Lancom Systems 821, 1711 Unwanted connections under Windows XP, Cable testing, LAN statistics

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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN

Chapter 9: Troubleshooting

Numerous other factors involving the Internet itself can also influence the transfer rate.

Increasing the TCP/IP window size under Windows

If the actual transfer rate of a DSL connection is significantly below the fastest rate listed by the provider, there are only a few possible causes (apart from the above-mentioned external factors) which may involve one's own equipment.

One common problem occurs when large amounts of data are sent and received simultaneously with a Windows PC using an asynchronous connec- tion. This can cause a severe decrease in download speed. The cause of this problem is what is known as the TCP/IP receive window size of the Windows operating system that is set to a value too small for asynchronous connec- tions.

Instructions on how to increase the Windows size can be found in the Knowl- edge Base of the support section of the LANCOM web site (www.lancom.de).

9.3Unwanted connections under Windows XP

Windows XP computers attempt to compare their clocks with a timeserver on the Internet at start-up. This is why when a Windows XP in the WLAN is started, a connection to the Internet is established by the LANCOM.

To resolve this issue, you can turn off the automatic time synchronization on the Windows XP computers under Right mouse click on the time of day Properties Internet time.

9.4Cable testing

LANCOM1711VPN only

A cabling defect might have occurred, if no data is transmitted over LAN or WAN connection, although the configuration of the devices does not show any discernible errors.

You can test the cabling with the built-in cable tester of your LANCOM. Change under WEBconfig to menu item Expert configuration Status

LAN statistics

Cable test. Enter here the name of the interface to be

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Contents Lancom 821 ADSL/ISDN Lancom 1621 ADSL/ISDN Lancom 1711 VPN Lancom Systems GmbH, Wuerselen Germany. All rights reserved Security settings PrefaceThank you for placing your trust in this Lancom product Model variants Preface Contents Providing dial-up access Installation of the MS Windows fax service Sending a faxLinking two networks Sending faxes with LancapiSecurity checklist TroubleshootingAppendix Access to a complete local network LAN IntroductionHow does Adsl work? AddressesAll services via a single cable-thanks to the splitter Ideal for Internet surfersADSL-over-ISDN or ADSL-over-POTS? CodeWhich use does VPN offer? Conventional network infrastructure Networking via the Internet Firewall Denial-of-Service Protection Quality-of-Service / Traffic managementWhat does a router do? Bridgehead to the WAN Areas of deployment for routersAt least one for WAN connections LAN to LAN coupling via VPN or IsdnRemote access to the company network via VPN or Isdn What can your Lancom do?Conventional via Isdn WAN connection Configuration Installation Package contentsSystem preconditions Introducing Lancom Status displaysFront side Top panel Meanings of the LEDsLED remains lit green Flashing Power LED but no connection? Online LED indicates the overall status of all WAN portsConnection status of the Adsl link Connection status of the WAN connectionData traffic via the Adsl link Data traffic via the DSL connectionStatus of the four LAN ports in the integrated switch Separate status display for both Isdn B channelsBack of the unit Hardware installation Adsl connector cable transparent plugs Using the included power adapterSoftware installation Starting Lancom setupWhich software should you install? Basic configuration 1 TCP/IP settingsWhich information is necessary? New LAN-fully automatic configuration possible Configure manually nevertheless?Information required for manual TCP/IP configuration IP address and netmask for the LancomConfiguration protection Settings for the DSL connectionSettings for the Isdn connection Enable Dhcp server?Instructions for LANconfig Start up LANconfig by clicking Start Programs LancomLANconfig Connect charge protectionComplete the configuration with Finish Instructions for WEBconfig Network without Dhcp serverStarting the wizards in WEBconfig Network with Dhcp serverOr with a name as discribed above Basic configuration Entering the password in the web browser TCP/IP settings to workstation PCs IP address assignment via the Lancom defaultIP address assignment via a separate Dhcp server Manual IP address assignmentBasic configuration Setting up Internet access Does the setup wizard know your Internet provider?Additional information for unknown Internet providers User name and password Protocol PPPoE, Pptp or Plain Ethernet IPoEAdditional connection options Dynamic channel bundling Isdn onlyTools Setup Wizard LANconfig Quick access to the setup wizardsComplete the configuration with Apply Always configure both sides Linking two networksSecurity aspects What information is necessary? General informationIsdn Settings for the TCP/IP router Settings for the IPX router DNS access to the remote LANExtranet VPN Settings for NetBIOS routing Perform the configuration on both routers, one at a time Ping quick testing for TCP/IP connections Providing dial-up access Which information is required?Coupling Entry Settings for TCP/IP Isdn calling line identity CLISettings for IPX WANSettings for the dial-in computer Dial-up via VPNDial-up via Isdn Instructions for LANconfig Instructions for WEBconfig Sending faxes with Lancapi Installation of the Lancom Capi fax modem Lancom CDInstallation of the MS Windows fax service Select the option Printers and Faxes from the control panelSend a fax with the MS Windows fax service Sending a faxSend a fax with any given office application Sending faxes with Lancapi Security settings Security settings wizardWizard for LANconfig Wizard for WEBconfig Firewall wizardSecurity checklist Configuration under WEBconfigRules Have you assigned a password for the configuration? Have you permitted remote configuration?Have you activated the Firewall? Do you make use of a ’Deny All’ Firewall strategy?Is your saved Lancom configuration stored in a safe place? Have you closed critical ports with filters?Troubleshooting Problems with the cabling?No WAN connection is established DSL data transfer is slowCable testing Unwanted connections under Windows XPIncreasing the TCP/IP window size under Windows LAN statisticsTroubleshooting Performance data and specifications AppendixATM Contact assignment Adsl interfacePin RJ45 socket Ethernet WAN interface Lancom 1711 VPN ISDN-S0interfacePin RJ45 socket, corresponding to ISO 8877, EN Configuration interface Outband CE declaration of conformityEthernet interfaces 10/100Base-T Pin mini-DIN socketIndex NumericsFirmSafe IPX conventions Flat rate IPX router Settings Hardware installation 1TR6 Caller IDInstallation Connection Connector cable Configuration port ChannelPower adapter 21, 27 NetBIOSSecurity aspects Server Setup Specify MSN LAN to LAN coupling 17, 18, 19, 34Settings Stateful Inspection Telephone Online PowerVoltage switch WAN data VPN client WAN status Switch System preconditions Connector cable WAN connection
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1621, 1711, 821 specifications

Lancom Systems is a notable player in the networking solutions market, and its range of routers, specifically the 821, 1621, and 1711 models, showcases the company's commitment to delivering robust, high-quality products for various enterprise needs. Each model brings distinct features, making them suitable for different environments and operational demands.

The Lancom 821 is particularly designed for small to medium-sized enterprises (SMEs) requiring reliable internet connectivity and secure networking. This router supports various VPN technologies, ensuring secure data transmission across the organization. Equipped with advanced firewall capabilities, the 821 can handle multiple connections while protecting against potential cyber threats. Its support for IPv6 enhances compatibility with future networks, making it a long-term investment. The device’s manageable architecture allows for remote access and troubleshooting, reducing the need for on-site IT interventions.

On the other hand, the Lancom 1621 is tailored for larger organizations or those with more extensive networking demands. This model offers enhanced throughput and is capable of managing large volumes of traffic without compromising performance. It features a variety of WAN connection options, including DSL, LTE, and fiber, allowing businesses to choose the best solution for their requirements. The 1621 also incorporates sophisticated Quality of Service (QoS) settings, which prioritize critical applications to ensure optimal performance during peak times. Built-in redundancy features enhance reliability, making it an excellent choice for mission-critical applications.

The Lancom 1711 takes networking capabilities a step further, targeting enterprises with even more complex needs. It boasts advanced routing and switching features, making it suitable for enterprise-grade deployments. The 1711 supports enterprise WLAN management, allowing seamless integration with wireless access points. Its robust performance over WAN connections enables the deployment of various real-time applications, such as voice over IP (VoIP) and video conferencing, without latency issues. Security is a top priority, with features including an IPSec VPN and integrated threat detection to safeguard organizational data.

In summary, the Lancom 821, 1621, and 1711 routers serve as versatile tools for businesses, each designed with distinct capabilities to meet specific networking needs. Their strengths lie in their security features, support for various connection types, and reliable performance under heavy loads. With these devices, organizations can ensure that their network infrastructure not only meets current demands but is also poised for future growth.
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