Using Nat / Multi-Nat - ZyXEL Communications Prestige 2802HW(L)-IX Support Notes

Using NAT / Multi-NAT

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What is Multi-NAT?
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 the
inside
network and the other is the
or more global outside IP addresses and "unmaps" the global IP addresses on incoming packets back into local
IP addresses. The IP addresses for the 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, NAT offers the additional benefit of firewall
protection. In such case, all incoming connections to your network will be filtered out by the Prestige, thus
preventing intruders from probing your network.
The SUA feature that the Prestige supports previously operates by mapping the private IP addresses to a global
IP address. It is only one subset of the NAT. The Prestige with ZyNOS V3.40 supports the most of the features
of the NAT based on RFC 1631, and we call this feature as 'Multi-NAT'. For more information on IP address
translation, please refer to RFC 1631,
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How NAT works
outside
. Typically, a company maps its local inside network addresses to one
The IP Network Address Translator (NAT)
All contents copyright (c) 2007 ZyXEL Communications Corporation.
Prestige 2802HW(L)-Ix Support Notes
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