Firewall Tab

41

1.

In the

Application Name

field, enter a name for the application profile. You can enter any name you like,

although it’s recommended that you use the name of the application (for example, Redwing Game

Server).

2.

In the Definition panel, create a definition for your application.

A definition consists of a series of protocol-specific ports that are to be allowed through the firewall.

This information should be contained in the documentation provided by the company that produces the

application.

a.

In the

Protocol

field, select the

TCP

or

UDP

radio button. If the application you are adding requires

both, you must create a separate definition for each.

b.

In the

Port (or Range)

field, enter the port or port range the application uses.

For example, some applications may require only one port to be opened (such as TCP port 500);

others may require that all TCP ports from 600 to 1000 be opened.

c.

In the

Protocol Timeout (seconds)

field, you may optionally enter a value for the amount of time that

can pass before the application “times out.” You can also leave the field blank, in which case the

system uses the default values (86,400 seconds for the TCP protocol; 600 seconds for the UDP

protocol).

d.

In the

Map to Host Port

field, enter a value that will map the port range you established in step b to

the local computer. For example, if you set the value to 4000 and the range being opened is 100 to

108, the forwarded data to the first value in the range will be sent to 4000. Subsequent ports will

be mapped accordingly; 101 will be sent to 4001, 102 will be sent to 4002, etc.

e.

From the

Application Type

drop-down menu, select the application type. If you do not know the

application type, select None (Default).

3.

Click

ADD DEFINTION

to add the values to the profile definition list.

4.

Click

DONE

.

Repeat these steps for each port or range of ports required for the application profile.

To edit or delete an application profile:

•

Open a Web browser and access the 2Wire gateway user interface by entering

•

Click the

Firewall

tab.

•

Click the Firewall Settings

link under the tab to open the Edit Firewall Settings page.

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42

•

In the Applications panel, click the

Edit or delete user-defined application

link. The Select a Hosted

Application page opens.

Figure 19. Select a Hosted Application Page

1.

In the User-Defined Application Profiles panel, highlight the application you wish to edit or delete.

f.

To edit the application profile, click

EDIT

. The Edit Application screen appears. Make the necessary

changes to the application profile and click

DONE

.

g.

To delete the application profile, click

DELETE

.

Allowing all Applications (DMZplus)

DMZplus is a special firewall mode that is used for hosting applications if you cannot get an application to

work properly using the “Allow individual application(s)” option. When in DMZplus mode, the designated

computer:

•

Shares your gateway’s IP address (Router Address).

•

Appears as if it is directly connected to the Internet.

•

Has all of the unassigned TCP and UDP ports opened and pointed to it.

•

Can receive unsolicited network traffic from the Internet.

Although the computer in DMZplus mode appears to Internet users as though it is directly connected to the

Internet, it is still protected by your system firewall. All traffic is inspected by the firewall’s Stateful Packet

Inspection engine and all known hacker attacks continue to be blocked.

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43

Because all filtered traffic is forwarded to the designated computer, you should use DMZplus mode with

caution. A computer in DMZplus mode is less secure because all available ports are open and all incoming

Internet traffic is directed to this computer.

To configure DMZplus:

•

Open a Web browser and access the 2Wire gateway user interface by entering

•

Click the

Firewall

tab.

•

Click the Firewall Settings

link under the tab to open the Edit Firewall Settings page.

Figure 20. Edit Firewall Settings Page

1.

From the

Select a computer

pull-down menu, select the computer to which you would like to have all data

sent.

2.

Click

Allow all applications (DMZplus mode)

.

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44

3.

Click

DONE

.

4.

Access the computer that you selected in step 1.

5.

Confirm that the computer is configured for DHCP

. If it is not, configure it for DHCP

.

6.

Restart the computer. When the computer restarts, it receives a special IP address from the system

and all unassigned TCP and UDP ports are forwarded to it.

To stop DMZplus:

1.

From the

Select a computer

pull-down menu, select the computer for which you would like to disable

DMZplus.

2.

In the Edit firewall settings for this computer pane, click

Maximum protection

.

3.

Click

DONE

.

4.

Access the computer that you selected in step 1. If the computer will continue to automatically obtain

an IP address, proceed to step 5. If the computer will have a static IP address, configure it with a valid

static IP address.

5.

Restart the computer.

Viewing the Firewall Log

The 2Wire gateway keeps a log of all firewall-related events that occur. Each log entry contains the date and

time the event occurred, the severity level of the event, and details about the event.

To view the log:

•

Open a Web browser and access the 2Wire gateway user interface by entering

•

Click the

Firewall

tab.

Firewall Tab

45

•

Click the Firewall Log

link under the tab to open the View Firewall Log page.

Figure 21. View Firewall Log Page

The following table provides additional information about the log entries.

Click

CLEAR LOG

to clear the log.

Severity

•

Info. Informational only—the event does not imply a

threat to network security.

•

Low. Occurs when the firewall detects a low-level threat

to the network, such as an invalid IP header or invalid

packet length.

•

Medium. Occurs when a medium-level threat is detected,

such as an invalid IP fragment offset.

•

High. Occurs when an attack is launched against the

network (for example, a SYN Flood).

Details

Includes the following information:

•

The IP address from which the packet originated.

•

The destination IP address of the packet.

•

The action that was taken.