Nat Introduction - ZyXEL Communications P-2612HNU-Fx Support Notes

After that, the CPE updates the information by periodic queries. The device
implementation of IGMP is also compatible with version 1. The multicast setting can
be turned on or off on the Ethernet and remote nodes.

NAT Introduction

What is NAT?
•
The NAT (Network Address Translation-NAT RFC 1631) is the translation of an
Internet Protocol address used within one network to a different IP address known
within another network. One network is designated as the inside network and the
other is the outside. Typically, one company maps its local inside network addresses
to one or more global outside IP addresses and "unmaps" the global IP addresses on
the incoming packets back into local IP addresses. The IP addresses for NAT can be
either fixed or dynamically assigned by the ISP. In addition, you can designate servers,
e.g., 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, the NAT offers the
additional benefit of firewall protection. In such case, all incoming connections to
your network will be filtered out by the CPE, thus preventing intruders from probing
your network.
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