Thinkcentre Edge M-Series with duplicate mac address

We have a lot of Edge M-Series all with the same MAC address appears in Bios (F1), using Windows 8.1 perhaps need to modify media access control with custome address, it's there an Bios update available or any issue to fix this ?

Have you updated to the latest BIOS?
If so, then: In device manager/network adapters, check the intel ethernet device, under the advanced tab, the ability to set the locally admin address (MAC.)

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ISG session with duplicate mac addresses - ASR 1k

Hello all,
I have an issue with current ISG implementation on ASR 1k.
We have subset of subscribers that are authenticated based on their mac address and another subset that are authenticated based on their c-vlan/s-vlan tag which is derived from nas-port-id. If two subscribers have identical mac addresses and one is authed based on mac and the other is based on c-vlan/s-vlan, the last one to auth kicks the previous authenticated session and takes it's place, which is totaly unacceptable.
For subscribers with mac based auth, session initiatior is unclassified mac address, as for c-vlan/s-vlan based auth it is dhcp request.
Forgive the lack of details, if anything I am ready to supply any available and open info. Personaly I think this is just shortcoming of ASR 1k s ISG implementation, because I know for a fact that 9K BNG handles this situation very well and has a more precise definition of c-vlan/s-vlan than 1k.
Any ideas on how to tackle this?

Hi,
Not sure if it would be possible since mac address is probably being used as a session key for both sessions (that's why the latest subscriber to come up, takes over the first one) even if you are using different identifiers (mac-address vs c-vlan/s-vlan).
Are these L2 subscribers or routed subscribers?
Could you provide a configuration of the ISG?
Regards.

Computer names persistently associated with a MAC address causing problems

Our WDS server will assign out a computer name like CompanyName### This is great.
The problem is sometimes WDS will assign a computer name that is getting associated with the MAC address somehow--I assume this is what's happening--and kick a computer off the domain that now has that computer name.
Is there some way I can disable the association of computer names with MAC addresses, or persistent computer names?

Hi,
How did you define your naming policy in WDS or in your answer file?
3.1.1.4 Machine Naming Policy
http://msdn.microsoft.com/en-us/library/dd871418.aspx
Please also check this hotfix:
Windows Deployment Services generates duplicate client computer names when the %MAC variable is used
http://support.microsoft.com/kb/957051
Hope this helps.

WGM - Can't add computers due to duplicate MAC address

Hello all,
I'm having a problem with 10.5.4 Server where once a computer is deleted from WGM it can't be added back. WGM gives an error message about duplicate MAC addresses. It appears that, although the deleted computer is no longer listed, the MAC address and name seem to still either be cached or in the database.
Any ideas?
Thanks

Saw you have no replies yet... did you ever get this issue figured out?
It's a shot in the dark, but years back we used to get zombie Macs (er, MACs) that would not show up in the list of computers, but were "still in the system" as a damaged record. Try enabling the "All Records" tab from the WGM prefs and searching for the computer record there, within the "Computers" list. If you can find them, deleting them should allow you to add them back in normally.
Let us know. Cheers, Joel

WPA with local MAC address authentication

Can Cisco Aironet AP support WPA encryptions with local MAC address authentications as the current setup i have do not have a radius server to authenticate my users.
i tried configuring with local MAC address but no success.

Try this:
conf t
access-list 700 deny xxxx.xxxx.xxxx 0000.0000.0000
access-list 700 deny xxxx.xxxx.xxxx 0000.0000.0000
access-list 700 permit 0000.0000.0000 ffff.ffff.ffff
dot11 association mac-list 700
Replace the xxxx.xxxx.xxxx with each host you want to allow on the AP. This will block any other MACs from accessing the AP. This is not by SSID, this is by AP, so let me know if this will work for you.

Synching desktop Address Book with my .Mac Address Book. Is it possible?

Can i sync my desktop address book with my .Mac address book?
Thanks.

I am also having this problem with my address book synching to .Mac. But my calendar and bookmarks have appeared with no problem so I'm not doing anything wrong -and I haven't created custom profiles either. Do you really think this is due to the lead up to Mobile Me? If so, why did the bookmarks etc sync with no problem? It is frustrating because this is what I really need to access.

How can I sync my iPhone5 contacts with my Mac Address Book

How can I sync my iPhone 5 contacts with my Mac Address Book?

Are you have Lion or Mountain Lion on your Mac?

Duplicate MAC addresses on touch panels

I have 2 TPC 2012 touch panels (out of 15) with the same MAC address. Of course since the MAC address is the same, this causes network problems such as duplicate DHCP assigned IP addresses.
How can this happen?
How do I fix it?
Message Edited by dbtestcon on 09-18-2008 02:46 PM

Hello,
Before we go any further, I need to confirm that the MAC addresses are really the same. I need you to submit a screenshot of the two addresses.
Can you type ipconfig/all in your command prompt. Take a screen shot of the Physical Address. Also, go to control panel > network connections > local area connection. Right-click and go to Properties. Left-click on Configure. Take a screenshot of the Advanced Tab as well. Post those and we'll go from there.
National Instruments
Applications Engineer

Duplicate MAC Addresses?

Hi Folks,
Has anyone experienced duplicate MAC addresss issues with the UCS-B/6120 connected to a 6500? I'm seeing the following on my 6500:
6506#sh arp | inc 0025
Internet 10.1.79.60             0   0025.b501.0005 ARPA   Vlan210
Internet 10.1.79.62             4   0025.b501.0007 ARPA   Vlan210
Internet 10.1.79.98            51   0025.b501.0005 ARPA   Vlan210
I checked my profiles and they appear to each have a uniquely assigned MAC address.   The correct entry is 10.1.79.60 and the 6120 should be replying with 0025.b501.006 for 10.1.79.98.
Anyone got any thoughts on how to correct this issue?
Take Care
Jason

There is nothing wrong with what you're seeing. It's acceptable to have N IP addresses resolve to 1 MAC
address. That is the case with secondary IP addresses for instance, Proxy-ARPing, "plumb" interfaces, etc.

Duplicate MAC Addresses effect

Hi All,
I have a query regarding the entry of duplicate MAC entries in switch. I tried issuing the following command:-
Switch(config)#mac address-table static 0007.e9f6.4fd2 vlan 1 interface fa0/2
Switch(config)#mac address-table static 0007.e9f6.4fd2 vlan 1 interface fa0/3
And after issuing the command, the resultant MAC table was as follows:-
1 0007.e9f6.4fd1 STATIC Fa0/2 Fa0/3
What does this signify. Where would a packet destined to this MAC address reach (I mean the port that it will reach)
Does it mean that there could be Network Load Balancing?
Thanks,
Sridhar.

HI
It will reach to the port where the end system is connected.u just deifined the mac-address as static on two ports u will not connect the end system to two ports so on the port which u r end system will connected will be up/up and on the port which the end system is not connected it will be in down state.hope i am correct in this if not plz correct me.
Thanks
Mahmood

Router receives a frame/packet with unknown MAC address

Hi Everyone,
Lets assume that a router received a frame/packet on an interface due to switch did not have the destination mac address listed on its mac address table and therefore broadcatsed this packet out of all ports, and router receives that packet that was not even intended to reach it. Would the router route that packet or drop? Just wondering if my assumption is true and router would drop a frame/packet that it receives on an interface if the destination MAC address of this frame/packet is not a MAC address of the routers's interface that it was received on.
Thanks!

Hey but I don't think router ever does a destination mac check! (that's surprising indeed), looks like router does not check the destination information, until it strips off ip packet from the frame! have a look at what a router does when it receives a frame (with any destination mac addr) here:-
http://www.ciscopress.com/articles/article.asp?p=2244117&seqNum=2

802.1x phone with two MAC address

Hello,
I have following scenario: Computers are connected behind phones, and phones are authenticating with MAB. The problem is with phones, because they have two mac addresses one is in voice vlan and another is in data vlan. Both phone and computer are authenticated successfully but when switch sees additional MAC address of phone in data vlan it shuts down port. Here is sample configuration:
interface FastEthernet0/1
switchport mode access
switchport access vlan 10
switchport voice vlan 15
authentication host-mode multi-domain
authentication port-control auto
dot1x pae authenticator
authentication violation shutdown
mab
spanning-tree portfast

Can you verify if the phone's mac address is being learned on the data vlan and the voice vlan? Because cisco phones use cdp to discover if a voice vlan is configured on the switchport before forwarding traffic.
Please issue a show mac address table interface x/y after bouncing the port to see what is causing the port to error disable.
Also what version of code is running on the switch and phone?
Thanks

Time Machine stopped working with new Mac address.

Greetings,
I have an IOMEGA 500, FireWire which I used to use for Time Machine. I now have a new Mac address and do not have access to the old Mac address. Is there any way that I can get the IOMEGA to start working with Time Machine? If so please give me step by steps instructions on how to make this external hard drive work again with Time Machine.
Any help is most appreciated.
Thank you for your attention to this matter.

macuserr222 wrote:
Greetings,
I have an IOMEGA 500, FireWire which I used to use for Time Machine. I now have a new Mac address
Do you have a new Mac, or a new logic board? Either will get you a new MAC (Media Access Control) address, which Time Machine interprets as a different Mac.
Do you mean you haven't started doing backups of the new Mac, and want to view the old ones? If so, see #E2 in [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of the +Time Machine+ forum).
If you want to use the old backups to set up a new Mac, see [Setting up a new Mac from an old one or its backups|http://web.me.com/pondini/AppleTips/Setup.html] (or use the link in *User Tips* at the top of this forum).
When you do your first backup, OSX should ask how you want to handle the old backups. See #B5 in Troubleshooting for details.
If that's not what you mean, please explain exactly what's going on, and what happens when you try to do whatever you're doing.
Message was edited by: Pondini

Is there any way to locate an iPad with a MAC Address and a Serial Number?

I happen to know the MAC Address for my recently stolen iPad. Is there any way to use that to locate an IP address the next time it accesses the web?

Not really. Other software would have to be installed on the device to locate it. That's what Find My iPhone is for (and it's free).
File a report with your local police.

Duplicate MAC Address on HP 8530p

Hi all
We just have figured out, that we have more then one HP Elitebook 8530p with the same MAC address. Special is, that the MAC address is in a unusual range. It has the number 88:88:88:88:87:88. There are more then one notebook that has the same MAC. We have updated the BIOS to the latest available, but without a solution. Also in the BIOS there is no way to change it physical.
We need a unique MAC because we do deploy the OS with PXE in SCCM and therfore it must be unique.
Any hint what we can do in this manner?
Kind regards, Stefan

Print a Wireless Network Test.
I hope you are not using this for MAC filtering on your router. It is pretty much a useless security method.
Read more here.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

Thinkcentr​e Edge M-Series with duplicate mac address

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Thinkcentre Edge M-Series with duplicate mac address