Port Blocking - NETGEAR CG834WG User Manual

Considerations for Port Forwarding
• If the IP address of the local server PC is assigned by DHCP, it may change when the 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 the rest of your LAN. By default, the IP
addresses in the range of 192.168.0.2 through 192.168.0.9 are reserved for this.
• To access the local server, each PC must use its local LAN address (192.168.0.XXX, by
default). Attempts by local PCs to access the server using the external WAN IP address will
fail.
Remember that allowing inbound services opens holes in your firewall. Only enable those ports
that are necessary for your network. The following are two application examples of inbound rules.

Port Blocking

You can use this screen to block outbound traffic on specific ports.
Note: Any outbound traffic that is not blocked by rules you create is allowed by the
default rule.
Select Port Blocking under the Advanced Heading, and the following screen displays:
Figure 3-5
The selections on the Port Blocking screen are:
• Active Filters. This table displays a list of ports that are currently blocked.
• Add Predefined Service. To block outbound traffic, select the service you would like to block
from the drop-down list of predefined services. Click Add.
Wireless Cable Modem Gateway CG834WG User Manual
v1.0, October 2007
3-7