Yes. Go to GUI interface. Click on "SECURITY" and click on "Encryption Manager" Select "WEP Encryption" and check "Enable Per Packet Keying" Also, you need to enable Aironet Extension.
When the AP sends out association response to the wireless client, Aironet Extension field tells the wireless client that CKIP is enable. If the wireless client understands and support CKIP, it will enable CKIP.