MAESTRO WIRELESS E206XT 3G WiFi Router User Manual
MAESTRO WIRELESS HOLDINGS LIMITED 3G WiFi Router
User manual
QUICK START GUIDE-M2M products E200 Series – Cellular / WAN / LAN / Wi-Fi Router Version 1.1 Maestro E200 Series www.maestro-wireless.com Copyright Copyright© 2015 Maestro Wireless Solutions Limited. All right reserved. This document is for the use of intended recipients only and the contents may not be reproduced, redistributed, or copied in whole or in part for any purpose without Maestro prior express consent. Note: This document is subject to change without notice This manual cover the following M2M products: Maestro E205XT02 Maestro E205XT04 Maestro E20“XT DOCUMENT VERSION DATE 1.0 Initial document release 2“ Sep. 14 1.1 Added illustration 18 Mar. 15 Maestro E200 Series www.maestro-wireless.com This manual is written without any warranty. Maestro Wireless Solutions Ltd. reserves the right to modify or improve the product and its accessories which can also be withdrawn without prior notice. Our company stresses the fact that the performance of the product and its accessories depends on the proper use conditions as well as the surrounding environment. Maestro Wireless Solutions Ltd. assumes no liability for damage incurred directly or indirectly from errors, omissions or discrepancies between the router and this manual. This software, solution or application is provided on an "as is" basis. No warranty whether expressed or implied is given by Maestro Wireless Solutions Ltd. in relation to this software, solution or application. User shall assume the entire risk of using or relying on this software, solution, and application. In no event will Maestro Wireless Solutions Ltd. be liable for any loss or damage including without limitation, indirect or consequential loss, damage, or any loss, damage Maestro E200 Series www.maestro-wireless.com whatsoever arising from loss of data or profit arising out of, or in connection with, the use of this router product. Every effort is made to keep the product and its software up and running smoothly. However, Maestro Wireless Solutions Ltd. takes no responsibility for, and will not be liable for, the product or its software being temporarily unavailable due to technical issues beyond our control. The above terms and conditions are subject to change without prior notice. The present use of this product solution implies that the user approves and understands all the above terms and conditions. Maestro E200 Series www.maestro-wireless.com Table of Contents SAFETY PRECAUTIONS ............................................................................................................ 7 GENERAL PRECAUT)ONS ....................................................................................................................... US)NG T(E ROUTER )N VE()CLE .......................................................................................................... PROTECTING YOUR ROUTER ................................................................................................ 7 PRODUCT OVERVIEW ............................................................................................................10 SER)ES AT A GLANCE ................................................................................................................ BUNDLE CONTENT ............................................................................................................................... PHYSICAL DIMENSIONS AND LED ......................................................................................13 P(YS)CAL D)MENS)ONS ....................................................................................................................... LED )ND)CATORS ................................................................................................................................. ET(ERNET PORT LED )ND)CATORS .................................................................................................. 10 11 12 13 PREREQUISITES ......................................................................................................................... 8 USER MANUAL CONVENTIONS .............................................................................................. 8 OVERVIEW ................................................................................................................................... 8 SCOPE ...................................................................................................................................................... TARGET AUD)ENCE ................................................................................................................................ PRODUCT FEATURES .............................................................................................................12 HARDWARE INSTALLATION .............................................................................................17 )NSTALL T(E S)M CARD ................................................................................................................... CONNECT T(E CELLULAR WWAN ANTENNA S .................................................................... CONNECT T(E LAN CABLE ............................................................................................................. CONNECT T(E POWER SUPPLY ....................................................................................................... E205 BASIC CONFIGURATION ..........................................................................................19 CONNECT)NG TO T(E WEB )NTERFACE ......................................................................................... LAN CONF)GURAT)ON ...................................................................................................................... WAN CONF)GURAT)ON .................................................................................................................... 11.3.1 Manual .............................................................................................................................................. 21 11.3.2 Automatic ........................................................................................................................................ 22 11.3.3 PPPoE ................................................................................................................................................ 22 CELLULAR SETUP .............................................................................................................................. W)RELESS W)-F) ........................................................................................................................... E205 ADVANCED CONFIGURATION ................................................................................25 FLAS()NG F)RMWARE AND UPDAT)NG YOUR DEV)CE .................................................................. APPENDIX ................................................................................................................................27 DEFAULT SETT)NGS .......................................................................................................................... RESET TO FACTORY DEFAULT SETT)NG ......................................................................................... 13.2.1 Using the web-based user interface .................................................................................... 27 Maestro E200 Series www.maestro-wireless.com 13.2.2 Using the reset button on the side of the router ............................................................ 29 L)ST OF ACRONYMS ........................................................................................................................... “ Maestro E200 Series www.maestro-wireless.com 1 Safety Precautions 1.1 General precautions The router generates radio frequency (RF) power. When using the router, care must be taken to ensure safety as well as compliance with all the regulations surrounding the use of RF equipment. Do not use the router in aircraft, hospitals and petrol stations or in places where using GSM products or other RF equipment is prohibited. Be sure that the router will not be interfering with nearby equipment such as pacemakers or medical equipment. The antenna of the router should be directed away from computers, office equipment, home appliance, etc. Always keep the router at a minimally safe distance of 2“.“cm or more from a human body. Do not put the antenna inside metallic boxes or other containers 1.2 Using the router in vehicle Check for any regulation or law authorizing the use of GSM equipment in vehicles in your country before installing the router. Installation of the router should be done by qualified personnel. Consult your vehicle dealer for any possible interference concerns related to the use of the router. Be careful when the router is powered by the vehicle’s main battery. The battery may be drained after extended period. 1.3 Protecting your router To ensure error-free usage, please install and operate your router with care and comply with the following: Do not expose the router to extreme conditions such as high humidity/rain, high temperatures, direct sunlight, caustic/harsh chemicals, dust, or water. ” Maestro E200 Series www.maestro-wireless.com Do not try to disassemble or modify the router as there are no user serviceable parts inside and the warranty would be void in case of tampering. Do not drop, hit or shake the router. Do not use the router under extreme vibrating conditions. Do not pull the power supply cable. Please attach or detach it by holding the connector after switching off the supply. Install and connect the router in accordance to the instruction manual. Failure to do so will void the warranty. 2 Overview 2.1 Scope This document provides you all the information you need to set-up, configure and use the Maestro E200 Series router. 2.2 Target audience This document is intended for customers and integrators who understand basic telecommunications and information technology terminology and concepts. 3 Prerequisites Before continuing with the installation of your E200 Series router, make sure you have a computer equipped with the following: A computer with an Ethernet port A web browser such as Google Chrome, Mozilla Firefox, Apple Safari or Internet Explorer 4 User manual conventions The following symbols are used throughout the user manual: Maestro E200 Series www.maestro-wireless.com he following symbol ind dicates atten ntion must be b paid Th he following symbol ind dicates a warrning Th he following symbol pro ovides inform mation Th estro E200 Series Mae www.m maestro-wireless.com 5 Product overview 5.1 E200 Series at a glance Dual-band HSDPA (E205XT020), tri-band HSDPA (E205XT04), quad-band HSPA+ & dual-band EV-DO (E20“XT) GPRS/EDGE auto-fallback LAN on RJ45 port Switchable WAN/LAN on RJ45 port (E20“XT only) Built-in Wi-Fi with an external RP-SMA antenna connector Automatic WAN / 3G failover Built-in GPS supporting active antenna via an external SMA connector (E205XT02, E205XT04 only) Built-in concurrent diversity/GPS antenna supporting active antenna via an external SMA connector (E20“XT only) External SMA antenna connectors for 3G Two digital inputs/outputs Six color LED’s for displaying for Wi-Fi and network activity, signal, power and alarm Device management and configuration via a web GUI DIN rail mountable 5.2 Bundle content E200 Series router x 1 1m Ethernet cable 8P8C x 1 2G/3G/4G terminal antenna ˄Length> 20mm˅ SMA x 1 3.8 dBi, 2.4/5.1~5.9 GHz dipole antenna RP-SMA (M) hinged 90° x 1 Industrial grade 1.2 A power supply x 1 DIN clip x 1 10 Maestro E200 Series www.maestro-wireless.com If any of these items are missing or damaged, please contact Maestro Support immediately. The Maestro Support website can be found at: http://support.maestrowireless.com/ 11 Maestro E200 Series www.maestro-wireless.com 6 Product features With high-speed cellular (3G and beyond), WAN, LAN and Wi-Fi connectivity, the E200 is a highly versatile, reliable and rugged router designed for mission-critical enterprise applications requiring faultless connectivity. The E200 comes in two models; the cost-effective HSDPA ensures always- on connectivity for 2G migration or low-latency applications such as energy and sales & payment, while the HSPA+ penta-band is ideal for deployment in vertical markets requiring high-speed data or global roaming, such as security and transportation. The E200 can be configured through an easy-to-use web interface; a configuration wizard will help the user set-up the router step-by-step and select their primary and redundancy network. Advanced configuration setting for functions such as VPN, IPsec, OpenVPN and Wi-Fi hotspot are also directly available through the web interface. Once configured, a set of “ LED’s on the top of the aluminum alloy casing will help the user ensure that the device is operating correctly. Users can also remotely manage the router is also available through an HTTPS connection over the LAN or WAN. 12 Maestro E200 Series www.maestro-wireless.com 7 Physical dimensions and LED 7.1 Physical dimensions E200 Series dimensions without connector 13 Maestro E200 Series Lenght 83.9mm Depth “0mm Height 25mm Weight 90g www.maestro-wireless.com 7.2 LE ED indicattors The E200 Series features “ LEDs on the front to dissplay critical system info rmation NA AME COLOUR WI-FI Actiivity Netw work Sign nal STATE DESCRIP PTION OFF Wi-Fi network iss deactivated Flashing Wi--Fi network connnection traffic ON Wi-Fi network iis activated OFF Cellula ar data service is not connecte ed Flashing Cellular data seervice traffic ON Cellu ular data servicce is connected OFF SIM card is no ot inserted Flashing Device is registered on tthe cellular nettwork ON SIM card is inserted OFF No signal (C CSQ<10) Weak signal (10020) OFF Power off ON Power on OFF No alert, device is ruunning smoothly Flashing So oftware fault (crrash, issues…) Pow wer Alerrt ON 14 aestro E200 Series Ma Hardware e fault (high tem mperature, problem with module orr SIM card) www.m maestro-wireless.com 15 Maestro E200 Series www.maestro-wireless.com 7.3 Eth hernet po ort LED in ndicators The E200 Series router featu ures two Eth hernet ports with two LE ED. LLED Grreen Am mbe 1“ STA ATUS DESCRIPTION On Therre is a valid network link k. Blink king Therre is activity on the netw work link. Off No valid networrk link detected. On The Ethernet po ort is operating at a spee ed of 1000M Mbps. Off aestro E200 Series Ma The Ethernet po ort is operating at a spee ed of 10/1000Mbps or no Ethe ernet cable iss connected. www.m maestro-wireless.com 8 Hardware installation 8.1 Install the SIM card SIM card(s) should be inserted into the SIM tray as illustrated in the image below. SIM card contact should be face up. 8.2 Connect the Cellular (WWAN) Antenna(s) Connect the cellular antenna to the Cellular connector (SMA Female) on the unit. If the unit is equipped with a secondary cellular antenna connector Div. , it is highly recommended to connect an additional antenna to this connector for diversification. Dual antennas will provide improved signal strength thus better performance. Note: For most applications, the antenna(s) included with the unit will provide suitable reception, but some circumstances/environments may require a higher quality antenna or one mounted in a different location. If this is the case, Maestro has many antenna options to chose from, please contact us or visit maestro-wireless.com. 1” Maestro E200 Series www.maestro-wireless.com 8.3 Co onnect th he LAN C Cable Connect one en nd of the Eth hernet cable to the LAN N port on th he unit and tthe other en nd to a LAN port on o a PC. 8.4 Co onnect th he power supply Connect the Miccro-Fit 4-pin n male conneector of the power supp ply to the po ower connecctor loca ated on the LAN side of the unit. 18 aestro E200 Series Ma www.m maestro-wireless.com 9 E205 5 Basic con nfigurration 9.1 Co onnecting g to the w web interfface Connect the LAN interface of o your E200 0 to a computer via the RJ-45 cablee and and start e device LAN N IP addresss in the brow wser addresss field. yourr web browsser. Enter the http://1 192.1“8.1.1 Note: Iff you change e the IP add dress, remem mber to rebo oot the routeer and enterr the new IP address into o your browsser address bar. You will be invitted to enter the admin u username an nd password d: Default login – adm min Default password – admin (Thiss is the defa ault usernam me and passw word for Maestro routers. The admin n and read-only userr passwords can be chan nged at Systtem>Adminis stration Afte er successfully login the Quick Setup p page will show up FFigure 1: Quick Setu up If yo ou need to access advan nced featuree you can navigate directly in the meenu. 19 aestro E200 Series Ma www.m maestro-wireless.com If yo ou want to follow the qu uick user gu ide click on the Next bu utton and yo ou will enter quicck setup pag ge. Since E200 has multiple WAN in nterfaces, the e default priority setting gs for switching between various WAN interfacess is as follow ws and canno ot be changeed in Quick up. To make any changes the WAN priority settiings, please go to the N Network / Lo oad setu Bala ancing Tab Priority 1 – Wired WAN Priority 2 – Wi-Fi ass WAN (WWA WAN) (Wi-Fi in Client Mode) Priority 3 – Cellular In th he quick setup page, you can perforrm basic con nfiguration settings for tthe LAN, WA AN, Cellular and Wi-Fi interfacess. All other cconfiguration ns will be sett to the facttory default or prevviously saved d values.. 9.2 LA AN config guration The LAN configuration page e is used to configure th he LAN settings of the rrouter Figure 2: IP addresss The modem rou uter is shippe ed preconfig gured to use e private IP addresses on n the LAN side, and to act as a DHCP server. The modeem router’s default LAN IP configuraation is as follo ows: LAN IP address: 192 2.1“8.1.1 IPv4 Netmask : 255..255.255.0 20 aestro E200 Series Ma www.m maestro-wireless.com These addresses are part of the designated private address range for use in private networks, and should be suitable in most applications. If your network has a requirement to use a different IP addressing scheme, you can make those changes here and click. The LAN TCP/IP Setup settings are IPv4 Address: This is the LAN IP address of the modem router. IPv4 Netmask: This is the LAN subnet mask of the modem router. Combined with the IP address, the IP subnet mask allows a device to know which other addresses are local to it, and which must be reached through a gateway or modem router. Advanced LAN configuration parameters could be found under Network/Interfaces, under LAN parameters click Edit > Advanced Settings. 9.3 WAN configuration By default the WAN is in automatic mode, you can also set it to Manual or PPPoE 9.3.1 Manual IPv4 Address: The IP address to assign to the selected WAN interface. IPv4 Netmask: The Subnet mask of the IP address above. IPv4 Gateway: The gateway to assign this WAN interface. DNS server: The DNS server for the WAN interface. 21 Maestro E200 Series www.maestro-wireless.com 9.3.2 Automatic The WAN will be setup automatically. 9.3.3 PPPoE (Point-to-Point Protocol over Ethernet) Acquire IP Address automatically from your Provider using the PPPoE protocol. Many DSL providers use PPPoE. To acquire an IP Address from the PPPoE server, a username and password are required. Ask your Provider for your username and password if you don’t know them. Advanced WAN configuration parameters could be found under Network/Interfaces, under WAN parameters click Edit > Advanced Settings. 9.4 Cellular Setup You can enter the cellular settings like APN, SIM PIN for security, Username and Password corresponding to your cellular connection (SIM Card), which you will receive from your Cellular Operator. APN: Access Point Name, enter the access point name provided by your network operator PIN: If required please enter your SIM card’s PIN code Username and Password: If required enter login credentials provided by your network operator 22 Maestro E200 Series www.maestro-wireless.com Advanced cellular configuration parameters could be found under Network/Interfaces, under 3G parameters click Edit > Advanced Settings. 9.5 Wireless (Wi-Fi) By default, the Wi-Fi is in Access Point mode: Default SSID: Maestro E200 Default Password: W1rele$$ The E200 Wi-Fi can be configured either as An Access Point, in which case, the Wi-Fi acts as a LAN or As a Wi-Fi Client in which case, the E200 connects to an external Wi-Fi source which will be the source of Internet or WAN for the E200. Default security settings used are WPA-PSK, WPA2-PSK Mixed Mode. You can choose your encryption and change your password accordingly. Bring up on boot tick box in Wireless section by default is enabled. Ticking the box will enable the Wi-Fi (Wireless) interface every time the Router Reboots. 23 Maestro E200 Series www.maestro-wireless.com Wi-FFi section fro om this Quicck setup pag ge will disap ppear when The defa ault Wi-Fi in nterface is reemoved from m Network / Wi-Fi page When you scan for available Wii-Fi networks and conve ert the Routeer to Client Mode. If yo ou create mu ultiple access point netw works (Multip ple SSDI’s), the t additionaal Wi-Fi netw works create ed will not sh how up in Q Quick Setup. Advanced Wi-Fi configuratio on parameteers could be e found unde er Network/W Wi-Fi, under Wire eless Overvie ew paramete ers click Editt > Advanced d Settings. Oncce the Quick Setup is do one, you will have basic LAN connec ctivity, Intern net access ov ver WAN and/or Cellular and Wi-Fi w will be configured as Ac ccess Point. To verify that your se etup were su uccefully app plied and your router is now running go to N Network/Interrfaces. 24 aestro E200 Series Ma www.m maestro-wireless.com 10 E205 advanced configuration 10.1 Flashing firmware and updating your device E200 Series can be updated through the web interface. Go to System/Back-up / Flash Firmware. Under Flash new firmware image, click on Choose File and locate the .bin file on your computer. Once the file located on the computer click Flash image… 25 Maestro E200 Series www.maestro-wireless.com Clickk Proceed The system will now be flashing. DO NOT T POWER OF FF THE DEVIC CE! utes before you try to reeconnect. It might be ne ecessary to rrenew the Waitt a few minu address of your computer to reach the device again, depending on your seettings. 2“ aestro E200 Series Ma www.m maestro-wireless.com 11 1 App pendix 11.1 De efault setttings The following ta ables list the e default setttings for the e E200 Seriess router. Note e: The admin manager account allow ws you to manage all se ettings of th he router exccept funcctions such as a …., which are privilegeed only to the root man nager accoun nt. LAN ((MANAGEMENT) Static IP Address: 192 2.1“8.1.1 Sub bnet Mask: 255 5.255.255.0 Deffault Gatewa ay: 192 2.1“8.1.1 ADMIN MANAGER ACCOU UNT ROOT MANAGER ACCOUN NT Use ername: admin Use ername: root Passsword: admin Password: admin E20 00 SERIES RO OUTER TELN NET ACCESS Username: root Password: admin 11.2 Re eset to fa actory deffault settiing Resttoring factorry defaults will w reset the E200 Seriess router to itts factory deefault conffiguration. You may encounter a situ uation where e you need to restore th he factory defa aults on your E200 Series router succh as: You havve lost your username an d and are un nable to logiin to the we eb nd password configurration page You are asked to pe erform a facttory reset by y Maestro su upport staff.. Therre are two methods you u can use to restore facttory default settings on yyour E200, usin ng the web-b based user in nterface or u using the reset button on o the side o of the router. 11.2 2.1 Using the t web-bassed user interface To rrestore your router to itss factory deffault settingss, please follow these stteps: 2” aestro E200 Series Ma maestro-wireless.com www.m Open a browser window and navigate to the IP address of the router (default address is http://192.1“8.1.1). Login to the router using root as the User Name and admin as the password. Click the System item from the top menu bar, then Backup / Flash Firmware and then under Flash operations select the Actions tabs. Under the Actions tabs, click the Perform reset button. The router asks you to confirm that you wish to reset all changes. Click OK to continue. The router will erase the configuration partition and reboot. 28 Maestro E200 Series www.maestro-wireless.com 11.2.2 Using the reset button on the side of the router Use a pin to push the Reset button on the device for XX seconds. The router will restore the factory default settings and reboot. When you have reset your E200 Series router to its default settings you will be able to access the device’s configuration web interface using http://192.1“8.1.1 with username admin or root and password admin. 29 Maestro E200 Series www.maestro-wireless.com 11.3 List of acronyms Acronym Expansion / Meaning 2G 2nd Generation 3G 3rd Generation ADSL Asymmetric digital subscriber line, ADSL is a type of DSL broadband communications technology used for connecting to the Internet AES Advanced Encryption Standard AP Client Access Point Client CSQ DHCP Dynamic Host Configuration Protocol (DHCP) is a standardized networking protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services. DIN DIN connector is an electrical connector that was originally standardized by the Deutsches Institut für Normung (DIN) DMZ In computer security, a DMZ or Demilitarized Zone is a physical or logical sub network that contains and exposes an organization's external-facing services to a larger and un-trusted network, usually the Internet. DNS Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network DynDNS, DDNS Dynamic DNS (DDNS) is a method of automatically updating a name server in the Domain Name System (DNS), often in real time, with the active DNS configuration of its configured hostnames, addresses or other information. EDGE Enhanced Data rates for GSM Evolution (EDGE) is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM. GPRS General packet radio service (GPRS) is a packet oriented mobile data service on the 2G and 3G cellular communication system's global system for mobile communications GSM Global system for mobile communications HT Physical mode High Throughput Physical Mode ICMP Internet Control Message Protocol (ICMP) is one of the main protocols of the Internet Protocol Suite. It is used by network devices, like routers, to send error messages IGMP Internet Group Management Protocol is a communications protocol used by hosts and adjacent routers on IP networks to establish multicast group memberships IP Sec Internet Protocol Security is a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session ISP Internet service provider L2TP Layer 2 Tunneling Protocol is a tunneling protocol used to support virtual private networks LAN Local Area Network Acronym Expansion / Meaning LLTD Link Layer Topology Discovery is a proprietary Link Layer protocol for network topology discovery and quality of service diagnostics M2M Machine to machine MAC address Media access control address is a unique identifier assigned to network interfaces for communications on the physical network segment MTU 30 Maestro E200 Series Maximum transmission unit of a communications protocol of a layer is the size (in www.maestro-wireless.com bytes) of the largest protocol data unit that the layer can pass onwards NAT Network address translation is a methodology of modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device for the purpose of remapping one IP address space into another. NTP Network Time Protocol is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks PPPoE Point-to-Point Protocol over Ethernet PPTP Point-to-Point Tunneling Protocol PSK Pre-shared key QoS Quality of Service RF Radio Frequency Rx Reception SIM Subscriber identity module SMA SMA (Sub Miniature version A) connectors are semi-precision coaxial RF connectors SMS Short Message Service SPI Serial Peripheral Interface SSID Service set identification TCP Transmission Control Protocol TKIP Transmission Control Protocol Tx Transmission UDP User Datagram Protocol UPnP Universal Plug and Play VPN Virtual private network WAN Wide Area network WCDMA Wideband Code Division Multiple Access WDS Wireless distribution system WEP Wired Equivalent Privacy, is a wireless network security standard Wi-Fi Local area wireless technology that allows an electronic device to exchange data or connect to the internet using 2.4 GHz UHF and 5 GHz SHF radio waves 31 WPA Wi-Fi Protected Access WPA2 Wi-Fi Protected Access II Maestro E200 Series www.maestro-wireless.com 11.4 Support There are several resources available to you for support and troubleshooting of your Maestro product or for resolving configuration difficulties at Maestro’s support website, http://support.maestro-wireless.com/knowledgebase.php. Try these troubleshooting steps to eliminate your problem. After working through these steps and if your problem is not solved, please send a ticket to Maestro support team. Fill out an Online Support Request via: http://support.maestrowireless.com/index.php?a=add. You will need to create a user account if one is not already set up. When submitting a support request, please include a copy of the System Log file from the unit’s and the configuration files. This will greatly improve the quality of the initial response you receive. Without this file, it is often very difficult for the support team to provide accurate answers to your queries. To create a copy of the system login on your router and go to Status > System Log. Select the entire log, copy it and paste it on a new document file . To generate an archive of your configuration go to System > Backup / Flash Firmware, under the Actions tabs click on Generate archive. 32 Maestro E200 Series www.maestro-wireless.com An archive file backup-Maestro-201x-xx-xx.tar.gz will be downloaded on your default download folder, please attached the file while filling the support request online. 33 Maestro E200 Series www.maestro-wireless.com
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