ZyXEL Communications P-334WT Technical Information PDF herunterladen (Seite 62)

Using Multi-NAT

● What is Multi-NAT?

● How NAT works

● NAT Mapping Types

● SUA Versus NAT

● SMT Menus

Applying NAT in the SMT Menus

Configuring NAT

Address Mapping Sets and NAT Server Sets

● NAT Server Sets

● Examples

Internet Access Only

Internet Access with an Internal Server

Using Multiple Global IP addresses for clients and servers

Support Non NAT Friendly Applications

● 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 P-334WT, thus preventing intruders from probing your

network.

The SUA feature that the P-334WT supports previously operates by mapping the private IP addresses to

a global IP address. It is only one subset of the NAT. The P-334WT 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

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ZyXEL Communications P-334WT Technical Information Seite 62