection goes down.
Backup...

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MetricThis field sets this routes priority among the routes the Prestige uses. 
The metric represents the cost of transmission. A router determines the best route 
for transmission by choosing a path with the lowest cost. RIP routing uses hop count 
as the measurement of cost, with a minimum of 1 for directly connected networks. 
The number must be between 1 and 15; a number greater than 15 means the link 
is down. The smaller the number, the lower the...

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CHAPTER7
Network Address Translation
(NAT) Screens
This chapter discusses how to configure NAT on the Prestige.
7.1  NAT Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a 
host in a packet. For example, the source address of an outgoing packet, used within one 
network is changed to a different IP address known within another network. 
7.1.1  NAT Definitions
Inside/outside...

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7.1.2  What NAT Does
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. Note that the IP...

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Figure 27   How NAT Works
7.1.4  NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical 
LANs using IP Alias) behind the Prestige can communicate with three distinct WAN 
networks. More examples follow at the end of this chapter. 

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Figure 28   NAT Application With IP Alias
7.1.5  NAT Mapping Types
NAT supports five types of IP/port mapping. They are:
•One to One: In One-to-One mode, the Prestige maps one local IP address to one global 
IP address.
•Many to One: In Many-to-One mode, the Prestige maps multiple local IP addresses to 
one global IP address. This is equivalent to SUA (i.e., PAT, port address translation), 
ZyXEL’s Single User Account...