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Chapter 2: WEB Configuration
Illustrations contained in this document are for representation only.
43
5. Forwarding
For LAN
²
WAN communications, the gateway normally only allows you to originate an IP
connection with a PC on the WAN; it will ignore attempts of the WAN PC to originate a connection
onto your PC. This protects you from malicious attacks from outsiders. However, sometimes you may
wish for anyone outside to be able to originate a connection to a particular PC on your LAN if the
destination port (application) matches one you specify.
This page allows you to specify up to 10 such rules. For example, to specify that outsiders should have
access to an FTP server you have running at 192.168.0.5, create a rule with that address and Start Port
=20 and End Port =21 (FTP port ranges) and Protocol = TCP (FTP runs over TCP and the other
transport protocol, UDP), and click Apply. This will cause inbound packets that match to be forwarded
to that PC rather than blocked. As these connections are not tracked, no entry is made for them in the
Connection Table. The same IP address can be entered multiple times with different
ports.
Fig. 23 Gateway\Advanced\Forwarding
Page 47 / 89
Chapter 2: WEB Configuration
Illustrations contained in this document are for representation only.
44
6. Port Triggers
Some Internet activities, such as interactive gaming, require that a PC on the WAN side of your
gateway be able to originate connections during the game with your game playing PC on the LAN side.
You could use the Advanced-Forwarding web page to construct a forwarding rule during the game,
and then remove it afterwards (to restore full protection to your LAN PC) to facilitate this. Port
triggering is an elegant mechanism that does this work for you, each time you play the game.
Fig. 24 Gateway\Advanced\Port Triggers
Port Triggering works as follows. Imagine you want to play a particular game with PCs somewhere on
the Internet. You make one time effort to set up a Port Trigger for that game, by entering into
Trigger
Range
the range of destination ports your game will be sending to, and entering into
Target Range
the range of destination ports the other player (on the WAN side) will be sending to (ports your PC’s
game receives on). Application programs like games publish this information in user manuals. Later,
each time you play the game, the gateway automatically creates the forwarding rule necessary. This
rule is valid until 10 minutes after it sees game activity stop. After 10 minutes, the rule becomes
inactive until the next matched outgoing traffic arrives.
For example, suppose you specify Trigger Range from 6660 to 6670 and Target Range from 113 to
113. An outbound packet arrives at the gateway with your game-playing PC source IP address
192.168.0.10, destination port 666 over TCP/IP. This destination port is within the Trigger destined for
port 113 to your game-playing PC at 192.168.0.10.
You can specify up to 10 port ranges on which to trigger.
Page 48 / 89
Chapter 2: WEB Configuration
Illustrations contained in this document are for representation only.
45
7. DMZ Host
Use this page to designate one PC on your LAN that should be left accessible to all PCs from the
WAN side, for all ports. For example, if you put an HTTP server on this machine, anyone will be able
to access that HTTP server by using your gateway IP address as the destination. A setting of “0”
indicates NO DMZ PC. “Host” is another Internet term for a PC connected to the Internet.
Fig. 25 Gateway\Advanced\DMZ Host
Page 49 / 89
Chapter 2: WEB Configuration
Illustrations contained in this document are for representation only.
46
8. RIP (Routing Information Protocol) Setup
This feature enables the gateway to be used in small business situations where more than one LAN
(local area network) is installed. The RIP protocol provides the gateway a means to “advertise”
available IP routes to these LANs to your cable operator, so packets can be routed properly in this
situation.
Your cable operator will advise you during installation if any setting changes are required here.
Fig. 26 Gateway\Advanced\RIP Setup
Page 50 / 89
Chapter 2: WEB Configuration
Illustrations contained in this document are for representation only.
47
Gateway – Firewall Web Page Group
1. Web Content Filtering
These pages allow you to enable, disable, and configure a variety of firewall features associated with
web browsing, which uses the HTTP protocol and transports HTML web pages. On these pages, you
designate the gateway packet types you want to have forwarded or blocked. You can activate settings
by checking them and clicking Apply.
The web-related filtering features you can activate from the Web Content Filter page include Filter
Proxy, Filter Cookies, Filter Java Applets, Filter ActiveX, Filter Popup Windows, and Firewall
Protection.
If you want the gateway to exclude your selected filters to certain computers on your LAN, enter their
MAC addresses in the Trusted Computers area of this page.
Fig. 27 Gateway\Firewall\Web Filter

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