What Is Multi-Nat; When Do I Need Multi-Nat - ZyXEL Communications Prestige 2602H-6xC Support Notes

To create the appearance of faster network access, service companies plan to store or "cache" frequently
requested web sites and Usenet newsgroups on a server at their head-end. Storing data locally will remove some
of the bottleneck at the backbone connection.
How fast can they go? In a perfect world (or lab) they can receive data at speeds up to 30 Mbps. In the real
world, with cost conscious cable companies running the systems, the speed will probably fall to about 1.5
Mbps.

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 V3.00 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,

When do I need Multi-NAT?

a. Make local server accessible from outside Internet
When NAT is enabled the local computers are not accessible from outside. You can use Multi-NAT to make an
internal server accessible from outside.
a. Support Non-NAT Friendly Applications
Some servers providing Internet applications such as some mIRC servers do not allow users to login using the
same IP address. Thus, users on the same network can not login to the same server simultaneously. In this case
it is better to use Many-to-Many No Overload or One-to-One NAT mapping types, thus each user login to the
server using a unique global IP address.
outside
. Typically, a company maps its local inside network addresses to one
The IP Network Address Translator (NAT)
All contents copyright (c) 2005 ZyXEL Communications Corporation.
Prestige 2602H-6xC Support Notes
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