This document provides information on the most frequently asked
questions (FAQs) about the Wireless Guest Access feature, which is a part of
the Cisco Unified Wireless network.
Technical Tips Conventions for more information on document
What is an Ethernet over IP (EoIP) tunnel to the unsecured network
A. Cisco recommends the use of a controller dedicated to guest traffic.
This controller is known as the guest anchor controller.
The guest anchor controller is usually located in an unsecured network
area, often called the demilitarized zone (DMZ). Other internal WLAN
controllers from where the traffic originates are located in the enterprise
LAN. An EoIP tunnel is established between the internal WLAN controllers and
the guest anchor controller in order to ensure path isolation of guest traffic
from enterprise data traffic. Path isolation is a critical security management
feature for guest access. It ensures that security and quality of service (QoS)
policies can be separate, and are differentiated between guest traffic and
corporate or internal traffic.
An important feature of the Cisco Unified Wireless Network architecture
is the ability to use an EoIP tunnel to statically map one or more provisioned
WLANs (that is, SSIDs) to a specific guest anchor controller within the
network. All traffic—both to and from a mapped WLAN—traverses a static EoIP
tunnel that is established between a remote controller and the guest anchor
Using this technique, all associated guest traffic can be transported
transparently across the enterprise network to a guest anchor controller that
resides in the unsecured network area.
How do I select the right controller to deploy as a guest anchor
A. The selection of the guest anchor controller is a function of the
amount of guest traffic as defined by the number of active guest client
sessions, or as defined by the uplink interface capacity on the controller, or
Total throughput and client limitations per guest anchor controller are
Cisco 2504 Wireless LAN Controller – 4 * 1 Gbps interfaces and 1000
Cisco 5508 Wireless LAN Controller (WLC) – 8 Gbps and 7,000 guest
Cisco Catalyst 6500 Series Wireless Services Module (WiSM-2) – 20
Gbps and 15,000 clients
Cisco 7500 Wireless LAN Controller (WLC) – 10 Gbps and 20,000
Note: Cisco 7500 WLCs cannot be configured as a guest anchor controller.
Refer to What controllers can be used to support guest
access in the unsecured network area? for the list of WLCs that support
guest anchor function.
A maximum of 2048 guest usernames and passwords can be stored on each
controller’s database. Therefore, if the total number of active guest
credentials is in excess of this number, more than one controller will be
needed. Alternatively, guest credentials can be stored in an external RADIUS
The number of access points in the network does not impact the
selection of the guest anchor controller.
How many Ethernet over IP (EoIP) tunnels can be terminated on a guest
A. One guest anchor controller can terminate up to 71 EoIP tunnels from
internal WLAN controllers. This capacity is the same across any model of the
Cisco Wireless LAN Controller except WLC- 2504. The 2504 controller can
terminate up to 15 EoIP tunnels. More than one guest anchor controller can be
configured if additional tunnels are required.
EoIP tunnels are counted per WLAN controller, independently of the
number of tunneled WLANs or Secure Set Identifiers (SSIDs) in each EoIP.
One EoIP tunnel is configured between the guest anchor controller and
each internal controller that supports access points with guest client
Can I create Ethernet over IP (EoIP) tunnels between controllers that run
different software versions?
A. Not all Wireless LAN Controller software versions support this. In such
cases the remote and anchor controller should run the same version of WLC
software. However, the recent software versions do allow the remote and anchor
controllers to have different versions.
This matrix lists the Wireless LAN Controller software versions with
which you can create the EoIP tunnels.
Can the Cisco 2100/2500 Series Wireless LAN Controller be used as a guest
anchor controller in the unsecured network area?
A. Yes, starting Cisco Unified Wireless Network Software Release 7.4, the
Cisco 2500 Series Wireless LAN Controller can terminate (up to 15 EoIP tunnels)
guest traffic outside the firewall. The Cisco 2000 Series Wireless LAN
Controller can only originate guest tunnels.
Can the Cisco Wireless LAN Controller Module for Integrated Services
Routers (WLCM or WLCM2) be used as a guest anchor controller in the unsecured
A. No, the WLCM or WLCM2 cannot terminate guest tunnels. The WLCM can only
originate guest tunnels.
What controllers can be used to support guest access in the unsecured
A. The guest tunnel anchor function, which includes EoIP tunnel
termination, Web authentication, and access control of guest clients, is
supported in these Cisco Wireless LAN Controller platforms with Version 4.0 or
later software images:
Cisco Catalyst 6500 Series Wireless Services Module
Cisco WiSM-2 Series Wireless LAN Controller
Cisco Catalyst 3750G Integrated Wireless LAN
Cisco 5508 Series Wireless LAN Controller
Cisco 2500 Series Wireless LAN Controller (support introduced in
Software Release 7.4)
If a guest anchor controller is used outside the firewall, what firewall
ports are open for guest access to work?
A. On any firewall between the guest anchor controller and the remote
controllers, these ports need to be open:
For optional management, these firewall ports need to be open:
SSH/Telnet—TCP Port 22/23
TFTP—UDP Port 69
NTP—UDP Port 123
SNMP—UDP Ports 161 (gets and sets) and 162 (traps)
HTTPS/HTTP—TCP Port 443/80
Syslog—TCP Port 514
RADIUS Auth/Account UDP Port 1812 and
Can guest traffic pass through a firewall with Network Address
Translation (NAT) configured?
A. One to one NAT must be used on the EoIP tunnel going through a
In an Anchor - Foreign WLC scenario, which WLC sends out the RADIUS
A. In this scenario, authentication is always done by the anchor WLC.
Therefore, RADIUS accounting is sent by the anchor WLC.
The guest tunnel between the internal controller and anchor controller
fails. I see these logs in the WLC: mm_listen.c:5373
MM-3-INVALID_PKT_RECVD: Received an invalid packet from 10. 40.220.18. Source
member:0.0.0.0. source member unknown.. Why?
A. You check the status of the tunnel from the WLC GUI on the
WLANs page. Click on the drop-down box near a WLAN and choose
Mobility Anchors which contains the status of control and data
path. The error message is seen due to one of these reasons:
Anchor and internal controllers are on different versions of code.
Make sure they run same versions of the code.
Misconfigurations in the mobility anchor configuration. Check that
the DMZ is configured itself as the Mobility anchor and the internal WLCs have
the DMZ WLC configured as the Mobility anchor. For more information on how to
configure the Mobility anchor, refer to the
Auto- Anchor Mobility section of
Wireless LAN Controller Configuration Guide, Release 7.0. This would
result in guest users unable to pass the traffic.
In a Wireless guest access setup, clients do not receive the IP address
from the DHCP Server. The Thu Jan 22 16:39:09 2009:
XX:XX:XX:XX:XX:XX DHCP dropping REPLY from Export-Foreign STA
error message appears on the Internal controller. Why?
A. In a Wireless guest access setup, the DHCP proxy setting in the Guest
Anchor controllers and the internal controller must match. Else, DHCP request
from clients are dropped and you see this error message on the internal
Thu Jan 22 16:39:09 2009: XX:XX:XX:XX:XX:XX DHCP dropping REPLY from Export-Foreign STA
Use this command in order to change the dhcp proxy setting on the
(Cisco Controller) >config dhcp proxy ?
enable Enable DHCP processing's proxy style behaviour.
disable Disable DHCP processing's proxy style behaviour.
Use the show dhcp proxy command on both
controllers in order to verify that both controllers have the same DHCP proxy
(Cisco Controller) >show dhcp proxy
DHCP Proxy Behaviour: enabled
(Cisco Controller) >
If guest traffic is tunneled to the unsecured network area, where do
guest clients get an IP address?
A. Guest traffic is transported within the enterprise at Layer 3 via EoIP.
Therefore, the first point at which Dynamic Host Configuration Protocol (DHCP)
services can be implemented is locally on the guest anchor controller, or the
guest anchor controller can relay client DHCP requests to an external server.
This is also the method by which Domain Name System (DNS) address resolution is
Does the Cisco Wireless LAN Controller support web portals for guest
A. Cisco Wireless LAN Controllers, software Version 3.2 or later, provide
a built-in web portal that captures guest credentials for authentication and
offers simple branding capabilities, along with the ability to display
disclaimer and acceptable use policy information.
How do I customize the web portal?
A. For information on how to customize a web portal, refer to
the Web Authentication Login Page.
How are guest credentials managed?
A. Guest credentials can be created and managed centrally using the Cisco
Wireless Control System (WCS) Version 7.0 and or Network Control System (NCS)
ver 1.0. A network administrator can establish a limited-privilege
administrative account within WCS that permits “lobby ambassador” access for
the purpose of creating guest credentials. In WCS or NCS, the person with a
lobby ambassador account is able to create, assign, monitor, and delete guest
credentials for the controller serving as a guest anchor controller.
The lobby ambassador can enter the guest username (or user ID) and
password, or the credentials can be autogenerated. There is also a global
configuration parameter that enables the use of one username and password for
all guests, or a unique username and password for each guest.
In order to configure the lobby ambassador account on the WCS, refer to
Guest User Accounts section of
Wireless Control System Configuration Guide, Release 7.0.
Is the lobby ambassador function available in the Cisco Wireless LAN
Controller in addition to the Wireless Control System (WCS) or
A. Yes. If the WCS or NCS is not deployed, a network administrator can
establish a lobby ambassador account on the guest anchor controller. A person
who logs into the guest anchor controller using the lobby ambassador account
will have access only to guest user management functions.
If there are multiple guest anchor controllers, a WCS or NCS must be
used to simultaneously configure usernames on multiple guest anchor
For information on how to create lobby ambassador accounts using
Wireless LAN Controllers, refer to the
a Lobby Ambassador Account section of
Wireless LAN Controller Configuration Guide, Release 7.0.
Can guests be authenticated with an external authentication,
authorization, and accounting (AAA) server?
A. Yes. Guest authentication requests can be relayed to an external RADIUS
What occurs when a guest logs on?
A. When a wireless guest logs in through the web portal, the guest anchor
controller handles the authentication by performing these steps:
The guest anchor controller checks its local database for username
and password, and if they are present, grants access.
If no user credentials are present locally on the guest anchor
controller, the guest anchor controller checks WLAN configuration settings to
see if an external RADIUS server(s) has been configured for the guest WLAN. If
so, the controller creates a RADIUS access-request packet with the username and
password and forwards it to the selected RADIUS server for
If no specific RADIUS servers have been configured for the WLAN, the
controller checks its global RADIUS server configuration settings. Any external
RADIUS servers configured with the option to authenticate “network user” will
be queried with the guest user’s credentials. Otherwise, if no servers have
“network user” selected, and the user has not been authenticated through steps
1 or 2, the authentication will fail.
Is it possible to skip the guest user authentication and display only the
web page disclaimer option?
A. Yes. Another configuration option of wireless guest access is to bypass
user authentication altogether and allow open access. However, there might be a
need to present an acceptable-use policy and disclaimer page to guests before
granting access. In order to do this, a guest WLAN can be configured for web
policy passthrough. In this scenario, a guest user is redirected to a web
portal page which contains disclaimer information. In order to enable
identification of the guest user, passthrough mode also has an option for a
user to enter an email address before connecting.
Do we need to have the remote controller and guest anchor controller on
the same mobility group?
A. No. The guest anchor controller and the remote controller can be on
separate mobility groups.
If there is more than one guest SSID, can each WLAN (SSID) be directed to
a unique web page portal?
A. Yes. All guest traffic, either on a single or multiple WLANs are
redirected to one web page. Starting from WLC version 4.2 or later, each WLAN
can be directed to a unique web portal page. Refer to the
Login, Login Failure, and Logout Pages per WLAN section of
Wireless LAN Controller Configuration Guide, Release 7.0.
What is the functionality of the new setting in the WLC release 7.0,
WebAuth on Mac Filter Failure?
A. If a WLAN has both a Layer 2 (mac-filter) and Layer 3 security
(webauth-on-macfilter-failure) configured, the client moves to
RUN state if either one is passed. And if it
fails Layer 2 security (mac-filter), the client is moved to Layer 3 security
Does the client operate properly if the browser is configured for proxy
A. Prior to release 7.0, client could not establish a TCP connection when
proxy server was configured in the browser. After release 7.0, this WebAuth
Proxy server support is added and Proxy server IP address and port can be
configured on the controller.
Is there a deployment guide for Wireless Guest
A. This is the link to the deployment guide:
Guide: Cisco Guest Access Using the Cisco Wireless LAN Controller
Is there a design guide for Wired and Wireless Guest
A. This is the link to the design guides:
Unified Wireless Guest Access Services
Guest Access using Cisco WLAN Controllers Configuration Example