ZyXEL Communications 2304R-P1 - Manual (Page 86)

Prestige 2304 Support Notes
All contents copyright (c) 2005 ZyXEL Communications Corporation.
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Login Server= 0.0.0.0
IP Address Assignment= Dynamic
IP Address= N/A
IP Subnet Mask= N/A
Gateway IP Address= N/A
Network Address Translation= SUA Only
Key settings:
a. Service Type....... Currently, there are two authentication types that Road Runner supports,
RR-TAS and RR-Manager. Choose the correct one for your local ISP.
b. Server IP............. The Prestige will find the Road Runner server IP if this field is blank, otherwise
enter the authentication server IP address if you know it.
c. My Login Name... Enter the login name given to you by your ISP
d. My Password....... Enter the password associated with the login name
e. WAN IP Address Assignment... If the ISP did not assign you an explicit IP, select Dynamic,
otherwise, select Static.
f. IP Address & Subnet Mask & Gateway IP Address... Enter the IP address, subnet mask & gateway
IP when Static Assignment is selected above.
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 outside . Typically, a company maps its local inside network addresses to one
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, The IP Network Address Translator (NAT) .