ZyXEL Communications P8802T, User Manual

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Basic Home Station VDSL2 P8802T User’s Guide
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H A P T E R
6
Network Address Translation (NAT)
6.1 Overview
This chapter discusses how to configure NAT on the VDSL Router.
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 to a
different IP address known within another network.
6.1.1 What You Can Do in this Chapter
• Use the Virtual Servers screen to forward incoming service requests to the server(s) on your
local network ( Section 6.3 on page 115 ).
• Use the DMZ Host screen to configure a default server ( Section 6.4 on page 118 ).
6.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
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.
Virtual Servers
A virtual 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 NAT makes your whole inside network
appear as a single computer to the outside world.
6.3 The Virtual Servers Screen
Click Advanced Setup > NAT to open the Virtual Servers screen. Use this screen to manage the
list of virtual server rules.