TKIP Michael MIC problems

cisco

    Sponsored Links

    Next

  • 1. Cisco ACS Alternative?
    I know this is blasphemy for most of the Cisco gurus, but I am looking for a cheaper alternative to Cisco ACS. The company I work for currently implements both TACACS and RADIUS authentication in certain ways but the maintenance costs of Cisco ACS are tremendous for our budget. So I am looking for an alternative, here are the stipulations: 1. Must run on Windows Server 2003 2. Must support both TACACS and RADIUS authentication. 3. Must allow for authentication against our Active Directory. 4. Must be cheaper than Cisco ACS. Any suggestions? Also, does Microsoft IAS support TACACS and RADIUS authentication? Thanks, Robert
  • 2. 2900 XL switch
    I have 2 2900 catalyst switches that I bought at the same time. I recently erased the flash on the one accidently. The other switch has the same OS as the one that I flashed. How do I get the one over to the other? Please advise
  • 3. Need advice (books)
    What can you recommend for CCNA? Why the second book is the most expensive, it has 1024 pages meanwhile the book by Wendell Odom has 1320, and more than 30$ cheaper. Why? Also you can recommend books not listed here. Thank You in advance. 1.CCNA: Cisco Certified Network Associate Study Guide, Fifth Edition (640-801) by Todd Lammle $32.99 720 pages 2.CCNA Self-Study : CCNA Preparation Library (640-801) (6th Edition) (CCNA Self-Study)by Stephen McQuerry $76.02 1024 pages 3.CCNA Certification Library (CCNA Self-Study, exam #640-801), Sixth Edition by Wendell Odom $41.71 1320 pages
  • 4. Difference in setting up ATM 0 or ATM 0.1
    Can you tell me te difference in setting one of them in a 837? Which are the conseguences in setting an IP address on a ATM0 and the pvc on ATM0.1 (for example) or viceversa? Alex.

TKIP Michael MIC problems

Postby Fernando Enriquez » Sat, 02 Jul 2005 06:27:51 GMT

Hi everyone:

We've set up a complex installation for one client based on 40 Cisco 
1200 & 1100 APs working as parent-repeater (we have some branches with 
parent-repeater-repeater). We've deployed LEAP on APs and clients both. 
Everything is working fine until any client changes from one AP to 
another. When it starts to transmit traffic it gets blocked because of 
MIC encryption error. The situation remains for a few minutes, when 
suddenly encryption works again.

To minimize impact we have enables key-rotation every 20 seconds but the 
problem remains and users aro not able to work properly.

To validate users we have installed freeradius with leap support. Radius 
log shows that authentication is working fine (no errors)

This is a log excerpt of what happens when client 0040.96a7.c594 
desassociates from AP 192.168.4.207 and associates to AP 192.168.4.200




Re: TKIP Michael MIC problems

Postby Uli Link » Sat, 02 Jul 2005 17:50:48 GMT

Fernando Enriquez schrieb:

It's a feature to block a station after a number of MIC failures.
But this should not happen with allowed, legitimate stations.


What's the fw and driver version of your clients?

For the 350 series the very first fw supporting WPA with TKIP was 5.30.17.

What's the config of your APs? What's the IOS version on you APs?
The 350 series does not work with cipher set to TKIP+WEP (migration mode)

Tip: set up one low traffic AP as WDS, this will allow fast secure roaming.
For 350 clients I prefer CCKM over WPA, you can allow both on a SSID.

-- 
Uli


Re: TKIP Michael MIC problems

Postby Fernando Enriquez » Wed, 06 Jul 2005 00:15:49 GMT

I updated FW on clients and APs both to latest versiones a couple of
weeks ago but problem persists.



Cipher is pure TKIP, not migration mode.



I will try WDS to see if using this the roaming gets smoother. I will
tell you.



Thanks a lot for your interest





Similar Threads:

1.TKIP MIC failures

Hey

Ive got a few AP1200's that Ive just deployed. Most only have 1 or 2
associations right now as Im ramping it up for production.

Ive got 1 client an IBM laptop with an Intel 2200BG card that keeps
causing these errors on the AP.

%DOT11-4-TKIP_MIC_FAILURE_REPORT: Received TKIP Michael MIC failure
report from the station 000e.3568.a238 on the packet (TSC=0x0)
encrypted and protected by pairwise key.

I see these 1 every few minutes, sometimes it will happen more often
and then the radio interface is put on hold and all my WPA clients are
disassociated. All WPA clients diassociated is bad.

%DOT11-3-TKIP_MIC_FAILURE_REPEATED: Two TKIP Michael MIC failures were
detected within 0 seconds on Dot11Radio0 interface. The interface will
be put on MIC failure hold state for next 60 seconds.


So I read some about these messages and they point to someone attackign
my AP but these are being generated by MAC Addrs that are friendly.

Heres the rundown on my setup,  Cisco AP1200's IOS 12.3(2)JA configed
for WPA \TKIP  with a MS IAS RADIUS server backend.

Anyone ever see these errors before ?  Thanks

Timo

2.WPA/TKIP with AP1200

Hi gurus

I'm trying to configure an Windows XP SP1 supplicant with Patch Q815485 
with my laptop HP Nx7010. Initially I work with EAP-TLS + WPA TKIP & 
AP1200, it seems to work fine but after a few seconds the connection is 
broken and supplicant doesn't reconnect with the AP.
HAve you found this issue ?

Can you help me?

Thanks

Manel

3.Cisco ACS 3.3 and Windows 2003 IAS using EAP-TLS and TKIP

I was wondering has anyone every setup using Cisco ACS 3.3 (Radius)
with Windows 2003 IAS to authenicate with PKI cards for wireless and if
so what sets should I follow.  TIA

4.TKIP vs Broadcast Key Rotation

In some of the Cisco documentation, they state that broadcast key rotation
(BKR) "is an excellent alternative to TKIP if your wireless LAN supports
wireless client devices that are not Cisco devices or that cannot be
upgraded to the latest firmware for Cisco client devices."

I don't really understand how this is true. If BKR is only rotating the keys
for broadcast frames, then the user's session (unicast) key isn't touched
by this mechanism, right? So, the classic WEP cracking vulnerabilities
still apply, right?

Must be something I'm missing here... who can enlighten me?

Thanks,
Mike

5.Security of Cisco TKIP implementation on older products

Hello
I am still using Cisco AIR-352 with 12.3(8) IOS as access point, to provide 
connectivity on my wlan ad 802.11b speeds, with WPA-PSK TKIP security.

I have on a site, two AIR-BR352 point to point links at about 4km.
The bridges BR350 uses Wep128 security, and I know that it is unsecure.
On the config pages, I have enable MIC and TKIP settings.

So in the end I have these options enabled:
WEP 128
CISCO MIC
TKIP

This is the extract from cisco's documentations about the two options.


# Message Integrity Check (MIC) -- MIC is an additional WEP security feature 
that prevents attacks on encrypted packets called bit-flip attacks. The MIC, 
implemented on both the access point and all associated client devices, adds 
a few bytes to each packet to make the packets tamperproof.

# Temporal Key Integrity Protocol (TKIP) -- TKIP, also known as WEP key 
hashing, is an additional WEP security feature that defends against an 
attack on WEP in which the intruder uses an unencrypted segment called the 
initialization vector (IV) in encrypted packets to calculate the WEP key.

In the end, these bridges are in WEP128, but are they vulnerable to the 
common wep flaws (IV vector, and vulnerable to airsnort's scans)  ?

To be secure, I use a GRE+IPSEC (at the moment using DES encryption, later I 
will use AES128) tunnel between the two sites connected via the wifi 
bridge, to be more secure.



 

6. Cisco WLC - WPA MIC Errors.....all AP's same syptoms

7. IP phone i2004 audio mic level is low

8. 2 line headset with common mic?



Return to cisco

 

Who is online

Users browsing this forum: No registered users and 26 guest