MAC addresses are different

I bought a new MacBook Air a few days ago and have been setting it up. When I tried to connect it to the Internet, I had to enter the MAC address of the computer into the system of the Internet provider.
I looked up the MAC address by going into "About This Mac". Under "Bluetooth" there is a twelve digit address given which ends in the letter 'd'.
I tried that MAC address but it didn't work and I couldn't connect to the Internet.
While I was in Network in System Preferences, I noticed there was a MAC address there. It was the same one as the one above except for the last letter/number which was a 'c'.
I entered that into the system and I was able to be connected.
Is that normal? Does the Bluetooth have a slight differently different address to get connected than the Internet?

On browsing the Internet, I think I found the answer:
QUOTE:
Some info first. All bluetooth devices have a hardware address similar to the MAC address for network (NIC) cards. That address is the unique identification information on the dongle.
From: http://www.siddharthabbineni.com/tech/hardware/change-bluetooth-device-mac-addre ss.html
So the bluetooth device, the MacBook Air, has a different address to the MAC address for the network, though they are very similar (only the last letter is different in the case of my MBA).

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Two MAC Addresses are showing up under one device

I have an AC1900. My Son and I both have iPad's. In the device list in Smart Wi-Fi, it shows both devices as one.
How do I split these out into two devices so I can manage my son's device with parental control?

Did you confirm that the iPads MAC addresses by looking in the iPads settings?
Are both the iPads named the same in the device?
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SCOM Network Discovery - Duplicate nodes with different Device Keys (MAC address)

Hi There,
We have deplyed SCOM 2012 SP1 for server and network monitoring. In the "Network Devices" view, there are few duplicate node entries for the same device. When i look at the details of each entry, the device keys (MAC address) are
different. for example, if there are 3 entires for the same device, only one will have the correct MAC address and remaining 2 are incorrect.
Have anyone came across such issue? Any solution to avoid the duplicates?
Thanks.
Venu.
Best regards, Venu.

Last Thursday (9/25/14), Microsoft provided me with an updated version of a file that is used as part of the discovery process. At first, it appeared to only resolve the issue for some devices which was disappointing. On Saturday, I decided
to remove all managed devices and rediscover everything from scratch. We have 237 devices to monitor. Since Saturday, I had one ICMP only device duplicate itself, but after I removed the duplicate, I have not had any other duplicates created and
there have been many rediscoveries ru nsince then. So far so good. I've asked Microsoft to keep the case open until next Monday. This weekend, I have a full discovery scheduled to run on a schedule. I'll feel good after that if there
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Mac-Address Different format for Authorization on Cisco ISE

Dear All,
I have problem with my Cisco ISE,
This is the design :
ISE ---- Core Switch ---- 3Com Switch --- PC User
My Case:
Authorization is based on Mac-address and Active Directory,
But user with PC that connect to 3Com swtich is Deny by ISE because the Format Mac-address is different with Cisco,
Mac-address Cisco format : XX:XX:XX:XX:XX:XX
Mac-address 3Com format : XXXX-XXXX-XXXX
3Com Switch type is TRICOM 4210 26-PORT.
Anyone have experience with this? and how change the mac-address format in 3Com so user can authorized by Cisco ISE.
note:
authorization based on Active Directory is not problem with 3Com Switch.
Based on my experience, Different product is different format mac-address, so this case not only for 3Com Switch.
Thanks,
Arika Wahyono

I do not think Cisco will add these vendors to the supported switch matrix because then it would be a support issue that cisco would have to deal with, much like most of the AD issues I experienced when I worked in TAC. Your best bet would be to run the evaluation license instance in a lab and have a 3com switch point against that.
Other than that I do not recommend upgrading to 1.2 without validating that the new "multi-vendor" MAB support will work on your switch.
PS- Keep in mind that my comments is just my opinion so you may need to open a TAC case for an official answer.
Tarik Admani
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Airport MAC address not set at factory?

I just received my new MacBook Pro and was getting ready to set my router so that DHCP requests from the new Macbook Pro would receive the same IP address on my home LAN.
The IP address for the Airport in my new machine is: 00:11:22:33:44:55 as determined by the following terminal command.
macbookpro:~ pderby$ ifconfig en1 | grep ether
ether 00:11:22:33:44:55
I tried to "spoof" the address with this command:
sudo ifconfig en1 lladdr 00:19:e3:d8:f5:07
which does not throw an error, but does not work.
Anyone else get a MacBook Pro where the MAC address for the airport was not set?
Any ideas on what to do?
I suppose I can just tell my router the MAC address is 00:11:22:33:44:55

Of course the MAC address and the IP address are two different things. I'm not sure why, Kappy, you thought I had this confusion. And I beg to differ, but MAC addresses are by interface, not by machine. So the ethernet port has a different MAC address than the Airport. They HAVE to have different MAC addresses or using two IP connections at the same time will not work when both ports are active at the same time and have the same MAC address. Using both ports at the same time with two independent IP addresses is completely supported by BSD Unix as well as OS X.
On my new machine the Ethernet Port EN0, has the MAC address 00:23:32:c8:27:4a
On my new machine the Airport Port, EN1, has the MAC address 00:11:22:33:44:55
I've had a lot of Macs, and this is the first time I've had an airport with this "default" MAC address.
My question is 1) does anyone else have a MAC address of 00:11:22:33:44:55 on their new MacBook Pro for the Airport hardware? If so, is this correct? Usually the MAC address has a manufacturer's Id embedded followed by a unique ID. 2) If someone is in the same situation have you talked to Apple about this? What did they have to say?
I can spoof the MAC address temporarily via the terminal, but it will reset to the hardware address on reboot.
Message was edited by: Paul Derby

MAC Address-Table Move Update Feature

Hi guys
Does 6500 SUP720/2T support MAC Address-Table Move Update Feature?
I cannot find it in anywhere..
Thanks very much!
QXZ

Hi,
Please refer following link :
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00807347ab.shtml
CAM
—All Catalyst switch models use a CAM table for Layer 2 switching. As frames arrive on switch ports, the source MAC addresses are learned and recorded in the CAM table. The port of arrival and the VLAN are both recorded in the table, along with a timestamp. If a MAC address learned on one switch port has moved to a different port, the MAC address and timestamp are recorded for the most recent arrival port. Then, the previous entry is deleted. If a MAC address is found already present in the table for the correct arrival port, only its timestamp is updated.
regards,
Ajay Kumar

MAC Address quagmire

Try to find where I can add another MAC address so that my Lexmark X6570 can print/fax/scan from my MacBook Pro. It seems my MAC address for the Airport Exteme is running on xx.x.x.200 where as my printer is running on xx.x.x199
Someplace on the Mac there is suppose to be a place where I can add the MAC address xx.x.x199 but I'm at a loss to find it.

What their trying to tell me I believe is that the reason my MacBook and their All-In-One Printer are noy communicating is because the two MAC address are not the same. The one for the Mac is 00:1b:63:04:d9:cd and the one for the printer is 00 20 00 1A 4C I have changed a few letter and numberrs in them both for the query.
The two MAC addresses do not have to be the same. They are supposed to uniquely identify the hardware. Do you really think all computers and all "all in one" machines have the same MAC address? Also, the IP addresses cannot be the same. So, I'm not sure what Lexmark support told you, but what you are conveying is definitely not correct in any way.
My best guess at what they were telling you was that they are not on the same subnet. The first three octets need to be the same, with the last octet being different for each device on the subnet.
the Aiport Extreme is saying 199.
How exactly is your network set up? Is the Airport Extreme your router, or is it only acting as a bridge?
The reason I ask is that if it has a .199 as the final octet, it is not acting as the router. The Airport extreme will take the .1 octet for itself, and distribute IP addresses from 2 to 200. It is getting an IP address from somewhere else and is not serving out IP addresses. Do you have another router in the network? Is the modem a router?

HP MAC address list

Is there a list somewhere of which HP devices are assinged which parts of HPs 80:C1:6E:x:x:x range ?

Hi,
MAC addresses are assigned to the network card by the manufacturer. Since HP uses OEM cards supplied by different manufacturers, I don't believe that such a list exists. Each MAC is unique.
HP appears to be using this list.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
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Mac Address restriction

Hi there,
I have a express acting as a access point to my network for wireless devices, just wondering if anyone know if it is possible to restrict access via MAC address within the express station? This is a last attempt by me for some security as I can't get encryption to work with all devices. Any help will be good, thanks
Thanks
Connor

You can, however in my opinion it only adds a superficial level of security which can be easily broken.
Airport Admin Utility -> Configure > Access Control Tab.
It use to be useful, but MAC address access control is really no longer a real option when it comes to wireless security.
The problem arises as the MAC addresses are sent unencrypted and therefore can be picked up and read by a determined hacker.
Not only that with many ethernet devices you can now very easily change the MAC address to a different one, so making it very easy to spoof the Mac address and fool a wireless base station into believing that you are an authenticated client.
What security are you trying to configure?
WEP or WPA?
iFelix

Should I use a MAC address to validate users for my program?

I'm writing a graphical console program and I was planning on using a few methods for security. One being to block a user from logging in again if they don't type the correct username and password within three tries until the root user authenticates it again. I was planning on blocking the IP address but someone suggested blocking the MAC address since no 2 have the same ID and it's burned in, not to mention alot of people have dynamic addresses. However, I was reading that MAC addresses are mainly used in ethernet cards. I thought any device that has network capabilities has to have a MAC address? Is it good to use a MAC address for blocking someone from logging in again or what?

Its very easy to change your MAC address. If you have a wireless router (which you can buy for like 20 dollars) then you can tell it what MAC address to use. So I agree, don't use a MAC address to block users from your program. Also are you sending the username/password over the network in clear text? If so, these can be intercepted. So doing that may be a bad idea; it depends on how much security you want for your application.

WRT54GL MAC ADDRESS FILTER

Hi I have a wireless access point WRT54GL and i configure it with mac address filter but it allow me to put only 40 mac and i need more? Is there any way to add more? Thanx

Install 3rd party firmware like dd-wrt or hyperwrt+thibor. That should give you more. However, remember a bad flash may brick the router and is not covered by warranty.
Also remember, that the wireless mac address filter does not provide you with any reasonable security. MAC addresses are quickly captured and quickly cloned. It only takes a few minutes to gather some mac addresses which are allowed into your wireless network and that's it.
Set up wireless security with WPA2 or WPA and a strong passphrase. That's all you can do to really protect your wireless.
If you want more detailed access control, consider installing a RADIUS server and using user/password authentication based on WPA2 or WPA (using the RADIUS or Enterprise variants).
But the wireless mac address filter is widely overrated as security mean and only requires a lot of work and time to maintain the lists.

Changing MAC address on wrt300n

So what did I learn today ... never let your little brother on your PC when logged in at a forum ! Result = kicked out, profile deleted, IP banned !
So I gather that my ISP has only static IP's and they suggest to change my MAC address to get a new IP so I can return to the forum and sign up again with a new profile. So the question is ... how the heck do I change the MAC address on the router ? Anyone have a source that I can read up on this ? This is all very new to me.
Thanks in advance.

MAC addresses are like DNA. There are no two matching ANYWHERE in the world (each device in the world has a unique hexidecimal MAC address and no two are alike). Therefore you cannot change your MAC address.
What I can tell you is what your ISP really means. When you connect your router (which has a MAC address) to their modem, their modem memorizes your devices MAC address and assigns it an IP address. You need to make the modem forget this MAC to get a new IP.
To do this, turn off your modem and old router and leave it off for a bit (10 min). Borrow someone elses router (or if you have an old router, use it). Connect it. Turn on modem and new router. Leave on for about 15 min so that your ISP forgets the old MAC address of your original router and creates a new IP address under the new MAC address of the newly connected router.
After 15 min, power them both down again, disconnect the temp router and connect your original router. Power them back up and wait 15 min again. You *should* get a new static IP from your ISP as it thinks it's a new MAC again. The ISP doesn't remember MAC addresses, only their modem does and once it forgets, it should give you a new IP when you connect the router again.
Hope this helps!!

Changing MAC address (Ethernet ID)???

I was wondering if anyone knows an easy way to change the MAC address. I've found this suggestion elsewhere:
Open terminal
Type in sudo ifconfig en0 ether aa:bb:cc:dd:ee:ff (new address)
Type in password
When I type in the password it seems that my terminal freezes up. Any ideas of what I'm doing wrong? Are there any programs out there that are easier for this than just using the terminal? Thanks!

You should not change the MAC address. If you mistakenly assign an address that belongs to another device you will no longer be able to use yours. MAC addresses are device unique and there's no reason to change them. Leave well enough alone.

I have a Linksys WRT54G wireless router that has a MAC address

A month ago, I could print from my PC and my Mac to my Epson printer over my Linksys WRT54G wireless network. Now, for some reason, I cannot connect and print from either computer. An Epson tech asked me to check the MAC address of the Mac and the printer to see if they were the same. They were not. He then opined that might be why I couldn't print.
I don't know what changed a month or so ago or why it changed. I have not done anything to change the MAC address on either the MAC or the printer.
The Epson guy said the problem might be fixed by adding my printer's MAC address to my router's MAC address. Something about "enabling MAC address filtering". Then he told me that was an issue to pursue with my router manufacturer. Naturally.
Speaking of that problem...someone else had it, too...another technician at another site wrote: "...by default, routers don't come with mac address filtering enabled...and if that's the case....then adding the printer's MAC will not solve any issue that you may be having..."
So, three qustions:
(1) Can I add my Epson Workforce 545 printer's MAC address to my Linksys router? Is that possible?
(2) If I can do it, how do I do it? I saw no "add" or "edit" functions on the Linksys WRT54G Status Page.
(3) What causes MAC address mismatching to happen? What is unstable in that assembly?
Solved!
Go to Solution.

Mac addresses with different devices will differ. No two devices will have the same mac address. this is also called the hardware address. This is designed so that it will serve as a unique identifier of your devices in the network which you can check thru the router. Now it is possible that wireless mac filter might be blocking it from connecting to the network. But it would be best to check as well and make sure that the printer is connected to your network and has the same ip address segment as your router.
How to check if mac filter is enabled:
Setting up wireless MAC Filtering to permit users to connect to the wireless network on your Linksys...
Setting up wireless MAC Filtering to prevent users from connecting to the wireless network on your L...

Why does my AE gen 2 crash when I put my iPhone MAC address in?

AE gen 2 with Time Capsule.
I use MAC address for security (I think that is OK). I have a number of items that need WIFI and their specific MAC addresses are put into the box. All OK so far! Recently my wife and I have purchased iPhone which I also want to have access to WIFI from AE. In goes WIFI address for both phones and it will not restart after 'UPDATE' command given.
Push the reset button while it is plugged in and it comes back minus the MAC addresses specific to the iPhone!!!!!
Any ideas? Could it need replacing?
I tried going to WPA2 Personal but my wifes laptop kept coming back with "Connection Timed Out".
Have done HARD reset (Reset button with power cord out then insert while keeping reset button pushed) and no difference.
Any help would be very much appreciated.
Thx
David

Both our laptops are MacBook Pros.
Then they both really shouldn't have any issues connecting to a wireless network configured to use WPA2 Personal which uses the AES/CCMP encryption protocol. Currently the strongest security type available for consumer wireless networking.
I was under the impression MAC addresses were pretty secure.
Although MAC addresses are unique, as I have mentioned they can be spoofed. So a wireless client, using a spoofed MAC address, can easily bypass any security method that relies on these addresses. The other security failacy is closing or disabling the broadcast of the wireless network name. This may thwart the most casual network leech, but like MAC addresses, the network name (or SSID) can still be found using utilities easily obtained from the Internet.

MAC addresses are different

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