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LANCOM 821 ADSL/ISDN –
LANCOM 1621 ADSL/ISDN –
LANCOM 1711 VPN
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© 2005 LANCOM Systems GmbH, Wuerselen (Germany). All rights reserved. While the information in this manual has been compiled with great care, it may not be deemed an assurance of product characteristics. LANCOM Systems shall be liable only to the degree specified in the terms of sale and delivery. The reproduction and distribution of the documentation and software included with this product is subject to written per- mission by LANCOM Systems. We reserve the right to make any alterations that ar
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Preface Preface Thank you for placing your trust in this LANCOM product. With the LANCOM you have chosen a powerful router that possesses inte- grated DSL respectively ADSL and ISDN interfaces by default as well as an integrated 4-port switch. With this router you can simply and comfortably connect individual PCs or whole local networks to the high-speed Internet. Security settings For a carefree use of your device, we recommend to
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Preface Virtual Local Networks (VLAN) Wireless networks (WLAN) LANCAPI Further server services (DHCP, DNS, charge management) Model variants This user manual applies to the following models of the LANCOM series: LANCOM 821 ADSL/ISDN LANCOM 1621 ADSL/ISDN LANCOM 1711 VPN Model The sections of the documentation that refer only to a range of models are restriction marked either in the corresponding text itself or with a
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Preface contact information for LANCOM Systems support can be found on a separate insert, or at the LANCOM Systems website. Notes symbols Very important instructions. If not followed, damage may result. Important instruction that should be followed. Additional instructions which can be helpful, but are not required. 5 EN
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Contents Contents 1 Introduction 9 1.1 How does ADSL work? 9 1.2 Which use does VPN offer? 12 1.3 Firewall 15 1.4 What does a router do? 16 1.4.1 Bridgehead to the WAN 17 1.4.2 Areas of deployment for routers 17 1.5 What can your LANCOM do? 18 2 Installation 21 2.1 Package contents 21 2.2 System preconditions 21 2.3 Introducing LANCOM 22 2.3.1 Status displays 22 2.3.2 The back of the unit 27 2.4 Hardware inst
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Contents 4.2 Instructions for WEBconfig 45 5 Linking two networks 46 5.1 What information is necessary? 47 5.1.1 General information 47 5.1.2 Settings for the TCP/IP router 49 5.1.3 Settings for the IPX router 50 5.1.4 Settings for NetBIOS routing 51 5.2 Instructions for LANconfig 52 5.3 Instructions for WEBconfig 52 6 Providing dial-up access 54 6.1 Which information is required? 54 6.1.1 General information 55 6.
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Contents 8.3 The security checklist 68 9 Troubleshooting 71 9.1 No WAN connection is established 71 9.2 DSL data transfer is slow 71 9.3 Unwanted connections under Windows XP 72 9.4 Cable testing 72 10 Appendix 74 10.1 Performance data and specifications 74 10.2 Contact assignment 76 10.2.1 ADSL interface 76 10.2.2 Ethernet WAN interface (LANCOM 1711 VPN) 77 10.2.3 ISDN-S0 interface 77 10.2.4 Ethernet interfaces
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction 1Introduction The models LANCOM 821 ADSL/ISDN, LANCOM 1621 ADSL/ISDN and LANCOM 1711 VPN are fully-featured routers that therefore also can be used in combination with the integrated firewall for providing secure Internet access to a complete local network (LAN). The VPN option, which is either integrated already or can be activated subs- quently, enables the LANCOM 1621 ADSL/ISDN and LANCOM 1711 VPN to act
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction Ideal for Internet surfers The ADSL version of DSL was designed for applications in which the user receives high volumes of data but only transmits relatively small volumes. A typical example for this would be access to the world wide web (www). Only a few commands (mouse clicks) are required to initiate the download of very large volumes of data such as graphics, texts, audio or video files. The user typica
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction ISDN). Other models like LANCOM 1711 VPN are connected to the splitter using a separate ADSL modem. Telephone Telephone Switching node network Splitter Splitter DSL access Internet multiplexer ADSL Router ADSL provider modem Subscriber The model LANCOM 1711 VPN can also utilize other broadband con- nections (e.g. cable modem) that offer a 10/100Base-Tx-Ethernet connector over PPPoE, PPTP or plain Etherne
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction An 'Annex A' type LANCOM can only be used with ADSL-over-POTS service. Similarly, an 'Annex B' device can only be used with ADSL-over-ISDN service. Retrofitting a device to function with a different telephone system is not pos- sible. ADSL-over-ISDN connections also exist that do not operate in conjunction with ISDN, but which use a conventional analog telephone connection. A prominent example would be Deuts
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction Conventional network infrastructure First, let's have a look at a typical network structure that can be found in this form or similar forms in many companies: LAN Head Office LAN Workstation in remote access, e.g. homework Internet Subsidiary The corporate network is based on the internal network (LAN) in the head- quarters. This LAN is connected to the outside world in three ways: A subsidiary is c
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction to the original investment costs, ongoing costs are also incurred for the administration and maintenance of this equipment. Networking via the Internet The following structure results when using the Internet instead of direct con- nections : LAN Head Office Internet Workstation in remote access Subsidiary All participants have fixed or dial-up connections to the Internet. Expensive dedicated lines are
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction technologies such as DSL (Digital Subscriber Line). But also a conventional ISDN line can be used. The technologies of the individual participants do not have to be compatible to one another, as would be the case for conventional direct connections. A single Internet access can be used to establish multiple simultaneous logical connections to a variety of remote stations. The resulting savings and high flexi
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction Denial-of-Service Protection Attacks from the Internet can be break-in attempts as well as attacks with the aim of blocking the accessibility and functionality of individual services. Therefore a LANCOM DSL is equipped with appropriate protec- tive mechanisms, which recognize well-known hacker attacks and which guarantee the functionality. Quality-of-Service / Traffic management The generic term Quality-
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction Connecting a LAN to the Internet does not technically differ from coupling two LANs. The only difference is that it is not just a handful of computers behind the Internet provider's router. Instead, it is the net of the networks - the public Internet. 1.4.1 Bridgehead to the WAN All routers have at least two connections: at least one for the LAN at least one for WAN connections In addition to LAN conne
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction access to the Internet is required on either side of the network inter- connection. VPN tunnel via the Internet VPN gateways Conventional via ISDN Without VPN, a LAN to LAN interconnection can alternatively be real- ized via ISDN. In this case, an intelligent line management and sophisticated filter mechanisms keeps connection costs low. Remote access to the company network (via VPN or ISDN) The work o
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction LAN to LAN coupling via ISDN RAS server (via VPN) RAS server (via ISDN) IP router IPX router (via ISDN), e.g. for coupling of Novell networks or dialling into Novell networks NetBIOS proxy for coupling of Microsoft peer-to-peer networks via ISDN DHCP and DNS server (for LAN and WAN) N:N mapping for coupling networks using the same IP address ranges from LCOS 5.0 LANCAPI server for the operating with office
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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN Chapter 1: Introduction Firewall filters for a selective locking of IP addresses, protocols and ports MAC address filter control e.g. the access of LAN workstations to IP routing functions Configuration protection to block “brute force attacks“ Configuration Configuration with LANconfig or with web browser, additionally terminal mode for Telnet or other terminal programs, SNMP interface and TFTP server function. Remote configur
