10.2 NAT

The NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in a packet. The default setting is Dynamic NAPT. It provides dynamic Network Address Translation capability between LAN and multiple WAN connections, and the LAN traffic is routed to appropriate WAN connections based on the destination IP addresses and Route Table. This eliminates the need for the static NAT session configuration between multiple LAN clients and multiple WAN connections.

Field

Meaning

 

 

Virtual Circuit

VPI (Virtual Path Identifier) and VCI (Virtual Channel

 

Identifier) define a virtual circuit. There are eight

 

groups of PVC can be defined and used

Number of IPs

User can select Single or Multiple

10.2.1 DMZ

The DMZ Host is a local computer exposed to the Internet. When setting a particular internal IP address as the DMZ Host, all incoming packets will be checked by the Firewall and NAT algorithms then passed to the DMZ host, when a packet received does not use a port number used by any other Virtual Server entries.

Field

Meaning

DMZ

Disabled: As set in default setting, it disables the DMZ

 

function.

 

Enabled: It activates your DMZ function.

DMZ Host Address

Give a static IP address to the DMZ Host when Enabled

 

radio button is checked. Be aware that this IP will be

 

exposed to the WAN/Internet.

10.3 Virtual Server

In TCP/IP and UDP networks a port is a 16-bit number used to identify which application program (usually a server) incoming connections should be delivered to. Some ports have numbers that are pre-assigned to them by the IANA (the Internet

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