ELSA Lancom DSL/10 Office User manual

MELSA LANCOM TM DSL/10 Office
20554
/
0200

© 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 from ELSA. We reserve the right to make any
alterations that arise as the result of technical 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.
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 trademarks of their respective owners.
Subject to change without notice. No liability for technical errors or omissions.
ELSA AG
Sonnenweg 11
52070 Aachen
Germany
www.elsa.com
Aachen, February 2000

Preface
Thank you for placing your trust in this ELSA product.
By selecting the ELSA LANCOM DSL/10 Office you have chosen a router which you can
use to connect local area networks or single workstations to the Internet via an xDSL
connection. You can now surf the Internet 12 times faster than over a single B channel
in the ISDN network.
The highest quality standards in manufacturing and stringent quality control are the basis
for high product standards and consistent quality of ELSA products.
Documentation
The accompanying documentation comprises:
K
Manual
Hardware installation, description of functions and operating modes and examples
of configurations
K
CD containing electronic documentation
Basic technical information (e.g. on xDSL, general network technology, TCP/IP),
workshop with comprehensive usage examples, reference section with complete
menu description
Our online services (Internet server 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. Current drivers, 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.

Contents
ELSA LANCOM DSL/10 Office
V
Contents
Introduction .................................................................................................................. 1
What does a router do? ........................................................................................ 1
What does the ELSA LANCOM DSL/10 Office offer? .......................................... 2
Installation ...................................................................................................................5
Package contents.................................................................................................. 5
Introducing the ELSA LANCOM DSL/10 Office .................................................... 5
How to connect the router.................................................................................... 7
Software installation ............................................................................................ 8
Basic configuration............................................................................................... 8
Make basic settings with ELSA LANconfig ................................................ 8
Configuring the basic settings using telnet.............................................. 10
Configuration modes ................................................................................................ 11
Many paths lead to the ELSA LANCOM DSL/10 Office ..................................... 11
The user-friendly method: inband....................................................................... 11
Preconditions............................................................................................. 11
Alternatively: Address administration with the DHCP server .................. 12
Beginning configuration using ELSA LANconfig....................................... 12
Start up inband configuration using telnet............................................... 13
Configuration commands ................................................................................... 13
New firmware with FirmSafe ............................................................................. 14
This is how FirmSafe works...................................................................... 14
How to load new software ....................................................................... 15
Configuration using SNMP ................................................................................. 17
General...................................................................................................... 17
Accessing tables and parameters using SNMP ....................................... 18
The Management Information Base (MIB) ............................................... 20
Operating modes and functions ............................................................................. 21
Security for your configuration ........................................................................... 21
Password protection ................................................................................. 21
Login barring ............................................................................................. 22
Access control via TCP/IP ......................................................................... 22
Security for your LAN.......................................................................................... 22
The hiding place—IP masquerading (NAT/PAT) ...................................... 23
TCP/IP packet filters.................................................................................. 23
Call charge management.................................................................................... 23
Time-dependent connection control ......................................................... 23
Settings in the charge module.................................................................. 24
xDSL connections................................................................................................ 24

Contents
ELSA LANCOM DSL/10 Office
VI
Name-list................................................................................................... 26
PPP-list ...................................................................................................... 27
IP routing............................................................................................................. 27
The IP routing table................................................................................... 27
Local routing.............................................................................................. 29
Dynamic routing with IP RIP...................................................................... 29
IP masquerading (NAT, PAT)..................................................................... 31
DNS forwarding ........................................................................................ 32
Policy Based Routing................................................................................. 32
Automatic address administration with DHCP................................................... 33
The DHCP server ....................................................................................... 33
DHCP—'on', 'off' or 'auto'?....................................................................... 33
How are the addresses assigned?............................................................ 34
DNS..................................................................................................................... 36
What does a DNS server do?.................................................................... 36
Setting up the DNS server ........................................................................ 37
Appendix ..................................................................................................................... 41
Technical data..................................................................................................... 41
Declaration of conformity ................................................................................... 42
Warranty conditions ........................................................................................... 43
Index ............................................................................................................................ 45
Description of the menu options (on CD only) .....................................................R1
Status.................................................................................................................. R3
Status/Connection-state........................................................................... R4
Status/Current-time.................................................................................. R4
Status/Operating-time.............................................................................. R4
Status/WAN-statistics.............................................................................. R4
Status/LAN-statistics................................................................................ R6
Status/PPP-statistics................................................................................. R8
Status/TCP-IP-statistics .......................................................................... R13
Status/IP-router-statistics....................................................................... R18
Status/Config-statistics .......................................................................... R20
Status/DSL-statistics.............................................................................. R20
Status/DSL-statistics/PPPoE-statistics................................................... R21
Status/Queue-statistics .......................................................................... R22
Status/Connection-statistics .................................................................. R23
Status/Info-connection ........................................................................... R23
Status/Remote-statistics ........................................................................ R23
Status/Channel-statistics ....................................................................... R24
Status/Time-statistics............................................................................. R25
Status/Delete-values.............................................................................. R25

Contents
ELSA LANCOM DSL/10 Office
VII
Setup................................................................................................................. R25
Setup/WAN-module ............................................................................... R26
Setup/Charges-module........................................................................... R29
Setup/LAN-module ................................................................................. R30
Setup/TCP-IP module.............................................................................. R31
Setup/IP-router-module .......................................................................... R34
Setup/SNMP-module.............................................................................. R42
Setup/DHCP-server-module.................................................................... R43
Setup/DNS module................................................................................. R45
Setup/Config-module.............................................................................. R46
Setup/Time-module ................................................................................ R47
Firmware ........................................................................................................... R47
Other ................................................................................................................. R49

Contents
ELSA LANCOM DSL/10 Office
VIII

Introduction
ELSA LANCOM DSL/10 Office
1
Introduction
The sheer speed of development of computer technology over the last few years has
resulted in a huge increase in the volume of electronic data traffic. More users every day
want to send and receive a constantly increasing volume of data. Conventional
transmission technologies (modem or ISDN devices) are no longer equal to the demand.
New technologies are eliminating the restrictions and are offering the user true
broadband communications at significantly higher transfer speeds. An important
criterion for the spread of these new access technologies is their availability in as many
offices and companies as possible. One new technology is transmission by xDSL, which
covers the “last mile”over conventional copper wires.
The ELSA LANCOM DSL/10 Office gives you a router that has been specially developed
for xDSL terminals.
ELSA LANCOM DSL/10 Office can connect individual workstations or entire local
networks to the Internet. It makes it possible for you to download data from the Internet
at previously unknown speeds (768 Kbps).
This section is a brief introduction to the device and its functions. See the following
sections for a detailed description of the functions, the software and how to use it and
an introduction to the technical basics.
What does a router do?
A router connects local networks (LANs) and individual PCs to form a Wide Area Network
(WAN). This allows any computer in this WAN to access the computers and services on
the entire network, depending on its access privileges. The router does this by seeking
out a path over which data can be exchanged between the computers.
This is available in the form of an xDSL connection, for example, that can be realized via
normal copper telephone lines.
Connection to the Internet is a particularly widespread form of network connection. If
the local network in a company is connected with the network of an Internet service
provider, all computers in the LAN will be able to access the services and sites on the
World Wide Web.
The router is incorporated into the network in the same way as any normal PC. Any data
traveling on the network cable, therefore, is seen by the router too. It automatically
determines whether or not the data needs to be transmitted to another network. If
necessary, it establishes the connection to the destination network.

Introduction
ELSA LANCOM DSL/10 Office
2
When precisely should the router be used?
As a matter of fact, wherever computers need to be joined together and a simple modem
operation no longer fits the bill. An example is the use of the Internet in the LAN.
Many companies are experiencing an increasing demand for Internet access from all
workstations on the LAN. Online research, file transfer and e-mail are just some of the
applications intended to lighten the workload of those working at a PC.
The router links all the workstation computers on your local area network to the global
Internet. Security features such as IP masquerading not only save you money but also
shield your network against access from outside.
What does the ELSA LANCOM DSL/10 Office offer?
The following is an outline of the principal features of the device giving you a quick
overview of its capabilities.
Easy installation
K Connect the ELSA LANCOM DSL/10 Office to the power supply.
K
Establish a link to the LAN.
K
Connect to the xDSL terminal.
K
Switch it on.
K Go!
LAN connection
DSL router from ELSA can be connected to a (Fast) Ethernet network using the 10/
100Base-T port. The connection automatically determines the speed at which the local
network is running.
WAN connection
The ELSA LANCOM DSL/10 Office can be connected to the Ethernet interface of an xDSL
connection.
Status displays
LED indicators on the front of your device allow you to monitor the xDSL and Ethernet
connection, thus simplifying the process of diagnosing any systems failures.

Introduction
ELSA LANCOM DSL/10 Office
3
Configuration with ELSA LANconfig
Setting up and configuring the device to your specific needs is made quick and easy in
the Windows operating systems by the configuration tool supplied, ELSA LANconfig.
Users of other operating systems can use any telnet or terminal program.
The integrated installation wizards help you to setup the devices in just a few steps.
Software update
Your devices have a flash ROM memory to ensure that its software remains state of the
art. This allows new firmware to be loaded onto the device without the need to open it
up.
FirmSafe
There is no risk involved with loading the new firmware: The FirmSafe function 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.
DHCP
Thus you can define a certain range of IP addresses which the DHCP server then
independently assigns to the individual devices on the local network.
When in automatic mode, the router can also define all addresses on the network and
assign them to the devices connected to the network.
Charge monitoring
The charges for Internet usage are calculated by the provider depending on the time
used. To prevent unpleasant surprises from unexpectedly high telephone bills at the end
of the month, you can preset the number of online minutes allowed for a specified period
(e.g. 10 hours in 6 days) while using a ELSA LANCOM DSL/10 Office.
Access protection
The router offers protection against unauthorized access to the company network not
only with simple password protection but also a complete security concept with firewall
filters and IP masquerading. 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.

Introduction
ELSA LANCOM DSL/10 Office
4
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 on queries
for known computer names.
The DNS server can also access the name and IP information from the DHCP server.
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.

Installation
ELSA LANCOM DSL/10 Office
5
Installation
This section will help you connect to the Internet as quickly as possible. You will first
find out what your product includes and get to know it. Then we will show you how to
connect the device and get it working.
The following information is intended for experienced users familiar with hardware and
network configuration.
Package contents
Please check the package contents for completeness before starting the installation. The
following components should be in the box:
K Power supply unit
K LAN connection cable
K xDSL connection cable
K Configuration interface cable
K Configuration cable adapter
K Documentation
K CD containing ELSA LANconfig, other software and electronic documentation
Please contact your dealer directly if anything is missing.
Introducing the ELSA LANCOM DSL/10 Office
This section introduces the unit's hardware. It covers the unit's display elements and
connection options.

Installation
ELSA LANCOM DSL/10 Office
6
You will find a number of LEDs as display elements on the front panel.
Power/Msg This LED flashes once when the power supply is switched on. After the self-test, either
an error is output by a flashing light code or the device starts and the LED remains lit.
DSL-Rx/Tx This yellow LED shows that data is moving on the DSL connection.
DSL-Link This green LED shows that the Ethernet connection between ELSA LANCOM DSL/10
Office and the DSL terminal is operating properly.
DSL-Chan This LED shows the status of the DSL connection to the switching center:
The connection is active and incurring charges so long as the 'DSL-Chan' LED is green!
LAN-tx, -rx,
LAN-Coll, -Link
LAN-FDpx, -Fast
These LEDs show the corresponding network controller status:
Off Device off
red 1 x short Boot procedure (test and load) started
red flashing Display of a boot error (flashing light code)
red Device ready for use
Off ELSA LANCOM DSL/10 Office has not requested a login at the switching center
red ELSA LANCOM DSL/10 Office has requested a login at the switching center; it is logging in
green It has successfully logged in and is connected to the provider
LAN-rx/tx yellow Data packet sent from the device to the LAN or vice versa
LAN coll red Sending collision
LAN-Link green Connection to LAN is established and ready
LAN-FDpx green Router is transmitting and receiving data simultaneously
LAN-Fast green ELSA LANCOM DSL/10 Office is operating at 100 Mbit

Installation
ELSA LANCOM DSL/10 Office
7
Now turn the whole thing around and take a look at the rear. Beginning again on the
left-hand side, you have:
 On/Off switch
Connection for power supply unit
! 10/100Base-Tx for 10 Mbit or 100 Mbit networks
" Node/hub selector switch
# V.24 configuration interface
$ 10Base-T terminal for xDSL or cable modem
How to connect the router
= Connect the router ELSA LANCOM DSL/10 Office to the LAN. Plug the network
cable (supplied) into the 10/100Base-T network terminal of the device and into a
free network connector on your local network (or into a free socket on a hub in your
LAN).
> Connect the device to the Ethernet port of the xDSL (e.g. NTBBA from Deutsche
Telekom) or cable modem.
? Give your device the power it needs through the power supply unit! After a short
device self-test the 'Power/Msg' LED will be permanently lit. The 'LAN Link' LED
indicates that your router is correctly connected to the LAN.
If this LED does not come on, reverse the node/hub selector switch. If the LED still does
not light, there may be a problem with the network card or the wiring.
쐃쐇 쐋 쐄 쐂쐏

Installation
ELSA LANCOM DSL/10 Office
8
Software installation
The ELSA LANconfig configuration software for Windows operating systems enable you
to set up your router easily and conveniently for the desired application.
You will need a PC on the LAN to run the configuration software.
 Install the TCP/IP network protocol on the computer that will be used to set up the
access point.
 Then install ELSA LANconfig. If the setup program does not start up automatically
after insertion of the ELSA LANCOM CD, start Windows Explorer, click on
'autorun.exe' on the CD ELSA LANCOM and follow the instructions in the install
program.
Basic configuration
The IP address for the access point is set during the basic configuration. In addition, the
decision on whether to use the integrated DHCP server is made. You can run the basic
configuration with ELSA LANconfig or with telnet.
Make basic settings with ELSA LANconfig
The first time ELSA LANconfig is run, the new access point is detected on the TCP/
IP network and can immediately be configured. A wizard is automatically started to help
you with the basic settings of the device or it can even the complete setup itself.
 Start the new software with Start - Programs - ELSAlan - ELSA LANconfig.

Installation
ELSA LANCOM DSL/10 Office
9
 Select the option 'make all settings automatically' if you are not familiar with
networks and IP addresses and one of the following conditions applies:
–You have not used any IP addresses previously in your network but would now
like to do so. You do not care which IP address should be used. The router as a
DHCP-server will automatically set and assign the IP addresses for all devices in
the network (LAN and WLAN).
or
–You do not wish to use IP addresses, perhaps because you have a Windows-only
network.
If you do not know whether IP addresses have been used in your network, first click on
Start
- Run, enter the following command in the window winipcfg and click OK. If
the next window shows the value '0.0.0.0' in the field 'IP address', the computer has
never had an IP address.
In Windows NT you can check IP addresses with the command ipconfig.
 Select the option 'I want to make the settings myself' if you are familiar with
networks and IP addresses and one of the following conditions applies:
–You have not used any IP addresses previously in your network but would now
like to do so. However, you wish to set the IP address for the router and assign
it an address from an address range reserved for private use, e.g. '10.0.0.1' with
the network mask '255.255.255.0'. At the same time you will set the address
range that the DHCP server uses for the other devices in the network (so long as
the DHCP server is not switched off).
–You have previously used IP addresses on the computers in the LAN. Assign the
router a free address from the previously used address range, and select whether
the router should run as a DHCP server or not.
You can find more information on the general structure of networks and setting IP
addresses in the electronic documentation on the ELSA LANCOM CD. The functions of
the DHCP server are described later in this manual.
 The Internet access wizard starts automatically on completion of the basic settings
wizard. Enter only the user name and the password supplied by your provider.
 After these few mouse clicks your router is fully set up for access to the Internet.

Installation
ELSA LANCOM DSL/10 Office
10
Configuring the basic settings using telnet
If you do not wish to or cannot use ELSA LANconfig (e.g. because you have installed a
different operating system), you can also make the basic settings over a telnet
connection.
Start the telnet connection to the address '10.0.0.254' if you have not previously used IP
addresses in your network, or to address 'x.x.x.254', where 'x.x.x' stands for the address
group previously used in the network.
Enter the following command:
 You can start the telnet connection with the command Start - Run and entering
the command telnet 10.0.0.254 in the window.
 Change the language for the configuration with the command:
set /Setup/config-module/language english
 Intranet address and network mask:
set /setup/TCP-IP-module/ Intranet adr. 10.0.0.1
set /setup/TCP-IP-module/ Intranet mask 255.255.255.0
After changing the Intranet address, the telnet connection is terminated by the router and
you will need to establish a new telnet connection to the set Intranet address.
 To switch off the DHCP function:
set setup/DHCP-module/operating off
 Set up provider in the name list:
set /Setup/WAN module/name list internet 20
 Input access data into the PPP list:
set /Setup/WAN module/PPP list Internet no 'your password'
0 5 'your user name'
 Set route into Internet:
set /Setup/IP-router-module/IP-routing-tab 255.255.255.255
0.0.0.0 internet 0 ON
Even if the entries at this point are not very clear without further explanation, you can
reach the same destination as with the setup with ELSA LANconfig: This establishes
access to the Internet for the first time!

Configuration modes
ELSA LANCOM DSL/10 Office
11
Configuration modes
It will nevertheless be necessary for you to add some information and configure the
router to your specific needs. These settings are made as part of the configuration
process.
This section will show you the programs and routes you can use to access the device and
set it up.
And, if the team at ELSA has produced new firmware with new features for your use, we
will show you how to load the new software.
Many paths lead to the ELSA LANCOM DSL/10 Office
In principle, there are different methods of accessing the router of ELSA:
K Through the configuration interface (config interface) on the rear of the router (also
known as outband)
K Through the LAN or WAN network (Inband)
What is the difference between these?
On one hand, the availability of the units: Configuration via outband is always available.
Inband configuration is not possible, however, in the event of a network fault or if an
IP network is not installed.
On the other hand, whether or not you will need additional software or hardware. The
inband configuration requires one of the computers already available in the LAN or WAN,
as well as suitable software. In addition to the software, the outband configuration also
requires one of the computers (with a serial port) and a suitable configuration cable.
The user-friendly method: inband
Using inband configuration allows any computer on the WAN or LAN to access the
router. However, the access can be restricted or completely blocked with the IP access
list. Inband configuration requires the use of either telnet (supplied with most operating
systems) or the ELSA LANconfig configuration program for Windows. ELSA LANconfig
is supplied with your device. You can always obtain up-to-date releases from our online
media.
Preconditions
TCP/IP or TFTP are used to make configurations using telnet or ELSA LANconfig. This
means that the TCP/IP protocol must be installed on the computer being used and the
router must be given an IP address which you will then use when addressing it.

Configuration modes
ELSA LANCOM DSL/10 Office
12
A device that has not been configured yet will respond to the IP address
XXX.XXX.XXX.254, in which the Xs are placeholders for the network address in your LAN.
If the computers on your network have addresses such as 192.110.130.1, then you will
be able to address the device using 192.110.130.254.
If there is already a computer with the address XXX.XXX.XXX.254 on your network you
should assign a new address to the device using the outband configuration method
before you install it on the LAN.
Alternatively: Address administration with the DHCP server
If it is not absolutely essential that you configure the correct IP addresses "manually", the
DHCP server will gladly do this task for you automatically. When using the DHCP server
you can have the IP addresses for all computers on the network assigned automatically
(see also chapter 'Automatic Address Administration with DHCP'). The router can also
set the LAN-side IP address for itself.
Beginning configuration using ELSA LANconfig
Start up ELSA LANconfig from the Windows Start Menu, for instance, by clicking Start
- Programs - ELSAlan - ELSA LANconfig. ELSA LANconfig searches the local area
network for devices. This function can be disabled.
Just click on the Browse button or call up the command with Device
- Find to initiate
a search for a new device manually. ELSA LANconfig will then prompt for a location to
search. You will only need to specify the local area network if using the inband solution,
and then you're off.
Once ELSA LANconfig has finished its search, it displays a list of all the devices it has
found, together with their names and, perhaps a description, the IP address and its
status.