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ZyXEL VMG8825-Bx0B Manual

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Chapter 11 Network Address Translation (NAT)
VMG/XMG Series User’s Guide
245
when the packet is still in the local network, while an inside global address (IGA) is the IP address of the
same inside host when the packet is on the WAN side. The following table summarizes this information.
NAT never changes the IP address (either local or global) of an outside host.
11.8.2 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 address
(either local or global) of an outside host is never changed.
The global IP addresses for the inside hosts can be either static or dynamically assigned by the ISP. In
addition, you can designate servers, for example, a web server and a telnet server, on your local
network and make them accessible to the outside world. If you do not define any servers (for Many-to-
One and Many-to-Many Overload mapping), NAT offers the additional benefit of firewall protection.
With no servers defined, your Zyxel Device filters out all incoming inquiries, thus preventing intruders from
probing your network. For more information on IP address translation, refer to RFC 1631, The IP Network
Address Translator (NAT).
Table 87 NAT Definitions
ITEM DESCRIPTION
Inside This refers to the host on the LAN.
Outside This refers to the host on the WAN.
Local This refers to the packet address (source or destination) as the packet travels on the LAN.
Global This refers to the packet address (source or destination) as the packet travels on the WAN.
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