ā11-26-2010 05:53 AM - edited ā07-03-2021 07:28 PM
I have 2 ssid, one open and other with wpa in 2 vlans, i use a external dhcp server, this run ok with ios version 12.4-10b JDA, when i upgrade firmware to 12.4-21a.JA the dhcp server received dhcp request and send ip number to clients but the clients not received this ips. Can any one help me ?
ā11-27-2010 11:44 AM
I've never seen something this big happening.
If you upgrade to 12.4.21 JY or so, does it give better result ?
I would suggest to investigate deeper, like checking if the DHCP offer from the server reaches the AP and if it really seems that the AP is trashing it.
Nicolas
ā11-28-2010 12:01 PM
if I downgrade the ios version the problem disapear , i upgrade one 1141 to to 12.4.21 JY and dhcp fails too.
Tomorrow i will review the configuration line by line.
ā11-29-2010 05:40 PM
Hi.. just tried the same and the DHCP is working well.. without any issues..
Regards
Surendra
ā11-30-2010 03:09 AM
i found the problem, l2-filter block-arp , with previous version not fail, and with this ios fail.
Any idea ?
ā11-30-2010 05:42 AM
Hi,
Have you configured 'wpa optional' by any chance ?
If yes, there is a bug CSCte08161 on 12.4(21a)JA1 where in AP may drop DHCP offer though it is sent by wired lan
In your case, you mentioned that DHCP server does send offer but clients do not get.
This bug does not affect 12.4(10b)JDA as you can see from bug description.
Workaround : not to use optional or downgrade to 12.4(10b)JDA
Again this might be the bug iff you are using 'wpa optional'
Regards,
Madhuri
ā11-30-2010 09:01 AM
My configuration is :
authentication open eap eap_methods
authentication key-management wpa
accounting acct_methods
mbssid guest-mode
I try to change to
authentication key-management wpa 1
or keep version 12.4(10b)JDA
Thanks
ā11-30-2010 05:18 PM
Hi,
If you are not using wpa optional then this might not be the bug. However we can doublecheck.
If you are using TKIP as cipher, try setting it to 'authentication key-management wpa 1' and see if issue can be reproduced in 12.4-21a.JA
If you are using AES as cipher try setting it to 'authentication key-management wpa version 2'
Regards,
Madhuri
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