Ip Filtering; Port Filtering - D-Link DCM-604 User Manual

DCM-604 Cable Modem EMTA Gateway User's Manual

5.4.2 IP Filtering

The IP Filtering page enables you to enter the IP address ranges of PCs on
your LAN that you don't permit to have outbound access ability to the WAN.
These PCs can still communicate with each other on your LAN, but packets
they originate to WAN addresses are blocked by the DCM-604.
To enable IP Filtering feature of DCM-604, check the Enable box and click
Apply button.

5.4.3 Port Filtering

The Port Filtering page allows you to enter ranges of destination ports
(applications) that you don't want your LAN PCs to send packets to. Any
packets your LAN PCs send to these destination ports will be blocked. For
example, you could block access to worldwide web browsing (HTTP port 80)
but still allow email service (SMTP port 25 and POP3 port 110).
To enable port filtering, enter the Start port and End port for each range.
Then select its protocol form the drop-down list and check the Enable box,
and click Apply button. To block only one port, set both Start and End ports
the same.
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