The Siemens Gigaset SE587 WLAN dsl is a powerful but easy-to-use communications
device for connecting your PCs or local area network (LAN) to the Internet (via ADSL) or
for connecting a set-top box to watch IPTV. The Gigaset SE587 WLAN dsl contains an
integrated ADSL modem enabling you to access the Internet easily.
You can connect your PCs wirelessly to the Gigaset SE587 WL AN dsl and create a wire-
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less local area network (WLAN). For network security, wireless transmission is encrypted
by default using the WPA standard.
The Gigaset SE587 WLAN dsl allows several users to access the Internet simultaneously.
A single user account can be shared if Tiscali, your Internet service provider, permits
this. If you want to surf the Internet and watch IPTV at the lowest possible cost, the
Gigaset SE587 WLAN dsl is a convenient and simple solution.
The Gigaset SE587 WLAN dsl has an extensive range of functions but remains simple to
use. It can be configured and operational within a few minutes by running the set-up
CD delivered with the device.
The device
Bottom
The label on the bottom of the device shows
the serial number and the preset wireless
security settings (SSID and WPA key).
10/100 Mbps switch sockets
for connecting PCs, set-top
boxes or other Ethernet
devices
Reset button
Socket for connecting the integrated
modem to the ADSL port of the splitter
Reset Button
Reboot function (software reset): Press the button for longer than 1 second but less
than 5 seconds to reboot the device. This does not affect the configuration settings.
Reset function (returns to factory settings): Press and hold the button for at least
5 seconds to return all settings to the factory settings.
Warning: This will clear all the configuration settings you have made since the initial
startup. Do not perform this action without first consulting the Tiscali hotline.
Only use the power supply unit that comes with the device. Using the wrong
The Gigaset SE587 WLAN dsl offers comprehensive security measures:
u Firewall protection against unauthorised access from the Internet
With the firewall, the Gigaset SE587 WLAN dsl offers comprehensive protection
against hacker attacks.
u Network Address Translation (NAT)
All PCs in the local area network use the Public IP address of the Gigaset SE587 WLAN
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dsl for their Internet connections, which makes them 'invisible' on the Internet. The
Gigaset SE587 WLAN dsl only allows access from the Internet if this has been
requested from within the local area network.
u DMZ (Exposed Host)
This allows you to release one PC in your local area network for unlimited access
from the Internet. Note that in this case your local area network will no longer be
adequately protected against Internet attacks.
u Service filtering and domain blocking
The Gigaset SE587 WLAN dsl can filter Internet access. Here you determine which
PCs may access which Internet services.
Additionally you can disable access to certain Internet domains (URL blocking).
u Encryption for the wireless network
The Gigaset SE587 WLAN dsl is delivered with a preset individual encryption
(WPA2-PSK/WPA-PSK with pre-shared key). You will find the corresponding informa-
tion on the label on the bottom of the device. Your wireless network is therefore pro-
tected against unauthorised access.
If there are wireless network adapters of your PCs that do not support this encr yption
method, you can use another encryption method (WEP) to prevent unauthorised
access to your wireless LAN or to make data illegible to unauthorised parties (see
page 23).
Configuring the Gigaset SE587 WLAN dsl
Having performed the installation steps on the set-up CD, your Gigaset SE587 WLAN dsl
is now ready for use. No further configuration is normally required.
Your device is also preconfigured with individual security settings (SSID and encryption)
for secure wireless operation.
However, if you want to change specific configuration settings or make advanced configuration changes to your Gigaset SE587 WLAN dsl, a browser-based configuration
user interface is provided which can be operated via your Internet browser. This is
described from page 10 onwards.
In addition, the user interface provides detailed status information on operation and
configuration and offers helpful administration options. These are described in the
chapters "Status information" on page 12 and "Administration" on page 30.
The individual preset SSID and pre-shared key are shown on the label on the bottom
of the device (see page 4).
Important operation information
If you operate a SIP phone on your Gigaset SE587 WLAN dsl please mind that it will
maintain the Internet connection even if it is in stand-by mode. This can result in
high connection charges if you are on a time-based or volume-based tariff. In this
case it is recommended to use a flat-rate tariff.
Configuring the local network
In order to communicate via the Gigaset SE587 WLAN dsl, the network configuration
may have to be set up correctly on the connected PCs.
This usually occurs automatically with
u Windows Vista (32 and 64)
u Windows XP
u Windows 2000 or
u Mac OS X
operating systems provided you have not made any changes to the standard settings for
the network configuration.
With Windows 98 SE or ME initial network configuration may be necessary.
If you require information on how to configure computers correctly for working in a
Local Network (LAN) or in a Wireless Local Access Network (WLAN), please refer to the
chapter "Local network configuration" on page 36.
Tra dem arks
Microsoft, Windows Vista, Windows XP, Windows 2000 and Internet Explorer are
registered trademarks of Microsoft Corporation.
Mac OS X is a registered trademark of Appel Inc.
Mozilla Firefox is a registered trademark of the Mozilla Organization.
You have performed the steps on the start-up CD and successfully connected a computer to the Gigaset SE587 WLAN dsl. You can now use the browser-based user interface
for a more detailed configuration of the Gigaset SE587 WLAN dsl or to get information
on the configuration and operation. As Internet browser we recommend Microsoft
Internet Explorer V 6.0 or higher, or Mozilla Firefox V 1.0 or higher.
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Note:
To start the configuration environment, you may need to deactivate the HTTP proxy
for your browser.
If you use Window Vista or Windows XP Service Pack 2, you will need to configure the
popup blocker.
If you use a firewall, it must allow connection to the Gigaset SE587 WLAN dsl. For
details, refer to the user guide for your firewall. If necessary deactivate the firewall
while you configure your Gigaset SE587 WLAN dsl.
Starting the user interface
To access the user interface of the Gigaset SE587 WLAN dsl:
ì Start your Internet browser.
ì Enter the IP address of the Gigaset SE587 WLAN dsl in the browser's address field:
http://192.168.1.1
The login screen appears.
The predefined user ID is admin. For your security the configuration program is protected with a password. The default password generally required is admin.
The user interface is opened displaying the Status pages first (see page 12).
The configuration program ends automatically if no entry is made within a time period
of 10 minutes.
Note:
u For security reasons you should change the predefined password at a later stage.
u You can set up more user IDs and assign passwords via the user interface.
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For information on how to set up new user IDs and change the predefined password
see section "Management" on page 30.
User interface functions
The user interface provides the following menus:
StatusYou can view information about the configuration and status
of the Gigaset SE587 WLAN dsl in this menu. This is described
from page 12 onwards.
SetupUse this menu to make the settings required for connecting to
the Internet. You can also make settings for your local network.
This is described from page 15 onwards.
WirelessThis menu allows you to set up your wireless network. You can
make the basic settings (e.g. SSID and channel) and set up
encryption for wireless traffic. This is described from page 20
onwards.
SecurityHere you can enable or disable the firewall of your Gigaset
SE587 WLAN dsl. This is described on page 24.
Access RestrictionYou can restrict the access to the Internet for specific PCs and
for specific services. This is described from page 25 onwards.
Applications and
Gaming
AdministrationThe Gigaset SE587 WLAN dsl user interface provides several
This menu allows you to configure the NAT firewall of the
device. In particular port forwarding and DMZ can be configured (see page 27).
helpful functions for administering your device. This is
described from page 30 onwards.
The user interface screens contain the following buttons:
Transfers the settings you have made to the Gigaset SE587
WLAN dsl configuration.
Deletes all the entries on a screen since the last time you
clicked Save Settings.
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Other buttons may be displayed depending on the function in question. These are
explained in the relevant sections.
Click the help link to display explanations about the current
user interface screen.
Status information
Information about configuration and the status of the Gigaset SE587 WLAN dsl is displayed in the Status menu of the user interface.
Detailed information is available on the following status screens:
u DSL Status
u Internet
u Local Network
u Wireless Network
u Device
The Status pages are updated automatically at regular intervals.
DSL Status
You will find detailed information about the status and operation of the device’s DSL
connection on the DSL Status screen in the Status menu.
This page shows whether the DSL connection has been established successfully. The
DSL connection is active if the parameter Connected has the value ON (green coloured).
The additional information provided on this screen is highly technical and can be used
by service personnel for a detailed analysis and trouble shooting in the case of an error.
ì In the Status menu, select DSL Status.
ì Click Refresh to refresh this screen and update the displayed data.
The Internet page shows information about the configuration of the Internet connection(s).
ì In the Status menu, select Internet.
Internet Status
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PVC ConnectionSelect the virtual connection (PVC), for which the following
information should be displayed. Three PVCs have been
configured. Modification of the factory configuration for
these PVCs can result in loss of service (see page 16).
Internet Connection
Typ e
IP addressPublic IP address currently assigned to the device.
Subnet MaskSubnet mask used in the public network.
MTUMaximum Transmission Unit allowed for data transmission in
Primary DNS serverIP address of the assigned DNS server.
Secondary DNS serverIP address of the alternate DNS server, if available.
Connection type of the selected connection (see page 16).
the network.
PVC Connection
QoS(Quality of Service) ATM Traffic Class used.
Pcr Rate(Peak Cell Rate) Maximum rate at which the sender can send
cells over the virtual connection.
Scr Rate(Sustained Cell Rate) Maximum average rate at which cells
can be sent over the virtual connection.
VCI(Virtual Channel Identifier) Channel and destination that ATM
traffic will use.
VPI(Virtual Path Identifier) Path and destination that ATM traffic
will use.
ì Click Refresh to refresh this screen and update the displayed data.
The Local Network page shows information about the local network settings.
ì In the Status menu, select Local Network.
MAC AddressLocal MAC address of the device’s LAN interface.
IP AddressLocal IP address of the device.
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LAN Subnet MaskSubnet mask used in the local network.
DHCP Server Shows if the DHCP server of the device is enabled or disabled.
Start IP AddressFirst IP address in the IP range which can be assigned to a
client by the DHCP server.
End IP RangeLast IP address in the IP range which can be assigned to a client
by the DHCP server.
The DHCP Server Active IP/MAC Table shows the clients in the network that currently
have been assigned an IP address by the Gigaset SE587 WLAN dsl DHCP server. The following information is displayed for each client:
–IP Address
– MAC Address
– Lease Time (remainig time before the DHCP server will assign a new IP address)
– Host Name
ì Click Refresh to refresh this screen and update the displayed data.
Wireless Network
The Wireless page shows information about the wireless network settings.
ì In the Status menu, select Wireless.
Authentication Security mode used for encryption (see page 21).
EncryptionEncryption method used.
MAC AddressMAC address of the device’s wireless interface.
ModeWireless network mode set for data transmission
(see page 20)
SSID Wireless network ID (see page 20).
Allowed ChannelsChannels which are allowed for wireless communication
Current ChannelRadio channel that is currently being used for data transfer in
the wireless network.
Transmit RateTransmission rate currently set.
Max Frame BurstMaximum time, in microseconds, that the device transmits
RTS ThresholdRTS (Ready to send) Threshold defines the latency between
the message "Ready to send" and the sending of the next data
packet.
ì Click Refresh to refresh this screen and update the displayed data.
Device
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You will find the most important device data on the Device screen in the Status menu.
ì In the Status menu, select Device:
Firmware VersionFirmware version currently installed on your device.
System Time System time for your device.
System Uptime Your device's operating time since the last time the system
was started in the format HH:MM:SS.
ì Click Refresh to refresh this screen and update the displayed data.
Basic configuration
The Setup menu contains all the functions required for setting up your device for connection to the Internet and for establishing your local network.
Basic SetupSet up the Internet connection for one or more virtual connections
(see below).
Local NetworkDefine the basic settings for the local network and configure the
DHCP server (see page 15).
Basic Setup
The Basic Setup page shows the current Internet configuration of your device. In order
to grant access to the Internet to users in your local network, the Internet connection on
your device must be set up correctly. This is performed when you execute the start-up
CD and you do not need to change any parameter on this page.
Note:
The access data is saved in the Gigaset SE587 WLAN dsl during configuration. If the
device is passed on to someone else for any reason, you should always first restore the
factory settings (page 33). Otherwise, unauthorised persons may use your Internet
access at your expense.
The device’s configuration user interface allows you to configure additional Internet
connections if necessary. However, all the settings you make here must coincide with
the features your Internet service provider Tiscali makes available to you. False informa-
tion can lead to problems with your Internet connection. If you want to set up your Internet connection manually or set up additional virtual connections you need your Internet
service provider's access data and technical information for the configuration. You will
find the access data you require in the documentation you received from Tiscali. The
configuration details are not described in this document.
ì In the Setup menu, select Basic Setup.
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At the top of this page you can choose which of the configured interfaces (data PPPoA
or data IPoEoA) should be used for Internet access. This should be set to PPPoA unless
advised otherwise by Tiscali.
PVC selection
The Gigaset SE587 WLAN dsl allows you to configure different virtual connections
(called PVC) which can share the same physical connection (DSL) at the same time. For
each connection the access data of Tiscali is required.
The Tiscali standard connections (data PPPoA, IPTV or data IPoEoA) cannot be changed.
If required, you can change the User Name and the associated Password for the connection.
Configuring further connections
In addition, you can configure a PPPoA or PPPoE connection or a Bridge connection
according to the RFC 2684.
Defining the private IP address for the Gigaset SE587 WLAN dsl
On this screen you can change the device's Private IP address. The preset IP address is
192.168.1.1. This is the address under which the device can be reached in the local network. It can be freely assigned from the block of available addresses. The IP address
under which the Gigaset SE587 WLAN dsl can be reached from outside is assigned by
Tiscali. The default Subnet mask for the local network administered by the Gigaset
SE587 WLAN dsl is 255.255.255.0.
ì If you want to assign a different IP address to the Gigaset SE587 WLAN dsl, enter
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your chosen IP address in the fields next to Local IP address.
Make sure you note which subnet mask is set when assigning the IP address. If you
are retaining the default subnet mask, the first three parts of the IP address must be
identical for all network components (including routers).
We recommend using an address from a block that is reserved for private use. This
address block is 192.168.1.1 to 192.168.255.254.
ì Adjust the Subnet Mask if necessary.
The Subnet mask specifies how many address parts of the IP address must be iden-
tical for all network components (including routers).
Note:
u You can only change the last part of the subnet mask at the moment (even if fur-
ther parts are displayed as editable).
u New settings can only be made after the Gigaset SE587 WLAN dsl has been
rebooted. If necessary reconfigure the IP address on your PC (including one that
is statically assigned) so that it matches the new configuration.
Configuring the DHCP server
The Gigaset SE587 WLAN dsl has a DHCP server for which the factory setting is active.
Consequently, the IP addresses of the PCs are automatically assigned by the Gigaset
SE587 WLAN dsl.
Note:
u If the DHCP server for the Gigaset SE587 WLAN dsl is activated, you can configure
the network setting on the PC so that the option Obtain an IP address automatically is set up. For further information, refer to the section "Local network config-
uration" on page 36.
u If you deactivate the DHCP server, you will have to assign a static IP address for the
PCs that use the network settings.
ì To activate the DHCP server, select ON.
If the DHCP server is active, you can define the IP address range the DHCP server should
use for assigning IP addresses to the clients.
ì Select YES for Use Default Range if you want the device to assign IP addresses in
the range 1-254 (if the router’s IP address is 192.168.1.1 the addresses from
ì Select NO for Use Default Range and define the range of IP addresses the Gigaset
SE587 WLAN dsl should use to automatically assign IP addresses to the PCs. Define
the Start IP Address and the End IP Address.
ì The lease time indicates how long the client may use the allocated IP configuration
before the DHCP server can assign a new IP address. Choose a value from the Client
Lease Time option menu.
DHCP Server fixed IP/MAC Mappings
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Even if you have activated the DHCP server, you can still assign a static IP address to individual PCs (e.g. when setting up these PCs for NAT functions).
ì Select the add box to activate the fields in a row to create a new entry.
ì Enter the IP Address you wish to assign to the PC.
ì Enter the MAC Address of the PC to which you want to assign a static IP address.
ì Enter a specific lease time in seconds for the PC in the Lease Time(Sec) field.
ì Select the del box to delete the entry from the list.
Time Setting
For operating your Gigaset SE587 WLAN dsl, you can set a time server, select the time
zone or set the time and date manually.
ì If a time server is available in your network select the add box and enter the IP
address or host name of the time server in the Server Addess or Hostname field.
ì Select the del box to delete an entry from the list.
ì Select the Time Zone for your location from the list.
ì If you want to enter date and time manually use the Manual Setting Time field.
Enter the value in the format: YYYY:MM:DD:HH:MM:SS.
ì Enable or disable the Daylight Saving option depending on your location.
ì Click Save Settings to apply all your settings on this page.
If you have implemented wireless PC communication via the Gigaset SE587 WLAN dsl,
you should improve the security of your wireless network via the Wireless menu. You
can carry out the following functions:
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Basic Wireless SettingsActivate or deactivate the wireless module of the device
and specify basic settings for your wireless network, for
example SSID or Channel (see below).
Wireless SecuritySet up Encryption for wireless transmissions (see page 21).
Basic Wireless Settings
ì In the Wireless menu, select Basic Wireless Settings.
ì Select Enable for the Wireless Network (default setting).
Devices can only log in wirelessly if the wireless module of the Gigaset SE587 WLAN dsl
is activated.
You can now make the settings for the wireless network.
Wireless Network Mode
Your Gigaset SE587 WLAN dsl provides wireless data transfer according to the IEEE
802.11 standard. The IEEE 802.11g standard permits data transfer up to 54 Mbit/s and
the IEEE 802.11b standard up to 11 Mbit/s. Choose G only to ensure the best possible
data transfer rates in your network. To operate clients with older wireless network
adapters in your network, select MIXED. If you only operate IEEE 802.11b clients in your
network choose Bonly.
ì Select the required Wireless Network Mode for your wireless network.
For the wireless network components to be able to communicate with one another, they
must use the same SSID (Service Set Identifier).
The SSID for the Gigaset SE587 WLAN dsl is individually preset. The preset SSID is shown
on the label on the bottom of the device (see page 4).
You can change the SSID if required and for security reasons you can deactivate SSID
broadcast.
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ì Enter a character string of your choice. The SSID is case-sensitive. It can contain up
to 32 characters. Use a combination of letters, digits and special characters.
Note:
The connection to the wireless network adapters will be interrupted until you have
connected them with the new SSID.
Wireless Channel
All clients in the network use the same radio channel for wireless data transfer.
The channel is selected automatically by default (Auto Channel is enabled). If required,
you can choose manually between various channels, depending on your current location.
To choose the channel manually:
ì Disable the Auto Channel option.
ì Select the Wireless Channel for your wireless network.
Wireless SSID broadcast
If this option is enabled (default setting), the Gigaset SE587 WLAN dsl will send the SSID
in all data transfers and the SSID of the Gigaset SE587 WLAN dsl will be displayed on PCs
that have a wireless network adapter. In this case, hackers could use the SSID to detect
your network.
If you deactivate Wireless SSID broadcast, the SSID of the Gigaset SE587 WLAN dsl will
not be displayed. This increases protection against unauthorised access to your wireless
network. Make a note of the SSID. You will need it to log on to the PC.
ì Select Disable to deactivate Wireless SSID broadcast.
ì Click Save Settings to apply all your settings on this page.
Wireless Security
For your security data transmission in your wireless network is encrypted by default.
Access to your wireless network is only granted to authenticated clients.
The Gigaset SE587 WLAN dsl is delivered with preset individual encryption (WPA-PSK/
WPA2-PSK with pre-shared key). You will find this key on the label on the bottom of the
device.
If all components of your wireless network provide this encryption method there is no
need to change any settings on this page. If not, or if you want to change the preset key
(e. g. if unauthorised persons have access to your device), you can configure the
encryption for your wireless network on this page.
Note:
If you change the encr yption, wirelessly connected clients are disconnected until you
update the security setting on the wireless network adapters again.
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The following security mechanisms are available:
u WPA-PSK/WPA2-PSK (WiFi-Protected Access)
u WEP encryption (Wired Equivalent Privacy)
WPA-PSK (WPA with pre-shared key) offers greater security than WEP. You should therefore select WPA-PSK encryption if it is supported by all components in your wireless network. WPA-PSK is an efficient method for protecting wireless networks. Dynamic keys,
based on the AES (WPA2-PSK) or TKIP (WPA-PSK), offer increased security.
ì In the Wireless Network menu, select Wireless Security.
ì Select the desired encryption method from the Security Mode option menu.
WPA-PSK/WPA2-PSKSelect this option for WPA-PSK or WPA2-PSK encryption.
WEPSelect this option for WEP encryption.
DisabledSelect this option if you want to deactivate the encryption
of the wireless data transmission. It is not recommended to
deactivate encryption.
WPA-PSK and WPA2-PSK
ì Select WPA-PSK/WPA2-PSK from the Security Mode option menu.
ì Enter a key in the WPA Shared key field (up to 32 characters). Use a combination of
letters, digits and special characters.
Note:
Make a note of the key that you have entered. You will need this information to configure the wireless network adapters properly.
If WPA is not supported by all components in your wireless network, we recommend
that you activate WEP Encryption on the components.
You can choose either the standard 64-bit key or the more robust 128-bit key. The keys
are generated in hexadecimal format. You must use the same keys for encryption and
decryption for the Gigaset SE587 WLAN dsl and all your wireless network adapters.
ì Select WEP from the Security Mode option menu.
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ì Select 64 bit or 128 bit from the Key Length option menu.
ì If you don’t use an authentication server in your network keep the value Open Sys-
tem for the parameter Authentication type. Otherwise choose Shared Key.
You can enter up to four keys manually or generate them automatically by means of a
passphrase.
Generating keys by means of a Passphrase
ì Enter a Passphrase (up to 32 characters).
ì Click Generate to create the keys.
Generating keys manually
ì Enter up to four keys in fields Key 1 to Key 4.
– With a 64-bit encryption depth, the key is 10 characters long.
An example of a valid key: 12-34-56-7A-BC
– With a 128-bit encryption depth, the key is 26 characters long.
An example of a valid key: 23-45-67-AB-C8-91-23-45-DE-F1-23-45-67
ì Select one of the four keys as the Default Transmit Key. This is the key which should
currently be used for encryption.
Note:
u It is very important that you make a note of the key(s) that have been entered or
generated. You will need this information to configure the wireless network adapters properly.
u When you have concluded the configuration you must change the WEP encryption
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in the wireless network adapters for the connected PCs in the same way, as they
will not otherwise be given access to the wireless network of the Gigaset SE587
WLAN dsl.
ì Click Save Settings to apply your settings.
Security
The firewall functions of the Gigaset SE587 WLAN dsl include various security functions
for the local network. They are activated by default and configured in the factory. If you
want to deactivate the firewall, carry out the following steps:
ì In the Security menu, select Firewall.
ì Select the OFF option.
ì Click Save Settings to apply your settings.
The Access Restriction function allows you to define rules for blocking access to the
Internet for various services and for one or more PCs. You can permit or block access to
URLs at certain times.
ì In the Access Restrictions menu, select Internet Access.
In the IP filter list you can add the PCs for which access should be restricted.
ì Select the add box to activate the fields in a row to create a new entry.
ì In the Host IP Address field, enter the IP address of the respective PC. How to find
out the IP addresses of the individual PCs is described in chapter "Local network con-
figuration" on page 36.
ì From the Direction option menu, select the kind of communication to which the
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restriction should apply:
inboundInternet access is restricted to outgoing data traffic.
outboundInternet access is restricted to incoming data traffic.
bothBoth incoming and outgoing data traffic with the Internet are
restricted.
ì Select the del box to delete an entry from the list.
Port Filters
In the port filter list you can define ports or port ranges to restrict the access of specific
Internet services. Each Internet service uses a specific port for communication. The following table shows some important port numbers of Internet services:
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.
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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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