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Cisco Bug: CSCte08161 - cannot get IP address from server if key-management is "wpa optional"

Last Modified

Jun 30, 2016

Products (1)

  • Cisco Aironet 3700 Series

Known Affected Releases

12.4(21a)JA1 6.0(188.0)

Description (partial)


Wireless client does not get the IP address from dhcp server since AP 
does not forward the dhcp offer packet to the client if key-management 
is "wpa optional".
We can see 802.1x succeeds, then dhcp offer is in ethernet side.

This problem happens when dhcp offer is a broadcast packet.
If dhcp offer is an unicast packet, this problem does not happen.

12.4(10b)JDA does not cause this problem.

/config highlight/
dot11 ssid tsunami
   authentication open eap eap_methods 
   authentication network-eap eap_methods 
   authentication key-management wpa optional
interface Dot11Radio0
 encryption mode ciphers tkip wep128 

 Reproducibility : Yes
 Condition : key-management is "wpa optional"
             dhcp offer is broadcast packet

 Software: 12.4(21a)JA1
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