Category: ISE

Cisco ISE 2.0 – Guest authentication ISE configuration

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This is a 4 part blog series about configuring Cisco ISE 2.0 for WLAN authentication and WLAN Guest authentication (split into two parts) on a Cisco Wireless LAN Controller (WLC).
ISEimageFor more guides about configuring (previous) Cisco ISE, see this page.This is part 4, the ISE configuration for guest access

Configure Cisco ISE

The Authorization profile will be created first, then the authentication and authorization policies are configured.
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Cisco ISE 2.0 – Guest Authentication

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This is a 4 part blog series about configuring Cisco ISE 2.0 for WLAN authentication and WLAN Guest authentication (split into two parts) on a Cisco Wireless LAN Controller (WLC).ISEimage
For more guides about configuring (previous) Cisco ISE, see this page.This is part 3, configuring the Cisco WLC for guest access.
Configure WLAN’s on WLC

  1. Navigate to WLAN’s, Create new

Picture12. Configure General Settings:
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Cisco ISE 2.0 – Employee Authentication Based on 802.1x (User auth)

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This is a 4 part blog series about configuring Cisco ISE 2.0 for WLAN authentication and WLAN Guest authentication (split into two parts) on a Cisco Wireless LAN Controller (WLC).ISEimage
For more guides about configuring (previous) Cisco ISE, see this page.This is part 2, creating authentication and authorization policies.
Create authentication policy

  1. Navigate to Policy, Authentication
  2. Edit, Wired_802.1X to include Wireless_802.1X, and select “ehlo.lan” domain store.

Picture1
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Cisco ISE 2.0 Active Directory & Radius

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This is a 4 part blog series about configuring Cisco ISE 2.0 for WLAN authentication and WLAN Guest authentication (split into two parts) on a Cisco Wireless LAN Controller (WLC).
ISEimageFor more guides about configuring (previous) Cisco ISE, see this page.This is part 1, the prerequisites before you can start configuring any authentication method.
Add ISE to Active Directory domain
Login into ISE and add ISE to the Active Directory domain by following these steps:
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Cisco ISE Part 10: Profiling and posture

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, the last post in the Cisco ISE blog post series: Profiling and posture. For both features is the Cisco ISE advanced license required.
Profiler is a functionality for discovering, locating and determing the capabilities of the attached endpoints. It will detect the network type and will authorize it.
A sensor in the network captures network packets by quering the NADs, it forwards the attributes to the analyzer. The analyzer checks the attributes using policies and identity groups. The results is stored in the ISE database with the corresponding device profile. The MAC address of the device will be linked to a existing endpoint identity group.
There are 9 availabled probes:

  • Netflow
  • DHCP
  • DHCP SPAN
  • HTTP
  • RADIUS
  • NMAP
  • DNS
  • SNMPQUERY
  • SNMPTRAP

Profiling uses CoA (change of authorization). There are 3 options:

  • No CoA: CoA is disabled
  • Port bounce: use this only of there is a single session on a switchport
  • Reauth: enforce reauthentication of a currently authenticated endpoint when it’s profiled

ISE creates three identity groups by default and two identity groups that are specific for Cisco IP phones. Creation of extra groups is optional.
An endpoint profiling policy contains a simple condition or a set of conditions (compound).
Configuring
Probe configuration
First, make sure the ISE appliance can SNMP to the switches (SNMPv2 or 3) with a read only community string. Also, configure a snmp trap destination to Cisco ISE policy node.

Switch(config)# snmp-server host 172.20.12.5 version 3 priv ISE
Switch(config)# snmp-server enable traps snmp linkdown linkup
Switch(config)# snmp-server enable traps mac-notification change move
On all interfaces:
Switch(config-if)# snmp trap mac-notification change added

For DHCP probing, configure an additional IP helper on the SVI to the policy node:

Switch(config-if)# ip helper-address 172.20.12.5

Cisco ISE configuration
Click Administration – System – Settings, click Profiling and configure the CoA.
profile5
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Cisco ISE Part 9: Guest and web authentication

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, part 9: Guest and web authentication
Webauthentication can be used for guest access. It can also being used for a last resort for authentication of normal users if the 802.1x supplicant is not working. Access to this portal can be done by a remediation VLAN with limited access to resources. The portal is using HTTP and HTTPS,  because of limited access, the NAD (or WLC) will intercept the HTTP request and redirects it to the web portal.
There are two portals: Guest user portal is a portal the guest is using for logging in. The Sponsor portal is a portal being used by company employees for creating and managing guest accounts. The guest portal is customizable in available options for guest users.
To manage the RADIUS requests, the portal is installed on all required policy nodes. The configuration of the portal (and users) are replicated to all nodes. So, there is a central deployment.
You can configure multiple authorization sources in one rule. So, you can use one SSID for all used: internal production use, BYOD, Guest, etc. This is a nice feature of Cisco ISE.
Configuration
Click Administration – Guest management – Settings, click the arrow and click Multi-portal configurations.
Edit the DefaultGuestPortal to your needs:

  • Password policies
  • Need of posture client
  • self service
  • device registration
  • DHCP settings
  • Policies
  • etc

guestportal1
guestportal2
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Cisco ISE Part 8: Inline posture and VPN

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, part 8: Inline posture and VPN
The fourth ISE node role is inline posture. This appliance can be placed in your network for devices which don’t support CoA (Change of authority). Cisco ASA doesn’t support CoA yet (but will come in the near future). This role is hardware appliance only, the VM is not supported.
This node is a gatekeeper that can enforce policies and handles CoA. After initial authentication of a client, the client still must go through posture assessment.
There are 3 possible modes:

  • Router mode: This is a L3 hop in your network. This node is default gateway for clients. Only static routes are available!
  • Bridge mode: is transparant in your network
  • Maintenance mode: takes node offline, traffic should be uninterupted, this is de default mode

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Cisco ISE Part 7: Configuring wireless network devices

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, part 7: Configuring wireless network devices
Configuration
First, add the WLC as a radius client.
Click: Administration – Network Resources – Network Devices. Click Add and create a network device object.
Click Select Existing condition from library, select condition, navigate to Compound condition and select wireless_802.1x.
Click Select Network Access, Allowed Protocols – Default network access. Make sure PEAP is available in this network access rule.
For the authorization profiles, click Policy – Policy Elements – Results
Make sure you select the correct Airespace ACL name.
authprofile
Create an authorization policy that assigns the authorization profile. Click Policy – Authorization. Insert a new row.
Create a new rule, select the “wireless_802.1X” compound condition from the library. To check if the user is also a domain member, add another attribute. Click Select Attribute – <domain> – <usergroup>
 
Browse to the WLC webinterface.
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Cisco ISE Part 6: Policy enforcement and MAB

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, part 6: Policy enforcement and MAB
Policy enforcement in Cisco ISE is based on authentication en authorization.
Some authentication protocols:

  • pap
  • chap
  • ms-chapv1/2
  • eap-md5
  • eap-tls
  • leap
  • peap
  • eap-fast

Authorization can exist of:

  • DACL
  • VLAN
  • webauth
  • smartport
  • MACsec
  • WLC ACL
  • NEAT
  • Filter-ID
  • reauth timer

Authentication policy: defines to protocols ISE is using to communicate with network devices
Policy: set of conditions
Condition: a rule with true of false as response
The result of an authentication policy is the identity method. It can be any one of the following:
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Cisco ISE Part 5: Configuring wired network devices

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This is a Cisco ISE blog post series with some how-to’s for configuring the ISE deployment, This blog post series exists of 10 parts.
The blogpost Agenda:
Part 1: introduction
Part 2: installation
Part 3: Active Directory
Part 4: High Availability
Part 5: Configuring wired network devices
Part 6: Policy enforcement and MAB
Part 7: Configuring wireless network devices
Part 8: Inline posture and VPN
Part 9: Guest and web authentication
Part 10: Profiling and posture
This week, part 5: Configuring wired network devices
First some terminology and guidelines:
Single host mode / Multi host mode. This defines 1 or multiple hosts on the switchport. Only the first device needs authentication.
Ports are authenticated first before any other traffic can pass.
802.1x is disabled in a SPAN port configuration, trunk ports, dynamic ports, dynamic access ports and etherchannels.
The windows client configuration can be pushed by a GPO. Configuration of this GPO is out of scope for this blog.
Configuration
First, add the RADIUS clients in the ISE deployment.
Click: Administration – Network Resources – Network Devices and click Add. Enter the requested information:
Radius client1
Radius client2
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