WRE2205 Wireless N300 Range Extender Version 1.00 Edition 1, 06/2012 Quick Start Guide User’s Guide Default Login Details LAN IP Address http://192.168.1.2 User Name www.zyxel.
IMPORTANT! READ CAREFULLY BEFORE USE. KEEP THIS GUIDE FOR FUTURE REFERENCE. Related Documentation • Quick Start Guide The Quick Start Guide shows how to connect the WRE2205 and access the Web Configurator wizards. (See the wizard real time help for information on configuring each screen.) It also contains a connection diagram and package contents list. Note: It is recommended you use the Web Configurator to configure the WRE2205.
Contents Overview Contents Overview User’s Guide .........................................................................................................................................7 Introduction ...............................................................................................................................................9 The Web Configurator .............................................................................................................................
Table of Contents Table of Contents Contents Overview ..............................................................................................................................3 Table of Contents .................................................................................................................................4 Part I: User’s Guide ........................................................................................... 7 Chapter 1 Introduction..........................................
Table of Contents 5.1 Overview ...........................................................................................................................................29 5.2 Connecting a Wireless Client using WPS .........................................................................................29 5.2.1 Push Button Configuration (PBC) ............................................................................................29 5.2.2 PIN Configuration ..............................................
Table of Contents 9.2 What You Can Do .............................................................................................................................55 9.3 Firmware Upload Screen ..................................................................................................................55 9.4 Configuration Screen ........................................................................................................................56 9.4.1 Backup Configuration ..........................
P ART I User’s Guide 7
C HAPT ER 1 Introduction 1.1 Overview The WRE2205 (N) is a universal repeater that is an access point and a wireless client at the same time. The WRE2205 (N) wirelessly relays communications from its wireless clients to the access point. LEW Figure 1 Universal Repeater WLAN AP N Your can create the following connections using the WRE2205: • LAN. You can connect network devices via the Ethernet port of the WRE2205 so that they can communicate with each other and access the Internet. • WLAN.
Chapter 1 Introduction 1.2 Securing the WRE2205 Do the following things regularly to make the WRE2205 more secure and to manage the WRE2205 more effectively. • Change the password. Use a password that’s not easy to guess and that consists of different types of characters, such as numbers and letters. • Write down the password and put it in a safe place. • Back up the configuration (and make sure you know how to restore it).
Chapter 1 Introduction Table 1 Front Panel LEDs and WPS Button (continued) LED STATUS Wi-Fi Blinking The WRE2205 is sending/receiving data through the wireless LAN. Off The wireless LAN is not ready or the LED is turned off in the firmware. On The WRE2205 is receiving power and functioning properly. Blinking The WRE2205 is resetting to factory defaults. Power WPS LAN DESCRIPTION Off The WRE2205 is not receiving power or the LED is turned off in the firmware. On WPS status is configured.
Chapter 1 Introduction 12 WRE2205 User’s Guide
C HAPT ER 2 The Web Configurator 2.1 Overview This chapter describes how to access the WRE2205 Web Configurator and provides an overview of its screens. The Web Configurator is an HTML-based management interface that allows easy setup and management of the WRE2205 via Internet browser. Use Internet Explorer 6.0 and later versions, Mozilla Firefox 3 and later versions, or Safari 2.0 and later versions. The recommended screen resolution is 1024 by 768 pixels.
Chapter 2 The Web Configurator Figure 3 Login Screen 2.3 Resetting the WRE2205 If you forget your password or IP address, or you cannot access the Web Configurator, press the WPS button for more than 10 seconds to reload the factory-default configuration file. This means that you will lose all configurations that you had previously saved, the username will be reset to admin and password will be reset to 1234. The IP address will be reset to “192.168.1.2”. 14 1 Make sure the power LED is on.
C HAPT ER 3 Connection Wizard 3.1 Overview This chapter provides information on the wizard setup screens in the Web Configurator. The Web Configurator’s wizard setup helps you configure your device. After you access the WRE2205 Web Configurator, click to start wizard setup. 3.
Chapter 3 Connection Wizard The following table describes the labels in this screen. Table 2 Wizard Step 1: LAN TCP/IP LABEL DESCRIPTION Get from DHCP Server Click this to enable the DHCP client of the WRE2205 to get the IP configuration automatically. User Defined LAN IP Click this to enable the manual IP configuration. IP Address Type the IP address of your WRE2205 in dotted decimal notation 192.168.1.2 (factory default).
Chapter 3 Connection Wizard Figure 5 Wizard Step 2: Selecting an AP The following table describes the labels in this screen. Table 3 Network > Wireless LAN > AP Select LABEL DESCRIPTION Select Use the radio button to select the wireless device to which you want to connect. SSID This displays the Service Set IDentity of the wireless device. The SSID is a unique name that identifies a wireless network. All devices in a wireless network must use the same SSID.
Chapter 3 Connection Wizard Table 3 Network > Wireless LAN > AP Select (continued) LABEL DESCRIPTION BACK Click this to go back to the previous step in the wizard. NEXT Click this to start the next step in the AP setup process. EXIT Click this to exit the wizard. Previous Click this to see the previous page of APs. Next Click this to see the next page of APs.
Chapter 3 Connection Wizard 3.3.2 Manually Configuring AP Parameters If the AP you want to connect to is not listed, then follow these steps to configure the security settings of the AP manually. 1 Select Setup repeater manually. 2 Type the SSID of the AP into the SSID field. Figure 7 Wizard Step 2: Typing the SSID 3 Configure the security settings. The number of characters accepted by the KEY field is shown in the following table.
Chapter 3 Connection Wizard Figure 8 Wizard Step 2: Configuring Security Settings 3.4 Completing the Connection Wizard 1 20 Click Next. The key verification screen appears.
Chapter 3 Connection Wizard Figure 9 Wizard Step 3: Verifying the Key The following screen appears if the key fails to verify. Click BACK and check the key. Figure 10 Wizard Step 3: Key Verification Failed 2 Click Apply to complete the wizard setup.
Chapter 3 Connection Wizard Figure 11 Connection Wizard Complete 22 WRE2205 User’s Guide
C HAPT ER 4 Status 4.1 WRE2205 Status The screen below shows the status screen. Figure 12 Status Screen The following table describes the icons shown in the Status screen. Table 6 Status Screen Icon Key ICON DESCRIPTION Click this icon to open the setup wizard. Click this icon to view copyright and a link for related product information.
Chapter 4 Status Table 7 Web Configurator Status Screen (continued) LABEL Firmware Version DESCRIPTION This is the current firmware version of the WRE2205. LAN Information - MAC Address This shows the LAN Ethernet adapter MAC Address of your device. - IP Address This shows the LAN port’s IP address. - IP Subnet Mask This shows the LAN port’s subnet mask. - DHCP This shows the LAN port’s DHCP role. WLAN Information - MAC Address This shows the wireless adapter MAC Address of your device.
Chapter 4 Status 4.1.1 Summary: Packet Statistics Click the Packet Statistics (Details...) hyperlink in the Status screen. Read-only information here includes port status, packet specific statistics and the "system up time". The Poll Interval(s) field is configurable and is used for refreshing the screen. Figure 13 Summary: Packet Statistics The following table describes the labels in this screen. Table 8 Summary: Packet Statistics LABEL DESCRIPTION Port This is the WRE2205’s port type.
Chapter 4 Status Figure 14 Summary: WLAN Station Status The following table describes the labels in this screen. Table 9 Summary: WLAN Station Status LABEL DESCRIPTION # This is the index number of an associated wireless station. MAC Address This field displays the MAC address of an associated wireless station. Association Time This field displays the time a wireless station first associated with the WRE2205’s WLAN network. Refresh Click Refresh to reload the list. 4.
Chapter 4 Status Table 10 Menus (continued) LINK TAB FUNCTION AP Select Use this screen to connect to an access point. General Use this screen to configure wireless LAN. MAC Filter Use the MAC filter screen to allow devices to access the WRE2205. Advanced This screen allows you to configure advanced wireless settings. QoS Use this screen to configure Wi-Fi Multimedia Quality of Service (WMM QoS).
Chapter 4 Status 28 WRE2205 User’s Guide
C HAPT ER 5 Tutorials 5.1 Overview This chapter provides tutorials for your WRE2205 as follows: • Connecting a Wireless Client using WPS • Push Button Configuration (PBC) • PIN Configuration • Connecting the WRE2205 to an AP • Connecting to an AP with the WPS PBC Method • Connecting to an AP with the WPS PIN Method • Selecting an AP from an Automatically Detected List • Selecting an AP by Manually Entering Security Information 5.
Chapter 5 Tutorials 3 In the wireless client utility, find the WPS settings. Enable WPS and press the WPS button (Start or WPS button) 4 Log into WRE2205’s Web Configurator and navigate to the Network > Wireless LAN > WPS Station screen. 5 In the WRE2205’s Web Configurator, select Registrar in Config Mode and then press Start PBC. Note: Your WRE2205 has a WPS button located on its panel, as well as a Start PBC button in the Web Configurator.
Chapter 5 Tutorials 5.2.2 PIN Configuration When you use the PIN configuration method, you need to use both WRE2205’s configuration interface and the client’s utilities. 1 Launch your wireless client’s configuration utility. Go to the WPS settings and select the PIN method to get a PIN number. 2 On the WRE2205, navigate to the Network > Wireless LAN > WPS Station screen. 3 In the WRE2205’s Web Configurator, select Registrar in Config Mode.
Chapter 5 Tutorials Figure 17 Example WPS Process: PIN Method Wireless Client WRE2205 25327519 WITHIN 2 MINUTES Authentication by PIN SECURITY INFO COMMUNICATION 5.3 Connecting the WRE2205 to an AP This section gives you an example of how to connect the WRE2205 to an AP. There are four AP connection methods. This tutorial shows you how to use all of them. • Connecting to an AP with the WPS PBC method - create a secure wireless network simply by pressing a button. See Section 5.3.1 on page 33.
Chapter 5 Tutorials • Connecting to an AP with the WPS PIN method - create a secure wireless network simply by entering the WRE2205's PIN (Personal Identification Number) in the AP’s interface. See Section 5.3.2 on page 34. This is the more secure method, since one device can authenticate the other. • Selecting an AP from an Automatically Detected List - create a secure wireless network simply by selecting an AP from a list of detected APs. See Section 5.3.3 on page 35.This is the easier method.
Chapter 5 Tutorials Figure 18 Example Connection to AP using WPS: PBC Method WRE2205 AP WITHIN 2 MINUTES SECURITY INFO COMMUNICATION 5.3.2 Connecting to an AP with the WPS PIN Method When you use the PIN configuration method, you need to use both the configuration interface of the AP and the WRE2205’s configuration interface. 1 Log into WRE2205’s Web Configurator and navigate to the Network > Wireless LAN > WPS Station screen. Select Enrollee in Config Mode to get a PIN number.
Chapter 5 Tutorials Figure 19 Example Connection to AP using WPS: PIN Method WRE2205 AP 51382179 WITHIN 2 MINUTES Authentication by PIN SECURITY INFO COMMUNICATION 5.3.3 Selecting an AP from an Automatically Detected List Follow the steps below to create a secure wireless network by selecting an AP from a list of detected APs. The instructions require that your hardware is connected (see the Quick Start Guide) and you are logged into the Web Configurator through your LAN connection (see Section 2.
Chapter 5 Tutorials Figure 20 Tutorial: Selecting an automatically detected AP 2 Type a key into the KEY field and click Next. Figure 21 Tutorial: The KEY field 3 Wait for the WRE2205 to verify the key with the AP. Figure 22 Tutorial: Verifying the key 4 When the key is verified, click Next.
Chapter 5 Tutorials 5 Click APPLY to save settings and restart the WRE2205. Click CONTINUE to go to the Status screen without saving the settings and restarting the WRE2205. Figure 24 Tutorial: Saving settings 5.3.4 Selecting an AP by Manually Entering Security Information This example shows you how to configure wireless security settings with the following parameters on your WRE2205.
Chapter 5 Tutorials 3 Select the security settings and click Next. Figure 26 Tutorial: Security Settings 4 Click Apply to save settings and restart the WRE2205. Click CONTINUE to go to the Status screen without saving the settings and restarting the WRE2205.
P ART II Technical Reference 39
C HAPT ER 6 Wireless LAN 6.1 Overview This chapter discusses how to configure the wireless network settings in your WRE2205. See Section 1.1 on page 9 for an overview of wireless networks. 6.2 What You Can Do • Use the General screen to enable the Wireless LAN, enter the SSID and select the wireless security mode (Section 6.4 on page 43). • Use the MAC Filter screen to allow or deny wireless stations based on their MAC addresses from connecting to the WRE2205 (Section 6.5 on page 44).
Chapter 6 Wireless LAN 6.3.1 Wireless Security Overview The following sections introduce different types of wireless security you can set up in the wireless network. 6.3.1.1 MAC Address Filter Every wireless client has a unique identification number, called a MAC address.1 A MAC address is usually written using twelve hexadecimal characters2; for example, 00A0C5000002 or 00:A0:C5:00:00:02. To get the MAC address for each wireless client, see the appropriate User’s Guide or other documentation.
Chapter 6 Wireless LAN Many types of encryption use a key to protect the information in the wireless network. The longer the key, the stronger the encryption. Every wireless client in the wireless network must have the same key. 6.3.1.3 WPS WiFi Protected Setup (WPS) is an industry standard specification, defined by the WiFi Alliance. WPS allows you to quickly set up a wireless network with strong security, without having to configure security settings manually.
Chapter 6 Wireless LAN Table 12 Network > Wireless LAN > General (continued) LABEL DESCRIPTION Hide SSID Select this check box to hide the SSID in the outgoing beacon frame so a station cannot obtain the SSID through scanning using a site survey tool. Operating Channel This displays the channel the WRE2205 is currently using. Apply Click Apply to save your changes back to the WRE2205. Reset Click Reset to reload the previous configuration for this screen. 6.
Chapter 6 Wireless LAN The following table describes the labels in this menu. Table 13 Network > Wireless LAN > MAC Filter LABEL DESCRIPTION Active Select this to enable MAC address filtering. Set This is the index number of the MAC address. MAC Address Enter the MAC addresses of the wireless station that are allowed access to the WRE2205 in these address fields. Enter the MAC addresses in a valid MAC address format, that is, six hexadecimal character pairs, for example, 12:34:56:78:9a:bc.
Chapter 6 Wireless LAN Table 14 Network > Wireless LAN > Advanced (continued) LABEL DESCRIPTION Preamble Type A preamble affects the timing in your wireless network. There are two preamble modes: long and short. If a device uses a different preamble mode than the WRE2205 does, it cannot communicate with the WRE2205. Tx Power This field controls the transmission power of the WRE2205.
Chapter 6 Wireless LAN Figure 32 Network > Wireless LAN > WPS The following table describes the labels in this screen. Table 16 Network > Wireless LAN > WPS LABEL DESCRIPTION WPS Setup Enable WPS Select this to enable the WPS feature. PIN Number This displays a PIN number last time system generated. Click Generate to generate a new PIN number.
Chapter 6 Wireless LAN Figure 33 Network > Wireless LAN > WPS Station The following table describes the labels in this screen. Table 17 Network > Wireless LAN > WPS Station LABEL DESCRIPTION Config Mode Use this to select Registrar or Enrollee mode. Select Registrar mode to make wireless clients follow the wireless settings of the WRE2205. Select Enrollee mode to make the WRE2205 follow the wireless settings of an access point.
Chapter 6 Wireless LAN The following table describes the labels in this screen. Table 18 Network > Wireless LAN > AP Select LABEL DESCRIPTION Select Use the radio button to select the wireless device to which you want to connect. SSID This displays the Service Set IDentity of the wireless device. The SSID is a unique name that identifies a wireless network. All devices in a wireless network must use the same SSID. MAC This displays the MAC address of the wireless device.
Chapter 6 Wireless LAN 50 WRE2205 User’s Guide
C HAPT ER 7 LAN 7.1 Overview This screen allows you to assign the WRE2205 a fixed or dynamic IP address. The default IP address is 192.168.1.2. In initial configuration, the WRE2205 acts as a DHCP server, so it can assign your computer an IP address in the same network range as the default IP. After the WRE2205 connects to an AP, the DHCP server function is disabled and your computer gets its IP from the AP.
Chapter 7 LAN The following table describes the labels in this screen. Table 19 Network > LAN > IP 52 LABEL DESCRIPTION Get from DHCP Server Select this to have the WRE2205 get a dynamic IP address from a DHCP server. User Defined LAN IP Click this to enable the manual IP configuration. IP Address Type the IP address of your WRE2205 in dotted decimal notation 192.168.1.2 (factory default). IP Subnet Mask The subnet mask specifies the network number portion of an IP address.
C HAPT ER 8 System 8.1 Overview This chapter provides information on the System screen. 8.2 What You Can Do Use the Password screen to set the password (Section 8.3 on page 53). 8.3 System Password Screen Use this screen to set the web configurator password. Click Maintenance > System. The following screen displays. Figure 36 Maintenance > System > Password The following table describes the labels in this screen.
Chapter 8 System 54 WRE2205 User’s Guide
C HAPT ER 9 Tools 9.1 Overview This chapter shows you how to upload a new firmware, upload or save backup configuration files, restart the WRE2205 and configure LEDs. 9.2 What You Can Do • Use the Firmware screen to upload firmware to your WRE2205 (Section 9.3 on page 55). • Use the Configuration screen to view information related to factory defaults, backup configuration, and restore configuration (Section 9.4 on page 56). • Use the Restart screen to have the WRE2205 reboot (Section 9.5 on page 58).
Chapter 9 Tools Table 21 Maintenance > Tools > Firmware (continued) LABEL DESCRIPTION Browse... Click Browse... to find the .bin file you want to upload. Remember that you must decompress compressed (.zip) files before you can upload them. Upload Click Upload to begin the upload process. This process may take up to two minutes. Note: Do not turn off the WRE2205 while firmware upload is in progress! After you see the Firmware Upgrading screen, wait until the upgrade process is complete.
Chapter 9 Tools Figure 41 Maintenance > Tools > Configuration 9.4.1 Backup Configuration Backup configuration allows you to back up (save) the WRE2205’s current configuration to a file on your computer. Once your WRE2205 is configured and functioning properly, it is highly recommended that you back up your configuration file before making configuration changes. The backup configuration file will be useful in case you need to return to your previous settings.
Chapter 9 Tools Figure 42 Temporarily Disconnected If you uploaded the default configuration file you may need to change the IP address of your computer to be in the same subnet as that of the default WRE2205 IP address (192.168.1.2). See Appendix C on page 85 for details on how to set up your computer’s IP address. 9.4.
Chapter 9 Tools The following table describes the labels on the LED screen. Table 23 Maintenance > Tools > LED Screen LABEL DESCRIPTION Enable LED OFF mode Type in the location of the file you want to upload in this field or click Browse... to find it. Turn off all LED Select this to turn off all LEDs. Turn off all LED except POWER LED Select this to turn off all LEDs except the power LED. Apply Click Apply to save your changes back to the WRE2205.
Chapter 9 Tools 60 WRE2205 User’s Guide
C HAPTER 10 Troubleshooting This chapter offers some suggestions to solve problems you might encounter. The potential problems are divided into the following categories. • Power, Hardware Connections, and LEDs • WRE2205 Access and Login • Internet Access • Resetting the WRE2205 to Its Factory Defaults • Wireless Problems 10.1 Power, Hardware Connections, and LEDs The WRE2205 does not turn on. None of the LEDs turn on. 1 Make sure you are using the power adaptor or cord included with the WRE2205.
Chapter 10 Troubleshooting 10.2 WRE2205 Access and Login I don’t know the IP address of my WRE2205. 1 Click Start > Run, enter cmd, and then enter Ping zyxelsetupxxxx, where xxxx is the last four digits of the MAC address of the WRE2205. You can find the MAC address on a label on the WRE2205. 2 The default IP address is 192.168.1.2. 3 If you changed the IP address and have forgotten it, you might get the IP address of the WRE2205 by looking up the IP address of the default gateway for your computer.
Chapter 10 Troubleshooting • If you changed the IP address and have forgotten it, see the troubleshooting suggestions for I don’t know the IP address of my WRE2205. 2 Check the hardware connections, and make sure the LEDs are behaving as expected. See the Quick Start Guide. 3 Make sure your Internet browser does not block pop-up windows and has JavaScript and Java enabled. 4 Make sure your computer is in the same subnet as the WRE2205.
Chapter 10 Troubleshooting 2 Try to connect directly to the AP. If you can access the Internet, check that the WRE2205 has associated with the AP by checking the WLAN STA Information SSID field shows the SSID of the AP. See Section 6.4 on page 43. 3 If you are trying to access the Internet wirelessly, make sure the wireless settings in the wireless client are the same as the settings in the AP. 4 Disconnect all the cables from your device, and follow the directions in the Quick Start Guide again.
Chapter 10 Troubleshooting 10.4 Resetting the WRE2205 to Its Factory Defaults If you reset the WRE2205, you lose all of the changes you have made. The WRE2205 re-loads its default settings, and the username/password resets to admin/1234. You have to make all of your changes again. You will lose all of your changes when you reset the WRE2205 to its factory defaults. To reset the WRE2205, 1 Make sure the power LED is on.
Chapter 10 Troubleshooting 66 WRE2205 User’s Guide
A PPENDIX A Legal Information Copyright Copyright © 2012 by ZyXEL Communications Corporation. The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated into any language, or transmitted in any form or by any means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written permission of ZyXEL Communications Corporation. Published by ZyXEL Communications Corporation.
Appendix A Legal Information This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada. Viewing Certifications Go to http://www.zyxel.com to view this product’s documentation and certifications. ZyXEL Limited Warranty ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in material or workmanship for a specific period (the Warranty Period) from the date of purchase.
Appendix A Legal Information [Hungarian] Alulírott, ZyXEL nyilatkozom, hogy a berendezés megfelel a vonatkozó alapvetõ követelményeknek és az 1999/5/EK irányelv egyéb elõírásainak. [Polish] Niniejszym ZyXEL oświadcza, że sprzęt jest zgodny z zasadniczymi wymogami oraz pozostałymi stosownymi postanowieniami Dyrektywy 1999/5/EC. [Portuguese] ZyXEL declara que este equipamento está conforme com os requisitos essenciais e outras disposições da Directiva 1999/5/EC.
Appendix A Legal Information Pour la bande 2.4 GHz, la puissance est limitée à 10 mW en p.i.r.e. pour les équipements utilisés en extérieur dans la bande 2454 2483.5 MHz. Il n'y a pas de restrictions pour des utilisations en intérieur ou dans d'autres parties de la bande 2.4 GHz. Consultez http:// www.arcep.fr/ pour de plus amples détails. R&TTE 1999/5/EC WLAN 2.4 – 2.4835 GHz IEEE 802.11 b/g/n Location Frequency Range(GHz) Power (EIRP) Indoor (No restrictions) 2.4 – 2.4835 100mW (20dBm) Outdoor 2.
Appendix A Legal Information • • • • • • • • • Connect the power adaptor or cord to the right supply voltage (for example, 110V AC in North America or 230V AC in Europe). Do NOT allow anything to rest on the power adaptor or cord and do NOT place the product where anyone can walk on the power adaptor or cord. Do NOT use the device if the power adaptor or cord is damaged as it might cause electrocution. If the power adaptor or cord is damaged, remove it from the power outlet.
Appendix A Legal Information 72 WRE2205 User’s Guide
Index Index B firmware version 24 Backup configuration 57 G C certifications notices 67 viewing 68 Channel 24 Configuration backup 57 reset the factory defaults 58 restore 57 copyright 67 CPU usage 24 General wireless LAN screen 43 Guide Quick Start 2 I IP Address 16, 52 L LAN setup 51 D disclaimer 67 documentation related 2 duplex setting 24 Link type 24 M MAC 44 MAC address 42 MAC address filter 42 E encryption 42 key 43 MAC address filtering 44 MAC filter 44 managing the device good habits 10
Index O W other documentation 2 warranty 68 note 68 overview 9 P port speed 24 product registration 68 Web Configurator how to access 13 Overview 13 Wireless association list 25 wireless channel 65 wireless LAN 65 Wireless LAN wizard 16 Quick Start Guide 2 Wireless network basic guidelines 41 encryption 42 MAC address filter 42 security 41 SSID 41 R Wireless security 41 overview 42 troubleshooting 65 type 42 Q Quality of Service (QoS) 46 registration product 68 Wireless tutorial 29 WPS 29 Res
Index WRE2205 User’s Guide 75
Index 76 WRE2205 User’s Guide