ZyXEL Communications 2304R-P1 manual What is Multi-NAT?

Prestige 2304 Support Notes

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-TASand 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).

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