Siemens Gigaset SE587 WLAN dsl Specifications download pdf (Page 27)

Advanced configuration

Gigaset SE587 WLAN dsl / eng / A31008-N1083-L171-1-7619 / configure_router.fm / 12.12.2007

Schablone 2005_05_02

URL filter

The URL filter allows you to block or allow access to specific Internet domains.

ì Select the add box to activate the fields in a row to create a new entry.

ì Enter the URL of the domain to be blocked or allowed in the Domain Filter field. The

domain is blocked or allowed including all subdomains.

ì In the Start Time and End Time fields you can define a time period for which the

domain filter should apply.

ì Use the Rule For All Above option to specify if the domains entered in the list should

be blocked or allowed. If you select Allow only the domains contained in the list can

be accessed from the users of your network. If you select Deny only the domains

contained in the list are blocked. All other domains can be accessed.

ì Select the del box to delete an entry from the list.

ì Click Save Settings to apply all your settings on this page.

Applications and Gaming

The Gigaset SE587 WLAN dsl comes equipped with the NAT (Network Address Transla-

tion) function. With address mapping, several users in the local network can access the

Internet via one or more public IP addresses. All the local IP addresses are assigned to

the router's public IP address by default.

One of the characteristics of NAT is that data from the Internet is not allowed into the

local network unless it has been explicitly requested by one of the PCs in the network.

Most Internet applications can run behind the NAT firewall without any problems. For

example, if you request Internet pages or send and receive e-mails, the request for data

from the Internet comes from a PC in the local network and so the router allows the data

through. The router opens precisely one port for the application. A port in this context

is an internal PC address, via which the data is exchanged between the Internet and a

client on a PC in the local network. Communicating via a port is subject to the rules of a

particular protocol (TCP or UDP).

If an external application tries to send a call to a PC in the local network, the router will

block it. There is no open port via which the data could enter the local network.

Some applications, such as games on the Internet, require several links, i.e. several ports

so that the players can communicate with each other. In addition, these applications

must also be permitted to send requests from other users on the Internet to users in the

local network. These applications cannot run if Network Address Translation (NAT) has

been activated.

Using port forwarding (the forwarding of requests to particular ports) the router is

forced to send requests from the Internet for a certain service, for example a game, to

the appropriate port(s) on the PC on which the game is running.

When the Gigaset SE587 WLAN dsl is supplied, the NAT function is activated, i.e. all IP

addresses of PCs in the local network are converted to the router's public IP address

when accessing the Internet.

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Siemens Gigaset SE587 WLAN dsl Specifications Page 27

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