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Cisco Wireless LAN Solution Product Guide
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Chapter 5 Configuring Wireless LANs
Configuring Wireless LANs
IKE Diffie-Hellman Group
IPSec IKE uses Diffie-Hellman groups to block easily-decrypted keys. Enter these commands to
configure the Diffie-Hellman group on a wireless LAN with IPSec enabled:
• config wlan security ipsec ike DH-Group wlan-id group-id
–
For group-id, enter group-1, group-2 (this is the default setting), or group-5.
• Enter show wlan to verify that IPSec IKE DH group is configured.
IKE Phase 1 Aggressive and Main Modes
IPSec IKE uses the Phase 1 Aggressive (faster) or Main (more secure) mode to set up encryption between
clients and the controller. Enter these commands to specify the Phase 1 encryption mode for a wireless
LAN with IPSec enabled:
• config wlan security ipsec ike phase1 {aggressive | main} wlan-id
• Enter show wlan to verify that the Phase 1 encryption mode is configured.
IKE Lifetime Timeout
IPSec IKE uses its timeout to limit the time that an IKE key is active. Enter these commands to configure
an IKE lifetime timeout:
• config wlan security ipsec ike lifetime wlan-id seconds
–
For seconds, enter a number of seconds from 1800 to 345600 seconds. The default timeout is
28800 seconds.
• Enter show wlan to verify that the key timeout is configured.
IPSec Passthrough
IPSec IKE uses IPSec Passthrough to allow IPSec-capable clients to communicate directly with other
IPSec equipment. IPSec Passthrough is also known as VPN Passthrough. Enter this command to enable
IPSec Passthrough for a wireless LAN:
• config wlan security passthru {enable | disable} wlan-id gateway
–
For gateway, enter the IP address of the IPSec (VPN) passthrough gateway.
• Enter show wlan to verify that the passthrough is enabled.
Web-Based Authentication
Wireless LANs can use web authentication if IPSec is not enabled on the controller. Web Authentication
is simple to set up and use, and can be used with SSL to improve the overall security of the wireless
LAN. Enter these commands to enable web authentication for a wireless LAN:
• config wlan security web {enable | disable} wlan-id
• Enter show wlan to verify that web authentication is enabled.
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