Gateway CGD24G Firewall Rules-Port Forwarding and Port Blocking, Configuring Port Forwarding

		Wireless Cable Modem Gateway CGD24G User Manual
Table 3-1. Services (continued)
Settings			Description
VPN Pass Through			When VPN passthrough is enabled, IPSec and PPTP
			traffic are forwarded. When it is disabled, this traffic is
			blocked.
Multicast			When multicast is enabled, the gateway passes
			multicasting streams through the firewall.
Web Features	Filter Proxy
	Filter Cookies		When enabled, these features are not blocked by the
	Filter Java Applets
			firewall. When disabled, these features are blocked by
			the firewall. You can enable or disable each of these
	Filter ActiveX
			features individually.
	Filter Popup Windows
	Block Fragmented IP
	Packets

3.Click Apply to save your settings.

Firewall Rules—Port Forwarding and Port Blocking

A firewall has two default rules, one for inbound traffic (WAN to LAN) and one for outbound traffic.

•Inbound Rules (Port Forwarding)

These rules restrict access from outsiders. The default rule is to block all access from outside except responses to requests from the LAN side. You can use port forwarding to add predefined or custom rules to specify exceptions to the default rule.

•Outbound Rules (Port Blocking)

These rules control access to outside resources from local users.The default rule is to allow all access from the LAN side to the outside. You can use port blocking to add predefined or custom rules to specify exceptions to the default rules.

Configuring Port Forwarding

Because the gateway uses Network Address Translation (NAT), your network presents only one IP address to the Internet, and outside users cannot directly address any of your local computers. However, by defining an inbound rule you can make a local server (for example, a web server or

Content Filtering and Firewall Rules 3-5

v1.1, May 2009