25

Field/Header

Description

External Port End

Enter the ending external port number (when you select

Custom Server).

When a service is selected, the port ranges

are automatically configured.

Protocol

TCP, TCP/UDP, or UDP.

Internal Port Start

Enter the internal port starting number (when you select

Custom Server).

When a service is selected the port ranges

are automatically configured

Internal Port End

Enter the internal port ending number (when you select

Custom Server).

When a service is selected, the port ranges

are automatically configured.

5.4.2

Port Triggering

Some applications require that specific ports in the firewall be opened for access by

the remote parties.

Port Triggers dynamically 'Open Ports' in the firewall when an

application on the LAN initiates a TCP/UDP connection to a remote party using the

'Triggering Ports'.

The Router allows the remote party from the WAN side to

establish new connections back to the application on the LAN side using the 'Open

Ports'.

A maximum 32 entries can be configured.

To add a Trigger Port, click

Add

. The following will be displayed.

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Consult the table below for field and header descriptions.

Field/Header

Description

Use Interface

Select the WAN interface from the drop-down box.

Select an Application

Or

Custom Application

User should select the application from the list.

Or

User can enter the name of their choice.

Trigger Port Start

Enter the starting trigger port number (when you select

custom application).

When an application is selected, the

port ranges are automatically configured.

Trigger Port End

Enter the ending trigger port number (when you select

custom application).

When an application is selected, the

port ranges are automatically configured.

Trigger Protocol

TCP, TCP/UDP, or UDP.

Open Port Start

Enter the starting open port number (when you select

custom application).

When an application is selected, the

port ranges are automatically configured.

Open Port End

Enter the ending open port number (when you select

custom application).

When an application is selected, the

port ranges are automatically configured.

Open Protocol

TCP, TCP/UDP, or UDP.

5.4.3

DMZ Host

The DSL router will forward IP packets from the WAN that do not belong to any of

the applications configured in the Virtual Servers table to the DMZ host computer.

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To

Activate

the DMZ host, enter the DMZ host IP address and click

Save/Apply

.

To

Deactivate

the DMZ host, clear the IP address field and click

Save/Apply

.

5.5

Security

To display this function, you must enable the firewall feature in WAN Setup.

For detailed descriptions, with examples, please consult

Appendix A – Firewall

.

5.5.1

IP Filtering

This screen sets filter rules that limit IP traffic (Outgoing/Incoming).

Multiple filter

rules can be set and each applies at least one limiting condition.

For individual IP

packets to pass the filter all conditions must be fulfilled.

NOTE:

This function is not available when in bridge mode. Instead,

MAC Filtering

(pg. 30) performs a similar function.

OUTGOING IP FILTER

By default, all outgoing IP traffic is allowed, but IP traffic can be blocked with filters.

To add a filter (to block some outgoing IP traffic), click the

Add

button.

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On the following screen, enter your filter criteria and then click

Apply/Save

.

Consult the table below for field descriptions.

Field

Description

Filter Name

The filter rule label

Protocol

TCP, TCP/UDP, UDP, or ICMP.

Source IP address

Enter source IP address.

Source Subnet Mask

Enter source subnet mask.

Source Port (port or port:port)

Enter source port number or range.

Destination IP address

Enter destination IP address.

Destination Subnet Mask

Enter destination subnet mask.

Destination Port (port or port:port)

Enter destination port number or range.

INCOMING IP FILTER

By default, all incoming IP traffic is blocked, but IP traffic can be allowed with filters.

29

To add a filter (to allow incoming IP traffic), click the

Add

button.

On the following screen, enter your filter criteria and then click

Apply/Save

.

Consult the table below for field descriptions.