TKIP Michael MIC problems


    Sponsored Links


  • 1. serial cables
    I've got 3 2500 series routers that I want to connect together via the serial ports for a CCNA lab but I'm fairly confused about which cables I need. One of the routers came with a cable which is a CAB-V35FC. On one end it is female with 60 pins and on the other end it's got a big female connector with 34 holes, but it looks like it only has 18 pins. I think I'm supposed to connect two cables together. So do I need to find a cable that has a female 60 pin connector on one end and a big male connector on the other end? Can you connect them using 1 Cisco Serial Cross/Over Cable DB60 DTE-DC? Or do you always have to butt 2 cables together? Any help with this would be greatly appreciated. cheers
  • 2. Adtran 120 and Cisco VWIC-2MFT-T1-DI
    I have a Livinston Portmaster router with an Adtran 120 unit in a remote branch office. I also have a Livingston Portmaster with a Kentrox DATASMART ADD / DROP unit in the main office. The Point-to-Point T1 is split between voice and data I am in the process of ordering a Cisco 2620 with a VWIC-2MFT-T1-DI card to replace the livingston and Kentrox unit in the main office. Has anyone successfully been able to split voice and data on P2P T1 between an Adtran 120 unit and one the Cisco mutiplexer add / drop units (VWIC-2MFT-T1-DI) ...or does anyone think there will be problem splitting voice and data on the T1 between the Adtran 120 and the Cisco multiplexer units Thanks In Advance
  • 3. ANYONE!? - FTP and Front Page...
    Doc typed this: > Hello, > cisco 2620 with access-list: > access-list 101 permit tcp any any eq www > access-list 101 permit tcp any any eq 443 > access-list 101 permit tcp any any eq smtp > access-list 101 permit tcp any any eq ftp > access-list 101 permit tcp any any eq ftp-data > > > Rec'ng 425:Cannot build data connection:no route to host > > FrontPage, trying to upload some web pages. > > Thought ftp-data took care of the active vs. passive problem > but I'm probably just dumb. Anyone help shed some light on > this? Thanks. -- Rich "Doc" Colley mailto: XXXX@XXXXX.COM
  • 4. PIX501 configuration issue
    Hi We have a small company that we can access through a PIX501 with our repective VPN software clients. However, as it is possible to contact any computer on the internal company net from the vpn-client, why can't we get any access to each other when for instance two vpn-clients are online? The internal net is as the vpn-clients are getting adresses to 40. thanks in advance simon
  • 5. Remote router upgrade with two images in flash via tftp
    I need to perform a remote IOS upgrade on a Cisco 2600 series router. Normally I have the router sitting on my desk when I do the upgrade, but this time the router is a thousand miles away. I'm assuming I can tftp the image to flash with a new file name and it will save both images as long as I tell it not to format the flash. Am I correct? Also I need to tell the router to reboot and use the new image. I'm assuming I can use the boot command to point to the new image. Do I also need to give the router the path to the image in the flash memory? Thanks.

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 and associates to AP

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.


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


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


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?



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?


5.Security of Cisco TKIP implementation on older products

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

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 35 guest