Considerations For Port Forwarding; Wan Setup - NETGEAR CG3000 User Manual

Local IP Address. Enter the local IP address for the computer that uses the service.
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Perform one of these actions:
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Click Add. The Active Forwarding Rules table displays the list of forwarded ports.
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To delete a service, select the radio button in the Active Forwarding Rules table for the
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service that you want to delete, and then click Delete.
To reset the selection in the Services field and to clear all the fields in the Add Custom
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Rules table, click Reset.

Considerations for Port Forwarding

If the IP address of the local server PC is assigned by DHCP, it might change when the
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PC is rebooted. To avoid this, you can assign a static IP address to your server outside
the range that is assigned by DHCP, but in the same subnet as your LAN. By default, the
IP addresses from 192.168.1.2 through 192.168.1.9 are reserved for this purpose.
Local PCs must access the local server using the PCs' local LAN address
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(192.168.1.XXX, by default). Attempts by local PCs to access the server using the
external WAN IP address will fail.
Port forwarding opens holes in your firewall. Only enable ports that are necessary.
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WAN Setup

Select Advanced > WAN Setup to set up a Default DMZ Computer to display the following
screen. A Default DMZ Computer lets you set up a PC that is available to anyone on the
Internet for services that you haven't defined. For security reasons, do this only if you are
willing to risk open access. If you do not assign a Default DMZ Computer, the gateway
discards any undefined service request.
Respond To Ping On Internet Port. If you want the CG3000 to respond to a 'Ping' from the
Internet, click this check box. This can be used as a diagnostic tool.
MTU Size. The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is
1500 Bytes. For some ISPs you may need to reduce the MTU. But this is rarely required, and
should not be done unless you are sure it is necessary for your ISP connection
NETGEAR Wireless Cable Gateway CG3000
Advanced Settings
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