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Advanced
NAT
Network Address Translation (NAT) is a technique which allows several
computers on a LAN to share an Internet connection. The computers
on the LAN use a "private" IP address range while the WAN port on the
DWR-923 is configured with a single "public" IP address.
Along with connection sharing, NAT also hides internal IP addresses
from computers on the Internet.
NAT:
Select NAT if your ISP has assigned you only one IP address. The
computers that connect through the DWR-923 will need to be assigned
IP addresses from a private subnet (e.g. 192.168.10.0).
Bridge Mode:
The DWR-923 in bridge mode can act as a bridge and
also filter/inspect packets. It has all the interfaces belonging to the
same LAN segment and you do not have to change other network
settings when you add a transparent device to the network. Select this
option to add your WAN interface to the LAN segment.
Click Apply to apply the changes. Or click Reset to undo your
configurations.
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46
Advanced
NAT
Virtual DMZ
Virtual DMZ (De-Militarized Zone) allows you to specify a DMZ host IP to
redirect requests to a Virtual DMZ host in order to enhance the security of the
local area network.
Virtual DMZ (Enable/Disable):
Enable or disable the Virtual DMZ
function. If this function is enabled, threats from external networks will
be directed to the Virtual DMZ instead of the network.
IP Address of host DMZ:
Enter the IP address of host DMZ.
Click Apply to apply the changes. Or click Reset to undo your
configuration.
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47
Advanced
NAT
Port Mapping
Port Mapping can be used to translate the common service port to a
custom port inside your local network such as web or FTP.
List of Port Mapping Services:
Displays all the port mapping rules for
the DWR-923.
Service
: The name of the service for which the port mapping rule has
been created.
IP Address
: The IP address of the computer on the local network to
which the traffic will be forwarded.
Port Translation
: The port number of the destination host for traffic
forwarding.
Click Add to add a port mapping rule, or select an item and click Edit to
modify or click Delete to delete the selected item.
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Advanced
NAT
UPnP Port Mapping
For devices that support Universal Plug and Play (UPnP), enabling the
UPnP Port Mapping function will allow automatic port forwarding that
helps your UPnP devices communicate with the Internet.
UPnP Settings:
Check the box and click Apply to enable UPnP port
mapping function.
UPnP Portmap Table:
UPnP devices that are applied with the UPnP
port mapping function will be listed in this chart.
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49
Advanced
NAT
Special Applications
While common services use known TCP/UDP ports, many custom or
uncommon applications require traffic to be sent through the firewall.
This section introduces the custom services of the DWR-923.
Service Name:
Name of the service for identification and management
purposes.
Protocol:
The layer 4 protocol that the service uses: TCP, UDP.
Start Port:
The start of the port range for the custom service.
End port:
The end of the port range for the custom service.
Click Add to add a special application, or select an item and click Edit to
modify or click Delete to delete the selected item.
19216811.live