Gigaset SE515 dsl / englisch / A31008-E515-Bxxx-1-7619 / cover_front.fm / 28.05.2004

Contents

Safety precautions. 5 The Gigaset SE515 dsl. 6
Wired local area network (Ethernet). 8 Wireless local area network (WLAN). 9 Features and applications. 11

First Steps. 14

System requirements. Package contents. Operating displays and connections. Front panel. Back panel. Setting up the Gigaset SE515 dsl. Connecting with the splitter. Creating a LAN connection. Activating. 21
Configuring the local area network. 22
Setting up a PC as a Client for Microsoft Networks. Selecting a computer name and workgroup. Installing the TCP/IP protocol. TCP/IP protocol settings. Deactivating the http proxy. Synchronising the TCP/IP settings with the Gigaset SE515 dsl. Network configuration with Windows XP. Configuring the network. Selecting a computer name and workgroup. Checking the network settings and completing the installation procedure. TCP/IP protocol settings. Deactivating the http proxy. Synchronising the TCP/IP settings with the Gigaset SE515 dsl. Network configuration with Windows 2000. Installing network services. Selecting a computer name and workgroup. Installing the TCP/IP protocol. TCP/IP protocol settings. Deactivating the http proxy. Synchronising the TCP/IP settings with the Gigaset SE515 dsl. Checking the connection to the Gigaset SE515 dsl. 48

The user interface. 49

Launching the user interface. 49 UI elements. 51
General configuration with Installation Setup. 53
Select your country. 53 Internet connection via PPP. 56 Internet connection via IP. 58
Configuring security measures. 62
Assign password. Setting the security features for the wireless network. WEP encryption. WPA encryption. 64 66
Configuration with Advanced Setup. 72
Basic. Setting the wireless security. Access control to local area network. Defining the router's private IP address. Using the universal plug and play function. Configuring the DHCP server. Internet configuration. ADSL settings. IP Routing configuration. Static Route. Dynamic routing. DNS server. Setting up the NAT function. Setting up Port Forwarding. Opening the firewall for selected PCs (DMZ). Activating dynamic DNS. Configuring the firewall. Filtering services. 89 89
Administration tasks and status information. 91
Manually opening an Internet connection. 91 Setting the time and time zone. 93 Router management. 94 Assigning a password. 95 Setting Remote-Management. 95 Changing the Web server port. 96 IGMP proxy configuration. 96 Saving and restoring a configuration. 98 Resetting the router. 99 Displaying the router's status. 100 System log. 101

Appendix. 103

Fault tracing. 103
Specifications. 106 Service (Customer Care). 107

Glossary. 111 Index. 122

Safety precautions
u Only use the mains adapter (16V AC 1A) supplied with the Gigaset SE515 dsl. Com-

u u u u u

ply with the connection values and ratings when connecting the device to the mains. Protect the equipment from moisture. Never open the device. For electrical safety reasons it may only be opened by authorised service technicians. The router may affect medical equipment. Take account of the technical conditions in the relevant environment. Make sure you include these operating instructions when you pass on your Gigaset SE515 dsl to someone else. Please dispose of the Gigaset SE515 dsl in an environmentally friendly manner.

In a wired local area network the PCs are linked via an Ethernet cable. The Siemens Gigaset SE515 dsl has four Ethernet LAN ports for connecting four PCs. The PCs must have an Ethernet network adapter that is connected via an Ethernet cable to a LAN port on the router. New PCs frequently come supplied with such a socket. You can buy Ethernet cables (CAT-5) from specialist retailers.

Ethernet

The Gigaset SE515 dsl has a DSL interface that permits simultaneous access of all the PCs to the Internet. To use this feature you will need the access data from an Internet Service Provider.
Wireless local area network (WLAN)
In a wireless local area network (WLAN) the PCs are linked to each other via a wireless connection. The PCs must have a wireless network adapter (WLAN adapter such as the Gigaset PC Card 54 or Gigaset PCI Card 54). We generally differentiate between two types of wireless networks: Ad-hoc mode An ad-hoc network is a wireless network set up without using a router. The mobile network components that communicate with each other directly set up the network "adhoc", i.e. as and when required. Infrastructure mode The infrastructure mode is used to connect wireless and wired networks with each other. In addition to the mobile stations, the infrastructure mode needs an access point, such as the Gigaset SE515 dsl, also known as a base station. In infrastructure mode, the stations on the network always communicate with each other via an access point. Unlike the ad-hoc mode, the access point sets up the wireless network on a permanent basis, and every station that wants to be part of the wireless network has to register with the access point before it is allowed to exchange data. Using an access point also extends the range of the wireless network. The access point establishes the connection from the mobile stations of a wireless network to a wired LAN (Ethernet) or to the Internet. In this case, this is referred to as the router functionality of the device. The access point sends data packets that are not addressed to stations in its network "outside" and passes data packets coming from "outside" to the appropriate station in its network. You can use the Gigaset SE515 dsl for connecting

Configuring the network

Configuring the network in this case means selecting Internet connection as the connection method. You can do this with the network wizard.
Select Start Control Panel. Select Network and Internet Connections. Now select Set up or modify home network or small office network.
This launches the network wizard.
Skip the welcome screen and the checklist by clicking on Next each time.
You will be prompted to select a connection method.
Select Other Method and confirm with Next.
You will now see a screen listing various connection methods
Select This computer connects directly to the Internet. The other computers on
my network connect to the Internet through this computer. and click on Next.
In the next window select your network adapter and click on Next. Skip the message "This network configuration is not advisable" with Next.
Enter the name the PC is to appear under in the network. This name must be unique
within the network. You can complete the Computer description box or leave it empty. Then click on Next. identical for all the PCs in the network. Continue with Next.
Enter a name for the workgroup the computer is to belong to. This name must be
Checking the network settings and completing the installation procedure
You will now see a screen in which you can check the settings you have made and make any changes you want.
Click on Back if you want to make any changes or click on Next if you want to leave
them unchanged. If you do not want to install any more PCs:
Select Only finish the wizard, as it is not run on other computers and confirm

twice with Next.

Answer the prompt Do you want to restart your computer now? with Yes.
If you want to set up a network on other PCs with Windows XP, you can now create a network installation disk.
Select Create a network installation disk and click on Next. Follow the screen instructions and insert a disk. The necessary data will now be copied. Now label the disk as Network installation. rebooting the PC.
Confirm the next two screens with Next and complete the installation procedure by
After this your "home network" will have been installed. To set up the network on the other PCs with the same settings, insert the disk in the drive and run Netsetup with a double click.

The user interface

Once you have configured the network settings on a PC in your local area network, you can then use that PC to configure the Gigaset SE515 dsl with the router's user interface. The Gigaset SE515 dsl can be configured using any browser that supports Java, e.g. Microsoft Internet Explorer 5.5 or higher, Netscape Navigator 7.0 or higher.
Launching the user interface
To access the Gigaset SE515 dsl's user interface:
Launch your Web browser. Enter the router IP address in the Web browser address bar.
http://192.168.1.1 You will then see a login window:
Click on LOGIN (the default is no password).
Please note: For security reasons you should assign a password at a later stage (see page 62). You will now see the start page.

The start page

The start page is the starting point for all configuration and administration activities.
Selecting the language If you wish to change the default user interface language, select the required language from the Select your language pick list. Functions of the start page In the start page you can
u open an Internet connection (see page 91), u change the account of the Internet connection (see page 92), u view status: information about the router (see page 100), u make configuration settings for the router with the Installation Setup, Security

Setup or Advanced Setup.

Installation Setup Security Setup
Use Installation Setup for the basic settings required for connecting to the Internet. This is described from page 53 on. The Security Setup allows you to take precautions against unauthorised access to your router and LAN. For example, you can assign a password and set up encryption for wireless transmissions. This is described from page 62 on. For the protection of your network we recommend that you carry out this setup. Advanced Setup provides additional functions. For example, you can back up and restore your configuration data, set up your router as a virtual server for your network, and much more. These configuration steps are optional and can be carried out at a later stage. This is described from page 72 on.

Advanced Setup

UI elements
The UI pages contain the following elements:

Title bar

Navigation bar

Working area

Buttons
Title bar The title bar indicates whether you are in Installation Setup, Security Setup or Advanced Setup, or whether a status page is open. Additionally you can use the button to finish your configuration and return to the login screen. Navigation bar The navigation bar always displays Home. It finishes the setup or closes the status screen and returns to the start screen. In Advanced Setup, the navigation bar also lists the configuration options of the Gigaset SE515 dsl. Clicking on an option opens a menu in which you can select the function you want. If you have opened the router's status screen, the navigation bar lists all of the topics on which you can view information. Click on the topic you require and the page with the information opens.

Working area Use the working area for configuration. With configurable parameters you will see a dialog box or selection list with default settings. There may be some limitations on the possible entries, e.g. entering special characters or certain value ranges. If your entry does not meet the rules for the box in question, you will see an error message. You can then repeat the input. If you need information about a screen, click on HELP to view help about the displayed screen. As soon as you have changed the configuration in a screen, you can activate the new setting by clicking on APPLY or NEXT at the bottom of the screen. Please note: Please read the following information if you are using Internet Explorer 5.0. Once you have entered the command, the screen will be properly updated if you have configured Internet Explorer as follows: In Tools Internet Options General Temporary Internet Files Settings the setting for Check Newer Versions should be set to Every Visit. Buttons Installation Setup and Security Setup: NEXT BACK CANCEL FINISH HELP Advanced Setup: APPLY CANCEL HELP Opens the screen for the next configuration step. Returns to the previous configuration step. Clears all the entries on a screen since the last time it was opened. Transfers the settings you have made to the router configuration. Displays help information about the current screen. Transfers the settings you have made to the router configuration. Deletes all the entries in a screen since the last time APPLY was run. Displays help information about the current screen.
Other buttons may be visible depending on the function in question. These are described in the relevant sections.
General configuration with Installation Setup
Use Installation Setup for the general configuration of the Gigaset SE515 dsl. This includes the settings for the DSL interface. The router's DSL interface is used to provide a connection to the Internet for all the PCs connected to the router. For the setup you will need the access data you have received from your Internet Service Provider. Please have this data to hand. Please note: The Installation Setup procedure will reconfigure your WAN and LAN configuration if already performed. The wireless LAN settings are not affected. Remember that configuration saves the access data in the router. Before passing your router on to somebody else or having your dealer replace it, you should first restore the factory settings (see page 16). Otherwise unauthorised persons may use your Internet access data at your expense. The router user interface guides you through configuration step by step. Once you have completed a screen, click on NEXT. If you want to make any changes or check your entries, click on BACK.

You can choose either the standard 64-bit key or the more robust 128-bit key for encryption. The keys are generated in hexadecimal format or in the ASCII format. You must use the same keys for encryption and decryption for the Gigaset Router and all your wireless network adapters.
Select the encryption mode: 64 or 128-bit.
The Web page then has an added section where you can enter the key. The following illustration shows the page after selecting a 128-bit key.
If you choose Hexadecimal, you can use characters 0 to 9 and A to F. With an encryption depth of 64 bits, the key is exactly 10 characters long. An example of a valid key would be: 1234567ABC. With an encryption depth of 128 bits, the key is exactly 26 characters long. An example of a valid key would be: 234567ABC8912345DEF1234567. If you choose ASCII, you can use characters 0 to 9 and A to F and the special characters of the ASCII character set. With an encryption depth of 64 bits, the key is exactly 5 characters long. An example of a valid key would be: GIGA1. With an encryption depth of 128 bits, the key is exactly 13 characters long. An example of a valid key would be: GIGASET_SE515. Please note: u It is very important to make a note of the key you enter. You will need this information to configure the wireless network adapters properly.
u Once you have completed Security Setup, you have to change the WEP encryp-
tion on the wireless network adapters of the connected PCs as well, otherwise they will no longer have access to the router's wireless network

WPA encryption

WPA was designed to improve the security provided by the WEP mechanism. WPA increases the security of your wireless network by means of a stronger and more complex encryption method, e.g. TKIP (Temporal Key Integration Protocol). Using TKIP the access code is generated by a combination of the MAC address and a key to be defined freely. Additionally, WPA supports the use of an authentication server. Please note: Any PC (network adapter) wanting to gain access to a wireless network protected by WPA must support WPA too. To use WPA, these PCs need additional software installed. The system must be equipped with the Windows XP operating system. You can update your operating system for WPA support by installing an update to be found on the Microsoft web site. For configuration you can use the Windows default configuration tool "Wireless Network Connections". For further information please visit the Microsoft web site. WPA with pre-shared key (WPA-PSK) WPA-PSK is a special mode of WPA for home and small office users without an enterprise authentication server and provides strong encryption protection. Encryption keys are automatically created using the pre-shared key and are automatically changed (called rekeying) and authenticated between devices after a specified period of time (rekey interval). To activate your routers WPA encryption:

Choose WPA-PSK.

Choose whether you want to use an ASCII value of 8-63 characters (any characters)
or a hexadecimal value of exactly 64 characters (0-9, A-F) for the pre-shared key.
Enter a key in the WPA Pre-shared Key box matching your selection. In the box WPA Group Rekey Interval enter the rekey interval. This is the time interval after which the key is changed periodically.
From the Data Encryption menu choose the protocol used for encryption. To go to the next step in the Security Setup, click on NEXT.
WPA with authorisation server For large networks (e. g. in companies) WPA enables the use of an additional authentication service. In this case user access is controlled via user accounts and passwords additionally to the WPA encryption. A Radius server is used as the authentication server. To activate WPA with authentication server:

Choose WPA.

In the box WPA Group Rekey Interval, enter the rekey interval. This is the time
interval after which the key is changed periodically.
In the RADIUS Server IP Address box, enter the IP address of the Radius server. In the RADIUS UDP Port box, enter the port number used for the Radius service

(default is 1812).

In the RADIUS Shared Secret box, enter a keyword according to the Radius servers
conventions to be used by the server for authentication.
802.1x The IEEE 802.1x standard allows WLAN users to connect securely and simply to wired and wireless networks. This is done by setting up authentication data to be used for access to an authentication server. WEP encryption can be set up in addition to the 802.1x authentication here. To activate 802.1x:

Choose 802.1x.

WEP encryption can be set up as described on page 64. To go to the next step in the Security Setup, click on NEXT.
Allowing selected PCs access your local area network
In this next step you can specify up to 32 PCs that are allowed to access your LAN. All other computers will be denied access. Access control is based on the MAC address of the specified PCs.
The access control is disabled by default. This means that all PCs that use the correct SSID can log in. If you wish to keep this setting, click on NEXT.
To activate access control, enable MAC access control list.
The access control list that was last defined is displayed and enabled. Now only these PCs can log in to your router. If you are using this function for the first time, you will have to define the access control list. Please note:
u When you activate the MAC access control you should at least enter the PC from
which you configure the router, otherwise you will no longer be able to access the router's user interface and will see an error message to this effect. options:

You can enter a name for your router here. This name will be used if you want to do Roaming with your router. If you do not need Roaming, leave the default name as it is.

u BSSID

The router's BSSID is displayed here. This is for information only it cannot be changed.

u SSID

Before the wireless network components can communicate with each other, you must use the same SSID (Service Set Identifier). The Gigaset SE515 dsl comes supplied with the SSID configured as Gigaset SE515. You should change this SSID for security reasons. Enter a character string of your choice. The SSID is case-sensitive. It can be up to 32 alphanumerical characters long. Please note: Remember that the connection to the wireless network adapters will be interrupted until you enter the new SSID on them as well. For additional information see "Setting the SSID and making it invisible" on page 63.

u SSID Visibility

If this option is enabled, the Gigaset SE515 dsl will send the SSID in all data transmissions, and your router's SSID will be displayed on PCs that have a wireless network adapter. In this case eavesdroppers could use the SSID to gain access to your network. Your router's SSID will not be displayed if you disable the SSID option. This will increase protection against unauthorised access to your wireless network. Make a note of the SSID however - you will need it to log your PC onto your router.

u Channel

Channel used by the Gigaset SE515 dsl to communicate with other wireless network components. You must use a common channel so that the wireless network components can communicate with one another. Please note: The available channel settings are governed by your country's regulations. They define the number of available channels.

u Transmission Mode

The transmission mode indicates whether the wireless transmission complies with IEEE Standard 802.11b or IEEE 802.11g, or whether both transmission modes are possible (Mixed mode). The main difference between the two standards is the Transmission rate: IEEE 802.11b maximum 11 Mbps, IEEE 802.11g maximum 54 Mbps. If the units use different standards in the wireless network, then you should leave the default Mixed mode.

Click on APPLY to apply the setting.

Dynamic routing

The Route Information Protocol (RIP) is able to dynamically find the optimum route for the transmission of data packets. You can activate the RIP on your router. To activate dynamic routing for a specific interface on your router:
In the IP Routing menu, select Dynamic Routing.
Select the Enabled check box to activate RIP for the interface shown in the Interface

column.

You can select the RIP version and the operating mode (active or passive). Click on APPLY to apply the setting.

DNS server

Normally your Internet Service Provider provides you with a DNS Server which handles the assignment of IP addresses to computer or Domain names each time an Internet connection is established. If required you can manually define the DNS Server to be used for your Internet connections.
Select the menu DNS Server.
The Enable Automatic Assigned DNS check box is activated by default. The router will accept the first DNS assignment received during connection setup.
To select the DNS server manually, disable the Enable Automatic Assigned DNS
check box and enter the IP addresses of your preferred DNS servers (primary and secondary).
Please note: If you change back from manual to automatic assignment you will have to reboot the router.
Setting up the NAT function
The Gigaset SE515 dsl comes supplied with the NAT function (Network Address Translation). The NAT function acts as a firewall against unauthorised access from the Internet. You can use the router's NAT settings to
u set up the router as a virtual server by configuring port forwarding (see below), u open the NAT firewall for specific PCs (see page 86), u activate the dynamic DNS (see page 88).
Setting up Port Forwarding
If you want to offer files or Web services that are on a PC in your local area network to other Internet users, you have to set the PC up as a server (e. g. as on FTP or HTTP server). However the router's NAT function does not normally allow "external" access to PCs on the local area network. To make services available on the Internet from local PCs, you have to set up the router as a virtual server.
Externally the router takes on the role of the server. It receives the requests of remote users under its public IP address and automatically redirects them to the local PCs. The private IP addresses of the servers on the local area network remain protected. Internet services are addressed via defined port numbers. The router needs a mapping table of the port numbers to redirect the service requests to the server that actually makes the service available. For that purpose port forwarding has to be configured.

Opening the firewall for selected PCs (DMZ)
PCs inside the LAN cannot be accessed from the Internet by default. The router protects the LAN by its Firewall. Some applications do not work properly behind a firewall because they require unrestricted data flow in both directions. In this case you can define a so-called demilitarised zone (DMZ) for a PC running such applications. When you create a DMZ, all requests for a service that come from the Internet will be forwarded to that PC unless the service has already been forwarded to another PC by Port Forwarding (see page 84). Please note: Please bear in mind that the demilitarised PC is no longer protected against unauthorised access from the Internet and as such could be a security risk for your network. You should use this option only in emergency situations.
To create a DMZ for a PC, in the NAT menu select DMZ.
Select the connection the DMZ definition should be assigned to in the PVC Name

field.

Enter the name of the service provided by the PC in the Service Name field.
Now you have to choose the PC. You can do it in two different ways.
Click Add to the list. A new entry for the PC will be displayed in the list. Click APPLY if you want to apply these settings for the router configuration.

Activating dynamic DNS

A service which you wish to provide on the Internet can be accessed by a Domain name. Your router's Public IP address is assigned to this Domain name. If your Internet Service Provider assigns the IP address for your local area network's WAN connection dynamically, then the IP address of the router may change. The assignment to the Domain name will no longer be valid and your service will no longer be available. In this case you must ensure that the assignment of the IP address to the Domain name is regularly updated. This is handled by the dynamic DNS Service (DynDNS). You can use the DynDNS service to assign your Gigaset Router an individual static Domain name on the Internet even if it does not have a static IP address. There are various providers on the Internet offering free DynDNS Service. The Gigaset SE515 dsl uses the DynDNS Service from DynDNS.org (http://www.DynDNS.org). If you use the service of this DynDNS provider, then your service can be reached on the Internet as a subdomain of one of the DynDNS.org domains. If you have activated the router's DynDNS function, it will monitor its public IP address. When this changes, it will open a connection to DynDNS.org and update its IP address there. Please note: You have to open an account with DynDNS.org before you can use the router's DynDNS function. Follow the instructions on the DynDNS.org website. Then enter the account user data when configuring the router.

u The above provisions does not imply a change in the burden of proof to the detri-

ment of the customer.

u To invoke this Guarantee, please contact the Siemens helpdesk on 277.
This number is also to be found in the accompanying user guide.

Glossary

Access point An Access Point, such as the Gigaset SE515 dsl, is the centre of a wireless local area network (WLAN). It handles the connection of the wireless linked network components and regulates the data traffic in the wireless network. The Access Point also serves as an interface to other networks, e.g. an existing Ethernet LAN or via a modem to the Internet. The operating mode of wireless networks with an Access Point is called Infrastructure mode. Ad-hoc mode Ad-hoc mode describes wireless local area networks (WLANs) in which the network components set up a spontaneous network without an Access point, e. g. several Notebooks in a conference. All the network components are peers. They must have a wireless Network adapter. ADSL Aymmetric digital subscriber line (ADSL) is a special form of the DSL data transmission technique. Auto Connect Auto Connect means that applications such as Web browser, Messenger and Email automatically open an Internet connection when they are launched. This can lead to high charges if you are not using Flat rate. This function can be deactivated at the Gigaset SE515 dsl to save call charges. Bridge A Bridge connects several network segments to form a joint network, e. g. to make a TCP/IP network. The segments can have different physical characteristics, e. g. different connections such as Ethernet and wireless LANs. Linking individual segments via Bridges allows local area networks of practically unlimited size. See also: Switch, Hub, Router, Gateway Broadcast A Broadcast is a data packet not directed to a particular recipient but to all the network components on the network. The Gigaset SE515 dsl does not pass broadcast packets on; they always remain within the local area network (LAN) it administers. BSSID Basic Service Set ID BSSID permits unique differentiation of one wireless network (WLAN) from another. In Infrastructure mode the BSSID is the MAC address of the Access point. In wireless networks in Ad-hoc mode the BSSID is the MAC address of any one of the participants.
Client A Client is an application that requests a service from a Server. For example, an http Client on a PC in a local area network requests data, i.e. Web pages from an HTTP Server on the Internet. Frequently the network component (e. g. the PC) on which the Client application is running is also called a Client. DHCP Dynamic Host Configuration Protocol DHCP handles the automatic assignment of IP addresses to network components. It was developed because in large networks especially the Internet the defining of IP addresses is very complex as participants frequently move, drop out or new ones join. A DHCP Server automatically assigns the connected network components (DHCP Clients) Dynamic IP addresses from a defined IP Pool Range thus saving a great deal of configuration work. It also allows address pools to be used more effectively: Since not all participants are on the network at the same time, the same IP address can be assigned to different network components in succession as and when required. The Gigaset SE515 dsl includes a DHCP Server and so it can automatically assign IP addresses for the PCs on its local area network. For specific PCs you can specify that their IP addresses are never changed. DHCP Server See DHCP DMZ Demilitarised Zone DMZ describes a part of a network that is outside the Firewall. A DMZ is set up, as it were, between a network you want to protect (e.g. a LAN) and a non-secure network (e.g. the Internet). A DMZ is useful if you want to offer Server services on the Internet which for security reasons are not to be run from behind the firewall or if Internet applications do not work properly behind a firewall. A DMZ permits unrestricted access from the Internet to only one or a few network components, while the other network components remain secure behind the firewall. DNS Domain Name System DNS permits the assignment of IP addresses to computer or Domain names that are easier to remember. A DNS Server has to administer this information for each LAN with an Internet connection. As soon as a page on the Internet is called up, the browser obtains the corresponding IP address from the DNS Server so that it can establish the connection. On the Internet the assignment of domain names to IP addresses follows a hierarchical system. A local PC only knows the address of the local Name Server. This in turn knows all the addresses of the computers in the local area network and the next higher Name Server, which again knows addresses in its network and that of the next Name Server. DNS Server See DNS

Domain name The Domain name is the reference to one or more Web Servers on the Internet. The Domain name is mapped via the DNS service to the corresponding IP address. DoS attack Denial of Service A DoS attack is a particular form of hacker attack directed at computers and networks with a connection to the Internet. The aim is not so much to steal data but to paralyse the computer or network to such an extent that the network resources are no longer available. A typical hacker attack involves making a remote computer announce that it is acting for the paralysed machine for example and receive the data meant for you. DSL Digital Subscriber Line DSL is a data transmission technique in which a connection to the Internet can be run at 1.5 Mbps over normal telephone lines. A DSL connection is provided by an Internet Service Provider. It requires a DSL modem. Dynamic IP address A dynamic IP address is assigned to a network component automatically by the DHCP. This means that the IP address of a network component can change with every login or at certain intervals. See also: Static (fixed) IP address DynDNS Dynamic DNS Domain Name Service (DNS) is used to assign Domain names and IP addresses. For Dynamic IP addresses this service is now enhanced with so-called Dynamic DNS (DynDNS). This permits the use of a PC with a changing IP address as a Server on the Internet. DynDNS ensures that a service can always be addressed on the Internet under the same Domain name regardless of the current IP address. Encryption Encryption protects confidential information against unauthorised access. With an encryption system data packets can be sent securely over a network. The Gigaset SE515 dsl uses WEP encryption for secure data transmission over wireless networks. Ethernet Ethernet is a network technology for local area networks (LANs) and has been defined by the IEEE as Standard IEEE 802.3. Ethernet uses a base band cable with a transmission rate of 10 or 100 Mbps. Firewall Firewalls are used by network operators as protection against unauthorised external access. This involves a whole bundle of hardware and software actions and technologies that monitor and control the data flow between the private network to be protected and an unprotected network such as the Internet. See also: NAT
Flat rate Flat rate is a particular billing system for Internet connections The Internet Service Provider charges a monthly fee regardless of the duration and number of logins. Full duplex Data transmission mode in which data can be sent and received at the same time. See also: Half duplex Gateway A Gateway is a device for connecting networks with completely different architectures (addressing, protocols, application interfaces etc.). Although it is not totally correct, the term is also used as a synonym for Router. Global IP address See Public IP address Half duplex Operating mode for data transfer. Only one party can receive or send data at a time. See also: Full duplex http proxy An http proxy is a Server that network components use for their Internet connections. All requests are sent via the proxy. Hub A Hub connects several network components in a star-topology network by sending all the data it receives from one network component to all the other network components. See also Switch, Bridge, Router, Gateway IEEE Institute of Electrical and Electronic Engineers The IEEE is an international body for defining network standards, especially for standardising LAN technologies, transmission protocols and speeds, and wiring. IEEE 802.11 IEEE 802.11 is a standard for wireless LANs in the 2.4 GHz band. In so-called Infrastructure mode terminals can be connected to a base station (Access point) or they can connect with each other spontaneously (Ad-hoc mode). IGMP Internet Group Management Protocol IGMP is an Internet Protocol that provides a way for an Internet computer to report its multicast group membership to adjacent routers. Multicasting allows one computer on the Internet to send content to multiple other computers that have identified themselves as interested in receiving the originating computers content. Multicasting can be used, for example, for multimedia programs streaming media to an audience that has tuned in by setting up a multicast group membership.

SNMP Simple Network Management Potocol The SNMP Protocol is part of the TCP/IP protocol family. It provides a simple network management mechanism based on a common information base for management data and network management messages (called traps) indicating the occurrence of an event in the monitored network (e.g., an alarm message or the notification of a configuration change). SSID Service Set Identifier The SSID is used to identify the stations in a wireless network (WLAN). All wireless network components with the same SSID form a common network. The SSID can be assigned by the network operator. Static (fixed) IP address A static (or fixed) IP address is assigned to a network component manually during network configuration. Unlike a Dynamic IP address, a static (fixed) IP address never changes. Subnet A subnet divides a network into smaller units. Subnet mask The subnet mask determines how many parts of the IP addresses of a network represent the network number and how many the computer number. The subnet mask administered by the Gigaset SE515 dsl is always 255.255.255.0. That means the first three parts of the IP address form the network number and the final part is used for assigning computer numbers. The first three parts of the IP address of all network components are in this case always the same. Switch A Switch, like a Hub, is an element used to link different network segments or components. Unlike a hub however, the switch has its own intelligence that enables it to forward packets to only that subnet or network component they are meant for. See also: Bridge, Hub, Router, Gateway TCP Transmission Control Protocol The TCP Protocol is part of the TCP/IP protocol family. TCP handles data transport between communication partners (applications). TCP is a session-based transmission protocol, i.e. it sets up, monitors and terminates a connection for transporting data. See also: UDP TCP/IP Protocol family on which the Internet is based. IP forms the foundation for each computer-to-computer connection. TCP provides applications with a reliable transmission link in the form of a continuous data stream. TCP/IP is the basis on which services such as WWW, Mail and News are built. There are other protocols as well.