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4.3.6.2

Outbound IP Filtering

By default, all outgoing IP traffic from the LAN is allowed. The outbound filter allows

you to create a filter rule to block outgoing IP traffic by specifying a filter name and at

least one condition.

In the

Filtering Options

page, click

Outbound IP Filtering

. The page shown in the

following figure appears.

Click

Add

to add an outbound IP filter. The page shown in the following figure

appears.

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Enter the

Filter Name

and specify at least one of the following criteria: protocol,

source/destination IP address, subnet mask, and source/destination port. Click

Apply

to save the settings.

The

ACTIVE OUTGOING IP FILTER

shows detailed information about each

created outbound IP filter.

4.3.6.3

Bridge Filtering

In the

Filtering Options

page, click

Bridge Filtering

. The page shown in the

following figure appears. This page is used to configure bridge parameters. In this

page, you can change the settings or view some information of the bridge and its

attached ports.

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Click

Add

to add a bridge filter. The page shown in the following figure appears.

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Click

Apply

to save the settings.

4.3.7

DNS

Domain Name System (DNS) is an Internet service that translates domain names

into IP addresses. Because domain names are alphabetic, they are easier to

remember. The Internet, however, is actually based on IP addresses. Each time

you use a domain name, a DNS service must translate the name into the

corresponding IP address. For example, the domain name www.example.com

might be translated to 198.105.232.4.

The DNS system is, in fact, its own network. If one DNS server does not know how

to translate a particular domain name, it asks another one, and so on, until the

correct IP address is returned.

Choose

ADVANCED

>

DNS

. The page shown in the following figure appears.

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62

Figure 8

DNS SERVER CONFIGURATION

If you are using the device for DHCP service on the LAN or if you are using DNS

servers on the ISP network, select

Obtain DNS Info from a WAN interface

.

If you have DNS IP addresses provided by your ISP, enter these IP addresses in

the available entry fields for the preferred DNS server and the alternate DNS

server.

Click

Apply

to save the settings.

4.3.8

Dynamic DNS

The device supports Dynamic Domain Name Service (DDNS). The dynamic DNS

service allows a dynamic public IP address to be associated with a static host

name in any of the many domains, and allows access to a specified host from

various locations on the Internet. Click a hyperlinked URL in the form of

hostname.dyndns.org and allow remote access to a host. Many ISPs assign public

IP addresses using DHCP, so locating a specific host on the LAN using the

standard DNS is difficult. For example, if you are running a public web server or

VPN server on your LAN, DDNS ensures that the host can be located from the

Internet even if the public IP address changes. DDNS requires that an account be