Thomson TCW710 Router Manual PDF (Setup & Configuration Guide)

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Chapter 3: Advanced Configuration

Illustrations contained in this document are for representation only.

43

Forwarding Web Page

For LAN <=> 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 vs 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.28

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Chapter 3: Advanced Configuration

44

Port Triggers Web Page

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 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.29

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 (see Advanced...Forwarding discussion above). 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.

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Chapter 3: Advanced Configuration

Illustrations contained in this document are for representation only.

45

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 6666 over TCP/IP. This destination port is within the Trigger

Range, so the gateway automatically creates a forwarding rule to forward any inbound packets

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.

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Chapter 3: Advanced Configuration

46

DMZ Host Web Page

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.30

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Chapter 3: Advanced Configuration

Illustrations contained in this document are for representation only.

47

Routing Information Protocol Setup Web Page

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.31

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