ELSA LANCOM Wireless IL-II User manual

ELSA LANCOMTM Wireless IL-II
100324 Wireless IL-11.book Seite 1 Montag, 30.Oktober 2000 4:13 16

© 2000 ELSA AG, Aachen (Germany)
While the information in this manual has been compiled with great care, it may not be deemed an assurance of product
characteristics. ELSA shall be liable only to the degree specified in the terms of sale and delivery.
The reproduction and distribution of the documentation and software supplied with this product and the use of its contents
is subject to written authorization fromELSA. We reserve the right to make any alterations that arise as the result of tech-
nical development.
ELSA is DIN EN ISO 9001 certified. The accredited TÜV CERT certification authority has confirmed ELSA conformity to the
worldwide ISO 9001 standard in certificate number 09 100 5069, issued on June 15, 1998.
You can find all declarations and approvals for the products, as long as they were available at the time of publication, in
the appendix of this documentation.
Trademarks
Windows®, Windows NT®and Microsoft®are registered trademarks of Microsoft, Corp.
The ELSA logo is a registered trademark of ELSA AG. All other names mentioned may be trademarks or registered trade-
marks of their respective owners
ELSA Subject to change without notice. No liability for technical errors or omissions.
ELSA AG
Sonnenweg 11
52070 Aachen
Germany
www.elsa.com
Aachen, October 2000
100324/1000
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Preface
Thank you for placing your trust in this ELSA product.
Wireless networks from ELSA are economical alternatives or additions to
local wired networks (LANs). Notebooks and PCs can use mobile network
cards to communicate with one another or access wired networks via access
points and can even be integrated into the ISDN network.
Documentation
The accompanying documentation comprises:
Manual
Hardware installation, description of the functions, operating modes and
sample configurations
CD containing electronic documentation
All product manuals, basic technical information (e.g. wireless networks,
general networking technology, TCP/IP etc.), workshop with detailed ex-
amples of applications, reference section for general information includ-
ing a complete description of the menus.
Our online services (www.elsa.com) are available to you around the clock
should you have any queries regarding the topics discussed in this manual or
require any further support. In the Support file section under 'Know-how', you
can find answers to frequently asked questions (FAQs). The KnowledgeBase
also contains a large pool of information. Currentdrivers, firmware, tools and
manuals can be downloaded at any time.
The KnowledgeBase can also be found on the CD. Just open the file
\Misc\Support\MISC\ELSASIDE\index.htm.
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Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.1 The basic functions of a wireless network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3 What does the ELSA LANCOM Wireless IL-11 offer? . . . . . . . . . . . . . . . . . . . . . . . 13
2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.1 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.3 Install TCP/IP on your workstation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.1 Windows 95 and Windows 98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.2 Windows NT 4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.3.3 Windows 2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.4 Introducing the ELSA LANCOM Wireless IL-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.4.1 The front of the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.4.2 The status of the ISDN connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.4.3 The bottom of the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5 How to connect the device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.6 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.7 Quickstart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.7.1 The wizards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.7.2 Basic settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3 Configuration and management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.1 Radio or wired: configuration approaches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.2 Configuration using ELSA LANconfig. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.3 Configuration with ELSA WEBconfig . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.4 Configuration using Telnet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.5 Configuration using a dial-up connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.5.1 This is what you need for remote configuration. . . . . . . . . . . . . . . . . . . . . . . 40
3.5.2 This is how you prepare the remote configuration. . . . . . . . . . . . . . . . . . . . . 40
3.5.3 The first remote connection using a Dial-up Networking and ELSA LANconfig
40
3.5.4 The first remote connection using a PPP client and Telnet . . . . . . . . . . . . . . 41
3.5.5 Limiting remote configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.6 Configuration using SNMP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
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3.7 New firmware with FirmSafe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.7.1 This is how FirmSafe works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.7.2 How to load new software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.8 What's happening on the line? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.9 ELSA LANmonitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.10 DSL firmware for ELSA LANCOM Wireless. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4 Operating modes and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.1 Establishing wireless connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
4.1.1 Considerations for setting up a wireless network . . . . . . . . . . . . . . . . . . . . . 50
4.1.2 Ad hoc network (peer-to-peer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4.1.3 Infrastructure network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.1.4 Point-to-point network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.1.5 Wireless Internet gateway via ISDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.1.6 Wireless Internet gateway via DSL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.2 Security for your configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.2.1 Security for the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.2.2 Security for your WLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
4.2.3 Security for your LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.3 ISDN routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.3.1 ISDN name list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.3.2 Interface settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.3.3 Router interface settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.3.4 Layer list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.3.5 Call charge management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4.4 Automatic address administration with DHCP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4.4.1 The DHCP server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4.4.2 DHCP—'on', 'off' or 'auto'?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.4.3 How are the addresses assigned? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.4.4 Configuring the DHCP server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4.5 The least-cost router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.5.1 Function of the LANCOM Wireless least-cost router. . . . . . . . . . . . . . . . . . . 74
4.5.2 Setting up the least-cost router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
4.6 ELSA CAPI Faxmodem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4.6.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4.6.2 Faxing with the ELSA CAPI Faxmodem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.7 Office communications and LANCAPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.7.1 LANCAPI interface settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.7.2 The ELSA LANCAPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
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4.8 Accounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.8.1 Configuring accounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
4.8.2 Reading the accounting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.1 Power and ratings data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
5.2 Radio frequency channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.1 Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.2 General Warranty conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
7 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
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1 Introduction
The advantages of wireless LANs are obvious: Notebooks and PCs can be set
up where they are wanted—problems with missing ports or construction al-
terations are a thing of the past with wireless networking.
Network links in conferences or presentations, access to resources in adja-
cent buildings and exchanging data with mobile units are only a few of the
options available with a wireless LAN.
The access point plays the central role in enabling these options in an exist-
ing wired network. All stations in the wireless network access the LAN via
the access point.
Your entire LAN is connected to the outside world via the integrated IP router
and the ISDN interface. Access to the Internet for the entire LAN or office
functions such as fax and answering machine at all workstations are only
some of the advantages offered by the ISDN router.
Notes on using wireless LAN devices
ELSA Wireless LAN products can use up to 13 radio frequency channels in a
frequency band between 2400 MHz and 2483 MHz. The devices are approved
for operation in all EU countries and Switzerland. Use of the devices is reg-
ulated throughout Europe by the 1999/5/EG guideline of the European Parlia-
ment and Council Directive of 9 March 1999 regarding Radio and
Telecommunication Terminal Equipment (R&TTE) and the mutual approval of
their conformity. Please observe the approved frequencies for individual
countries as listed in the appendix.
ELSA is not responsible for disturbances or interference caused by unautho-
rized modifications made to the devices. ELSA will not be held liable espe-
cially for the consequences of connecting external antennas or cables that
are not explicitly designed for use with ELSA LANCOM Wireless and Air-
Lancer devices.
See the appendix for more information on CE conformity.
1.1 The basic functions of a wireless network
This chapter introduces the basic functional principles of a wireless network.
The terms used will be explained and the structure and possible applications
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EN
of wireless networks introduced. Detailed information on this and other top-
ics can be found in the electronic documentation on the CD.
Wireless network
adapters WLAN Wireless network adapters connect individual notebooks and PCs to a Local
Area Network (LAN). As the usual network cables have been replaced by a
radio link in this case, we also refer to this as a Wireless Local Area Network
(WLAN).
Access point Furthermore, the access point forms the bridge between LAN and WLAN.
The ELSA access point also can function as an Internet router or a wireless
bridge between two ethernet LANs. It has a slot for a wireless network
adapter (ELSA AirLancer MC-11) as well as a normal Ethernet connection on
the other side to exchange data between the two networks.
Radio cell The maximum area in which wireless network adapters in mobile stations
and the access point can reach each other and exchange data is known as a
radio cell.
All of the standard functions of a wired network are also available in a wire-
less network: Access to files, servers, printers etc. is possible as is the inte-
gration of the mobile stations into an internal company e-mail system.
1.2 Operating modes
The following operating modes are available using ELSA wireless network
adapters and access points:
Ad hoc network (peer-to-peer)
Infrastructure network
Wireless bridge
Wireless LAN + ISDN gateway
Wireless LAN + DSL gateway
Direct PC
connection Use the wireless network cards to link two or more computers directly. All
computers in a WLAN can then communicate with one another with no addi-
tional hardware.
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Ad hoc network This application is generally called a peer-to-peer network. In the language
of wireless networking, it is known as an ad hoc network.
Infrastructure
network All computers with wireless network cards are able to access a wired net-
work via an access point. The access point acts as the connection between
the LAN and the WLAN and it also forms the switching center for data traffic
within the WLANs.
A wireless network with a access point is also referred to asan infrastructure
network.
This network type is ideally suited as an addition to existing LANs. The infra-
structure network is the ideal solution for expansion of a LAN in areas where
wiring is not possible or not economical.
Roaming Multiple access points can be used if the range of a cell is not sufficient to
link all mobile stations. This makes it possible to switch from one wireless
cell to another without interrupting the connection to the network.
Ad hoc network
Infrastructure network
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Radio cells can also overlap to ensure good coverage. Different channels (up
to 13 channels are available) can be selected to prevent interference
between the cells.
WLAN and
ISDN/DSL gateway The ELSA LANCOM Wireless IL-11 access point offers a special supplemen-
tary function. The access point connects both the wireless network and the
ISDN or DSL network simultaneously to the wired network via the ISDN inter-
face.
This enables additional applications such as access to the Internet for all
computers in the LAN and WLAN together with all the functions of an IP
router.
ISDN
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1.3 What does the ELSA LANCOM Wireless IL-11
offer?
The following is an outline of the principal features of the device giving you
a quick overview of its capabilities.
Easy installation
Connect the LANCOM Wireless to the power supply.
Establish a link to the LAN.
Connect to a DSL port.
Plug in the ISDN cable.
Switch it on.
Go!
LAN connection
Access points for wireless networks by function in ELSA Ethernet environ-
ments. Use the 10Base-T connection and a hub or switch to connect the ELSA
LANCOM Wireless IL-11 to a 10 Mbit LAN or to a DSL modem.
WAN connection
The ELSA LANCOM Wireless IL-11 is connected to the S0interface(s) of an
ISDN basic rate interface in point-to-multipoint configuration (multi-device
terminal) or in point-to-point configuration (system terminal). The router au-
tomatically detects your port type and the D-channel protocol being used.
Switched connections using DSS1 or 1TR6 can also be used, as can
leased-line connections.
Operation with an ISDN leased line is not included in the standard delivery
scope of the router. The leased line option can be enabled by entering a code.
DSL connection
With special DSL firmware (on CD-ROM), you can connect your LANCOM to
a DSL modem (such as the T-DSL network offered by Deutsche Telekom).
Instead of connecting to the Ethernet, you can have quick access to the Inter-
net. This procedure can be switched in both directions by using the corre-
sponding firmware.
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Configuration
Setting up and configuring the devices to your specific needs is made quick
and easy in Windows operating systems by the configuration tool supplied,
ELSA LANconfig.
The management tool WEBconfig is just as easy to use. It allows you to
access the configuration of the ELSA LANCOM access point or even load new
firmware using any HTML browser. Furthermore it is possible to access
device configuration via SNMP and TFTP.
For access to the device, the TCP/IP protocol has to be installed on the sta-
tions. The ELSA LANCOM access point can then be configured for a LAN,
WLAN or WAN connection. The unit can be maintained remotely via ISDN—
even before being configured after delivery.
Access to the device is possible from a WAN (via ISDN), WLAN or LAN. TFTP
is supported along with SNMP if configuring from the LAN or WLAN.
The integrated setup wizards from ELSA LANconfig and ELSA WEBconfig
help you get the unit operating in a few steps.
Software update
Your device has a flash ROM memory to ensure that its software remains
state of the art. This allows new firmware to be loaded onto the device with-
out the need to open it up.
The current version is always available to you on our online media and can be
loaded via the LAN, the WLAN or the WAN (ISDN).
FirmSafe
There is no risk involved with loading the new firmware: The FirmSafe func-
tion enables two firmware files to be managed on one device. If the new
firmware version does not function as desired after the upload you can simply
revert to the previous version.
If an error occurs during the upload (e.g. a transmission error) the functioning
previous version is automatically reactivated.
Intruder protection
Along with password protection and call number recognition (CLIP), the router
offers protection against unauthorized access to the company network by
means of a callback function which only permits a connection to be estab-
lished to previously defined ISDN telephone numbers only. Authentication
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mechanisms in PPP, firewall filters and IP masquerading complete the secu-
rity concept. Furthermore, login barring prevents any “brute force attacks”
and denies access to the router after a configurable number of login attempts
using an incorrect password.
Wireless and secure with WEP
The WEP (Wired Equivalent Privacy) encryption method attaches a 40-bit or
128-bit key to the wireless data. The data encryption and authentication of
the stations makes it as good as impossible for the data in transit to be inter-
cepted. This ensures a considerably higher level of data security in wireless
network operation. Additionally, station filters based on MAC addresses
make it possible to allow or deny individual stations access to the access
point.
Charge monitoring
Subscribing to “Advice of charge during connection”on the ISDN network
(AOCD) allows you to set the charge units available for a specified period for
the ISDN connection. This puts you in constant control of your phone bill.
Ifcharge information is not available from your ISDN connection,you can also
limit the active ISDN connect time for a specified period. The router will not
permit the active establishment of connections once this time has elapsed.
Least-cost routing
Even if there is a large selection of telecommunications service providers you
can always use the cheapest ISDN lines using the least-cost router.
Automatic time check
In order to generate sound statistics and to select the correct connection
paths using the least costrouter, the devicealwaysmust have the exact time.
It can read the time from the ISDN network itself. The router's internal time
is always compared to ISDN time either each time a connection is estab-
lished or each time the device is switched on. Of course, the time can also be
set manually.
Channel bundling and compression
The device supports static and dynamic channel bundling via MLPPP and
BACP on the ISDN line. Stac data compression (hi/fn) can be used to achieve
increases in the data transfer rate of up to 400%.
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ELSA LANmonitor
Under Windows operating systems, this tool displays the status of the router
on the screen at all times. The most important information for every device
in the local network is displayed, such as:
Connection status for each transfer channel
Name of the remote site
The connected unit module (router, LANCAPI)
Connection duration and transmission rates
Excerpts of the device statistics (e.g. PPP negotiation data)
Additionally, the software allows you to log and save the messages on the
PC for further processing.
AirLancer Client Manager
The ELSA AirLancer Client Manager is included with the AirLancer cards and
provides software tools for configuring AirLancer adapters and monitoring
and diagnosing wireless networks. The wireless connection of WLAN clients
to the access point is continuously monitored, and the current status is also
displayed. You have a choice of the following:
Set the wireless parameters and user profiles
Monitor and analyze the wireless network (site survey)
Display the available access points
Carry out tests and diagnostics on the card
Monitor the signal strength
Assign the WEP encryption key
Refer to the online help file for detailed information on the ELSA AirLancer
Client Manager.
Status displays
LED indicators on the front of your access point allow you to monitor the ISDN
and Ethernet connections and the current line connections, thus simplifying
the process of diagnosing any systems failures.
Statistics
The comprehensive statistics function lets you keep track of your ELSA LAN-
COM Wireless IL-11. These statistics give you all the information you need
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on the data packets transferred, for example, so that you can optimize the
configuration of your device.
DHCP
Your LANCOM provides the following DHCP modes:
DHCP server, to assign IP addresses
DHCP client, to receive addresses
DHCP relay agent, to forward DHCP requests
With its factory-preset configuration, the device operates using a sophisti-
cated automatic mode, which makes it extremely easy to get the LANCOM
running either on an existing network or a new network.
DNS server
The router's DNS server functions allow you to set up links between IP
addresses and names of computers or networks. The correct route can be
directly assigned in the event of queries for known computer names.
The DNS server can also access the name and IP information from the DHCP
server and the NetBIOS module.
The DNS server can also serve as an effective filter for the users in your local
network. Access to specified domains can be denied to individual computers
or complete networks.
ELSA LANCAPI and ELSA CAPI Faxmodem
Themain advantages of using LANCAPI are economic. The LANCAPI is a spe-
cial type of CAPI 2.0 interface through which various communications pro-
grams (e.g. ELSA-RVS-COM or ELSA-ZOC) via the network can access the
router.
Any workstation which has been integrated into the LAN (Local Area Net-
work) can use LANCAPI to give unlimited access to office communication
functions such as fax and EuroFileTransfer. All functions are made available
throughout the network without the need to add hardware to the worksta-
tions. The office communications software simply needs to be loaded onto
the individual workstations.
A fax device is simulated at the workstation so that faxes can be sent. With
the LANCAPI, the PC forwards the fax via the network to the router which
establishes the connection to the recipient.
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Routing: Line connection and management
The router checks all data on the network to determine whether they have to
be sent to another network or computer. If data transfer is necessary, the
router establishes the connection itself and closes the connection once the
transfer is complete. Any partly used call charge units are used up fully if call
charge information is transmitted during the connection.
To reduce transfer costs, the router offers various filter options depending on
the mode of operation. These filters can be used to exclude data from being
tranmitted to all or part of the network. Data that belongs to specific services
(e.g. printing services) can also be excluded from transfer.
NetBIOS proxy
ELSA routers offer a special feature for the interconnection of Microsoft
peer-to-peer networks. With the integrated routing of IP NetBIOS packets,
the linking of Windows networks becomes child's play. The remote stations
relevant for the exchange ofdata are entered in a list to ensure that not every
NetBIOS packet results in the establishment of a connection.
As a NetBIOS proxy, the router answers the queries for known workstations
locally to prevent unnecessary connections from being established.
Accounting
Most data transfers through the ELSA router take place via dial-up connec-
tions, where the charges are calculated based on the online time, or via static
connections, where the charges are calculated based on the transferred data
volume. Only a small portion of users use true leased-line connections with
flat-rate charging.
For many users it is important to determine which of the immediate LAN com-
puters use the connection to the router and what charges they incur.
With its accounting feature, ELSA LANCOM Wireless IL-11 offers the ability
to breakdown online times and data transfer volumes for ISDN and DSL con-
nections based on the individual computers that use the connections. This
allows you to determine the incorrect configuration of the computer or router
quickly and allocate the resulting expenses to their appropriate causes.
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Roaming
The roaming feature lets you construct bigger wireless networks using any
number of access points. When stations switch from one wireless cell to
another while connected, they are automatically logged off of the previous
access point and logged onto the next.
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100324 Wireless IL-11.book Seite 20 Montag, 30. Oktober 2000 4:13 16
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