1 Wireless LAN Controller Web Authentication Configuration Example Document ID: Contents Introduction Prerequisites Requirements Components Used Conventions Web Authentication Web Authentication Process Network Setup Configure the Controller for Web Authentication Create a VLAN Interface Configure WLC for Internal Web Authentication Add a WLAN Instance Three Ways to Authenticate Users in Web Authentication Configure Your WLAN Client to Use Web Authentication Client Configuration Client Login Troubleshoot Web authentication Troubleshoot ACS Web Auth with IPv6 Bridging Related Information Introduction This document explains how Cisco implements web authentication and shows how to configure a Cisco 4400 Series Wireless LAN (WLAN) Controller (WLC) to support an Internal web authentication. Prerequisites Requirements This document assumes that you already have an initial configuration on the 4400 WLC. Components Used The information in this document is based on these software and hardware versions: A 4400 series WLC that runs version Cisco Secure Access Control Server (ACS) version 4.2 installed on a Microsoft Windows 2003 Server Cisco Aironet 1131AG Series Light Weight Access Point Cisco Aironet a/b/g CardBus Wireless Adapter that runs version 4.0 The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure
2 that you understand the potential impact of any command. Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Web Authentication Web authentication is a Layer 3 security feature that causes the controller to not allow IP traffic (except DHCP and DNS related packets) from a particular client until that client has correctly supplied a valid username and password. It is a simple Authentication method without the need for a supplicant or client utility. Web authentication is typically used by customers who want to deploy a guest access network. Typical deployments can include "hot spot" locations such as T Mobile or Starbucks. Keep in mind that web authentication does not provide data encryption. Web authentication is typically used as simple guest access for either a "hot spot" or campus atmosphere where the only concern is the connectivity. Web authentication can be performed using: Default login window on the WLC Modified version of the default login window on the WLC A customized login window that you configure on an external web server (External web authentication) A customized login window that you download to the controller In this document, the Wireless LAN Controller for Internal web authentication is configured. Web Authentication Process This is what occurs when a user connects to a WLAN configured for web authentication: The user opens a web browser and enters a URL, for example, The client sends out a DNS request for this URL to get the IP for the destination. The WLC bypasses the DNS request to the DNS server and the DNS server responds back with a DNS reply, which contains the IP address of the destination This, in turn, is forwarded to the wireless clients. The client then tries to open a TCP connection with the destination IP address. It sends out a TCP SYN packet destined to the IP address of The WLC has rules configured for the client and hence can act as a proxy for It sends back a TCP SYN ACK packet to the client with source as the IP address of The client sends back a TCP ACK packet in order to complete the three way TCP handshake and the TCP connection is fully established. The client sends an HTTP GET packet destined to The WLC intercepts this packet and sends it for redirection handling. The HTTP application gateway prepares a HTML body and sends it back as the reply to the HTTP GET requested by the client. This HTML makes the client go to the default webpage URL of the WLC, for example, Server IP>/login.html. The client closes the TCP connection with the IP address, for example, Now the client wants to go to Therefore, the client tries to open a TCP connection with the virtual IP address of the WLC. It sends a TCP SYN packet for to the WLC. The WLC responds back with a TCP SYN ACK and the client sends back a TCP ACK to the WLC in order to complete the handshake. The client sends a HTTP GET for /login.html destined to in order to request for the login page.
3 This request is allowed up to the Web Server of the WLC, and the server responds back with the default login page. The client receives the login page on the browser window where the user can go ahead and log in. Here is a link to a video on the Cisco Support Community process: which explains the Web Authentication Web Authentication on Cisco Wireless LAN Controllers (WLCs) Network Setup This document uses this network setup:
4 Configure the Controller for Web Authentication In this document, a WLAN is configured for web authentication and mapped to a dedicated VLAN. These are the steps involved to configure a WLAN for web authentication: Create a VLAN Interface Configure WLC for Internal Web Authentication Add a WLAN Instance Configure Authentication Type (Three Ways to Authenticate Users in Web Authentication) In this section, you are presented with the information to configure the controller for web authentication. These are the IP addresses used in this document: The IP address of the WLC is The IP address of the ACS server is Create a VLAN Interface Complete these steps: 1. From the Wireless LAN controller GUI, choose Controller from the menu at the top, choose Interfaces from the menu on the left, and click New on the upper right side of the window to create a new dynamic interface. The Interfaces > New window appears. This example uses Interface Name vlan90 with a VLAN ID
5 of 90: 2. Click Apply in order to create the VLAN interface. The Interfaces > Edit window appears that asks you to fill interface specific information. 3. This document uses these parameters: IP Address Netmask (24 bits) Gateway Port Number Primary DHCP Server Note: This parameter should be the IP address of your RADIUS or DHCP server. In this example, the management address of the WLC is used as the DHCP server because the Internal DHCP scope is configured on the WLC. Secondary DHCP Server Note: The example does not have a secondary DHCP server, so uses If your configuration has a secondary DHCP server, add the server IP address in this field. ACL NameNone
6 4. Click Apply in order to save the changes. Configure WLC for Internal Web Authentication The next step is to configure the WLC for the Internal web authentication. Internal web authentication is the default web authentication type on WLCs. If this parameter has not been changed, no configuration is required to enable Internal web authentication. If the web authentication parameter was changed previously, complete these steps to configure the WLC for Internal web authentication: 1. From the controller GUI, choose Security > Web Auth > Web Login Page in order to access the Web Login Page. 2. From the Web Authentication Type drop down box, choose Internal Web Authentication. 3. In the Redirect URL after login field, enter the URL of the page to which the end user will be redirected to after successful authentication.
7 Note: In WLC versions 5.0 and later, the logout page for web authentication can also be customized. Refer to the Assign Login, Login failure and Logout pages per WLAN section of Wireless LAN Controller Configuration Guide,5.2 for more information on how to configure it. Add a WLAN Instance Now that Internal web authentication has been enabled and there is a VLAN interface dedicated for web authentication, you must provide a new WLAN/SSID in order to support the web authentication users. Complete these steps in order to create a new WLAN/SSID: 1. From the WLC GUI, click WLAN in the menu at the top, and click New on the upper right side. Choose WLAN as the Type. Choose a profile name and WLAN SSID for Web authentication. This example uses Guest for both the Profile Name and WLAN SSID. 2. Click Apply.
8 A new WLANs > Edit window appears. 3. Check the status box of the WLAN in order to enable the WLAN. From the Interface menu, select the name of the VLAN interface that you created previously. In this example, the Interface Name is vlan90. Note: Leave the default value for other parameters on this screen. 4. Click the Security tab. Complete these steps in order to configure web authentication: a. Click the Layer 2 tab and set the security to None. Note: You cannot configure web passthrough as Layer 3 security with 802.1x or WPA/WPA2 as Layer 2 Security for a WLAN. Refer to Wireless LAN Controller Layer 2 Layer 3 Security Compatibility Matrix for more information on the Wireless LAN Controller Layer 2 and Layer 3 security compatibility. b. Click the Layer 3 tab. Check the Web Policy box and choose the Authentication option, as shown here:
9 c. Click Apply in order to save the WLAN. d. You are returned to the WLAN summary window. Make sure that the Web Auth is enabled under the Security Policies column of the WLAN table for the SSID Guest. Three Ways to Authenticate Users in Web Authentication There are three ways to authenticate users when you use web authentication. Local authentication allows you to authenticate the user in the Cisco WLC. You can also use an external RADIUS server or a LDAP server as a backend database in order to authenticate the users. This document provides an example configuration for all three methods. Local Authentication The user database for the guest users are stored on the WLC's local database. Users are authenticated by the WLC against this database. 1. From the WLC GUI, choose Security. 2. Click Local Net Users from the AAA menu on the left.
10 3. Click New in order to create a new user. A new window displays that asks for username and password information. 4. Enter a User Name and Password in order to create a new user, then confirm the password that you want to use. This example creates the user named User1. 5. Add a description, if you choose. This example uses Guest User1. 6. Click Apply in order to save the new user configuration.
11 7. Repeat steps 3 6 to add more users to the database. RADIUS Server for Web Authentication This document uses a wireless ACS on Windows 2003 Server as the RADIUS server. You can use any available RADIUS server that you currently deploy in your network. Note: ACS can be set up on either Windows NT or Windows 2000 Server. In order to download ACS from Cisco.com, refer to Software Center (Downloads) Cisco Secure Software (registered customers only). You need a Cisco web account in order to download the software. The Set Up ACS section shows you how to configure ACS for RADIUS. You must have a fully functional network with a Domain Name System (DNS) and a RADIUS server. Set Up ACS In this section, you are presented with the information to set up ACS for RADIUS. Set up ACS on your server and then complete these steps in order to create a user for authentication: 1. When ACS asks if you want to open ACS in a browser window to configure, click yes. Note: After you set up ACS, you also have an icon on your desktop. 2. In the menu on the left, click User Setup. This action takes you to User Setup screen as shown here:
12 3. Enter the user that you want to use for web authentication, and click Add/Edit. After the user is created, a second window opens as shown here:
13 4. Ensure that the Account Disabled Box at the top is not checked. 5. Choose ACS Internal Database for the Password Authentication option. 6. Enter the password. Admin has an option to configure PAP/CHAP or MD5 CHAP authentication while adding a user in the ACS internal database. PAP is the default authentication type for web auth users on controllers. Admin has the flexibility to change the authentication method to chap/md5 chap using this CLI command: config custom web radiusauth <auth method> 7. Click Submit. Enter Your RADIUS Server Information into the Cisco WLC Complete these steps: 1. Click Security in the menu at the top. 2. Click RADIUS Authentication in the menu on the left. 3. Click New, and enter the IP address of your ACS/RADIUS server. In this example, the IP address of the ACS server is Enter the shared secret for the RADIUS server. Make sure that this secret key is the same as the one you entered in the RADIUS server for the WLC. 5. Leave the Port number at the default, Ensure that the Server Status option is Enabled. 7. Check the Network User Enable box so that this RADIUS Server is used for authenticating users of your wireless network. 8. Click Apply. Make sure that the Network User box is checked and Admin Status is Enabled.
14 Configuring WLAN with RADIUS Server Now that the RADIUS server is configured on the WLC, you need to configure the WLAN to use this RADIUS server for web authentication. Complete these steps in order to configure WLAN with the RADIUS server. 1. Open your WLC browser and click WLANs. This displays the list of WLANs configured on the WLC. Click the WLAN Guest which was created for web authentication. 2. On the WLANs > Edit page click the Security Menu. Click the AAA Servers tab under Security. Then, choose the RADIUS server which is in this example: 3. Click Apply. Verify ACS When you set up the ACS, remember to download all the current patches and latest code. This should solve impending issues. In case you are using RADIUS Authentication make sure that your WLC is listed as one of the AAA Clients. Click the Network Configuration menu on the left hand side to check this. Click the AAA client, then verify the password and the authentication type configured. Refer to the Configuring AAA Clients section of User Guide for Cisco Secure Access Control Server 4.2 for more information on how to configure an AAA client.
15 When you choose User Setup, verify again that your users actually exist. Click List All Users. A window as shown appears. Make sure the user that has been created exists in the list.
16 LDAP Server This section explains how to configure a Lightweight Directory Access Protocol (LDAP) server as a backend database, similar to a RADIUS or local user database. An LDAP backend database allows the controller to query an LDAP server for the credentials (username and password) of a particular user. These credentials are then used to authenticate the user. Complete these steps to configure LDAP using the controller GUI: 1. Click Security > AAA > LDAP in order to open the LDAP Servers. This page lists any LDAP servers that have already been configured. If you want to delete an existing LDAP server, move your cursor over the blue drop down arrow for that server and choose Remove. If you want to make sure that the controller can reach a particular server, hover your cursor over the blue drop down arrow for that server and choose Ping. 2. Perform one of the following: To edit an existing LDAP server, click the index number for that server. The LDAP Servers > Edit page appears. To add an LDAP server, click New. The LDAP Servers > New page appears. 3. If you are adding a new server, choose a number from the Server Index (Priority) drop down box to specify the priority order of this server in relation to any other configured LDAP servers. You can configure up to seventeen servers. If the controller cannot reach the first server, then it tries the second one from the list and so on. 4. If you are adding a new server, enter the IP address of the LDAP server in the Server IP Address field. 5. If you are adding a new server, enter the LDAP server's TCP port number in the Port Number field. The valid range is 1 to 65535, and the default value is Check the Enable Server Status check box to enable this LDAP server, or uncheck it to disable it. The default value is disabled. 7. From the Simple Bind drop down box, choose Anonymous or Authenticated to specify the local authentication bind method for the LDAP server. The Anonymous method allows anonymous access to the LDAP server, whereas the Authenticated method requires that a username and password be entered to secure access. The default value is Anonymous. 8. If you chose Authenticated in Step 7, complete these steps:
17 a. In the Bind Username field, enter a username to be used for local authentication to the LDAP server. b. In the Bind Password and Confirm Bind Password fields, enter a password to be used for local authentication to the LDAP server. 9. In the User Base DN field, enter the distinguished name (DN) of the subtree in the LDAP server that contains a list of all the users. For example, ou=organizational unit,.ou=next organizational unit, and o=corporation.com. If the tree containing users is the base DN, type o=corporation.com or dc=corporation, dc=com. 10. In the User Attribute field, enter the name of the attribute in the user record that contains the username. You can obtain this attribute from your directory server. 11. In the User Object Type field, enter the value of the LDAP objecttype attribute that identifies the record as a user. Often, user records have several values for the objecttype attribute, some of which are unique to the user and some of which are shared with other object types. 12. In the Server Timeout field, enter the number of seconds between re transmissions. The valid range is 2 to 30 seconds, and the default value is 2 seconds. 13. Click Apply to commit your changes. 14. Click Save Configuration to save your changes. 15. Complete these steps if you wish to assign specific LDAP servers to a WLAN: a. Click WLANs to open the WLANs page. b. Click the ID number of the desired WLAN. c. When the WLANs > Edit page appears, click the Security > AAA Servers tabs to open the WLANs > Edit (Security > AAA Servers) page. d. From the LDAP Servers drop down boxes, choose the LDAP server(s) that you want to use with this WLAN. You can choose up to three LDAP servers, which are tried in priority order. e. Click Apply to commit your changes. f. Click Save Configuration to save your changes. Configure Your WLAN Client to Use Web Authentication Once the WLC is configured, the client must be configured appropriately for web authentication. In this section, you are presented with the information to configure your Windows system for web authentication. Client Configuration The Microsoft wireless client configuration remains mostly unchanged for this subscriber. You only need to add the appropriate WLAN/SSID configuration information. Complete these steps:
18 1. From the Windows Start menu, choose Settings > Control Panel > Network and Internet Connections. 2. Click the Network Connections icon. 3. Right click the LAN Connection icon and choose Disable. 4. Right click the Wireless Connection icon and choose Enable. 5. Right click the Wireless Connection icon again and choose Properties. 6. From the Wireless Network Connection Properties window, click the Wireless Networks tab. 7. Under the preferred networks, area click Add in order to configure the Web authentication SSID. 8. Under the Association tab, enter the Network Name (WLAN/SSID) value that you want to use for web authentication. Note: The Data Encryption is Wired Equivalent Privacy (WEP) by default. Disable Data Encryption in order for web authentication to work. 9. Click OK at the bottom of the window in order to save the configuration. When you communicate with the WLAN, you see a beacon icon in the Preferred Network box. This shows a successful wireless connection to web authentication. The WLC has provided your wireless Windows client with an IP address.
19 Note: If your wireless client is also a VPN end point and you have web authentication configured as a security feature for WLAN, then the VPN tunnel is not established until you go through the web authentication process explained here. In order to establish a VPN tunnel, the client must first go through the process of web authentication with success. Only then does VPN tunneling become successful. Note: After a successful login, if the wireless clients are idle and do not communicate with any of the other devices, the client is de authenticated after an idle timeout period. The timeout period is 300 seconds by default and can be changed using this CLI command: config network usertimeout <seconds>. When this occurs, client entry is removed from the controller. If the client associates again, it will move back to a Webauth_Reqd state. Note: If clients are active after successful login, they will get de authenticated and entry can still be removed from the controller after the session timeout period configured on that WLAN (for example,1800 seconds by default and can be changed using this CLI command: config wlan session timeout <WLAN ID> <seconds>). When this occurs, client entry is removed from the controller. If the client associates again, it will move back in a Webauth_Reqd state. If clients are in Webauth_Reqd state, no matter if they are active or idle, the clients will get de authenticated after a web auth required timeout period (for example, 300 seconds and this time is non user configurable). All traffic from the client (allowed via Pre Auth ACL) will be disrupted. If the client associates again, it will move back to the Webauth_Reqd state. Client Login Complete these steps: 1. Open a browser window and enter any URL or IP Address. This brings the web authentication page to the client. If the controller is running any release earlier than 3.0, the user has to enter https:// /login.html to bring up the web authentication page. A security alert window displays. 2. Click Yes in order to proceed. 3. When the Login window appears, enter the username and password of the Local Net User that you created.
20 If your login is successful, you see two browser windows. The larger window indicates successful login and you can this window to browse the internet. Use the smaller window in order to log out when your use of the guest network is complete. The screenshot shows a successful redirect for web authentication. The next screenshot shows the Login Successful window, which displays when authentication has occurred. Cisco 4404/WiSM controllers can support 125 simultaneous Web Auth Users logins, and scale up to 5000 web auth clients. Cisco 5500 controllers can support 150 simultaneous Web Auth Users logins. Troubleshoot Web authentication Troubleshoot ACS If you have issues with password authentication, click Reports and Activity on the lower left side of the ACS in order to open all available reports. After you open the reports window, you have the option to open
21 RADIUS Accounting, Failed Attempts for login, Passed Authentications, Logged in Users, and other reports. These reports are.csv files, and you can open the files locally on your machine. The reports help uncover issues with authentication, such as incorrect user name and/or password. ACS also comes with online documentation. If you are not connected to a live network and have not defined the service port, ACS uses the IP address of your Ethernet port for your service port. If your network is not connected, you most likely end up with the Windows x.x default IP address. Note: If you type in any external URL, the WLC automatically connects you to the internal web authentication page. If the automatic connection does not work, you can enter the management IP address of the WLC in the URL bar in order to troubleshoot. Look at the top of the browser for the message that says to redirect for web authentication. Refer to Troubleshooting Web Authentication on a Wireless LAN Controller (WLC) for more information on troubleshooting web authentication. Web Auth with IPv6 Bridging In order to configure a WLAN for IPv6 bridging, from the controller GUI, navigate to WLANs. Then, select the desired WLAN and choose Advanced from the WLANs > Edit page. Select the IPv6 Enable check box if you want to enable clients that connect to this WLAN to accept IPv6 packets. Otherwise, leave the check box unselected, which is the default value. If you disable (or uncheck) the IPv6 check box, IPv6 will only be allowed after authentication. Enabling IPv6 means that the controller can pass IPv6 traffic without client authentication.
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1. APPLE AIRPORT EXTREME 1.1 Product Description The following are device specific configuration settings for the Apple Airport Extreme. Navigation through the management screens will be similar but may
Avaya Video Conferencing Manager Deployment Guide August 2011 Avaya Video Conferencing Manager Deployment Guide 2 Avaya Video Conferencing Manager This guide is for network administrators who use Avaya
Configuring Cisco CallManager IP Phones to Work With IP Phone Agent Document ID: 40564 Contents Introduction Prerequisites Requirements Components Used Conventions Configuration Procedures in Cisco CallManager
How to Configure Captive Portal Captive portal is one of the user identification methods available on the Palo Alto Networks firewall. Unknown users sending HTTP or HTTPS 1 traffic will be authenticated,
Topology Objectives Part 1: Prepare Wireshark to Capture Packets Select an appropriate NIC interface to capture packets. Part 2: Capture, Locate, and Examine Packets Capture a web session to www.google.com.
A P P L I C A T I O N N O T E Creating a Gateway to Client VPN between Sidewinder G2 and a Mac OS X Client This application note describes how to set up a VPN connection between a Mac client and a Sidewinder
Cisco EXAM - 300-208 Implementing Cisco Secure Access Solutions (SISAS) Buy Full Product http://www.examskey.com/300-208.html Examskey Cisco 300-208 exam demo product is here for you to test the quality
KRAMER ELECTRONICS LTD. USER GUIDE Ethernet Configuration Guide (Lantronix) P/N: 2900-300321 Rev 6 Contents 1 Connecting to the Kramer Device via the Ethernet Port 1 1.1 Connecting the Ethernet Port Directly
Preparing for GO!Enterprise MDM On-Demand Service This guide provides information on...... An overview of GO!Enterprise MDM... Preparing your environment for GO!Enterprise MDM On-Demand... Firewall rules
AlienVault Unified Security Management (USM) 4.x-5.x User Management Guide USM v4.x-5.x User Management Guide, rev 1 Copyright 2015 AlienVault, Inc. All rights reserved. The AlienVault Logo, AlienVault,
VPN Overview The path for wireless VPN users First, the user's computer (the blue computer) connects to an access point in the uiuc-wireless-net network and is assigned an IP address in that range (172.21.0.0
APPENDIXC Reference and Troubleshooting: FTP, IIS, and Firewall Information Although Cisco VXC Manager automatically installs and configures everything you need for use with respect to FTP, IIS, and the
Intel Active Management Technology with System Defense Feature Quick Start Guide Introduction...3 Basic Functions... 3 System Requirements... 3 Configuring the Client System...4 Intel Management Engine
Overview Interlink Networks Secure.XS and Cisco Wireless Deployment Guide (An AVVID certification required document) This document is intended to serve as a guideline to setup Interlink Networks Secure.XS
Hub telecom Wifi Hotspots User guide User support If you're still having trouble connecting to the portal after reading this guide, thank you for contacting customer support on +33 805 46 94 34 (free call
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