Please check

www.sitecom.com

for up to date drivers & utilities, manuals and support

31

7 Firewall Settings

Firewall contains several features that are used to deny or allow traffic from passing through

the device.

7.1 Port Forwarding

Firewall keeps unwanted traffic from the Internet away from your LAN computers. Add a Port

Forwarding entry will create a tunnel through your firewall so that the computers on the

Internet can communicate to one of the computers on your LAN on a single port.

Field

Description

Enable Port

Forwarding

Check this item to enable the port-forwarding feature.

Protocol

There are 3 options available: TCP, UDP and Both.

Enable

Check this item to enable this entry.

Local IP Address

IP address of your local server that will be accessed by Internet.

Port

The destination port number that is made open for this application on

the LAN-side.

Sitecom ADSL2+ Modem DC-227

32

Remote IP Address

The source IP address from which the incoming traffic is allowed. Leave

blank for all.

External Port

The destination port number that is made open for this application on

the WAN-side

Interface

Select the WAN interface on which the port-forwarding rule is to be

applied.

Apply Changes

Click to save the rule entry to the configuration.

Delete Selected

Delete the selected port forwarding rules from the forwarding table. You can click the

checkbox at the

Select

column to select the forwarding rule.

Delete All

Delete all forwarding rules from the forwarding table.

Please check

www.sitecom.com

for up to date drivers & utilities, manuals and support

33

7.2 URL Blocking

The URL Blocking is the web filtering solution. The firewall includes the ability to block access

to specific web URLs based on string matches. This can allow large numbers of URLs to be

blocked by specifying only a FQDN (such as tw.yahoo.com). The URL Blocking enforce a Web

usage policy to control content downloaded from, and uploaded to, the Web.

Field

Description

URL Blocking

capability

Check this item to enable the URL Blocking feature.

FQDN

A

fully qualified domain name

(or

FQDN

) is an unambiguous

domain

name

that specifies the node's position in the

DNS

tree hierarchy

absolutely, such as tw.yahoo.com. The FQDN will be blocked to access.

Keyword

The filtered keyword such as yahoo. If the URL includes this keyword,

the URL will be blocked to access.

Apply Changes:

Click to disable/enable the URL Blocking capability

Add FQDN:

Add FQDN into URL Blocking table.

Delete Selected FQDN:

Delete the selected FQDN from the URL Blocking table. You can

click the checkbox at the

Select

column to select the Blocked

FQDN.

Sitecom ADSL2+ Modem DC-227

34

7.3 DMZ

A DMZ (Demilitarized Zone) allows a single computer on your LAN to expose ALL of its ports

to the Internet. Enter the IP address of that computer as a DMZ (Demilitarized Zone) host

with unrestricted Internet access. When doing this, the DMZ host is no longer behind the

firewall.

Field

Description

Enable DMZ

Check this item to enable the DMZ feature.

DMZ Host IP

Address

IP address of the local host. This feature sets a local host to be exposed

to the Internet.

Apply Changes

Click to save the setting to the configuration.

Please check

www.sitecom.com

for up to date drivers & utilities, manuals and support

35

7.4 IP Filtering

The IP/Port filtering feature allows you to deny/allow specific services or applications in the

forwarding path.

Field

Description

Outgoing Default

Action

Specify the default action on the LAN to WAN forwarding path.

Incoming Default

Action

Specify the default action on the WAN to LAN forwarding path.

Apply Changes

Click to save the setting of default actions to the configuration.