Someone has changed my mac address

Hi everyone,
Having problems with my connection and my emails getting"lost" , not received either by me or my contacts, I want to undertsand what is going on, I suspect someone is spying , somewhere.
I checked , through my router interface all the mac adresses and did not find my imac.
I then went to check in my network preferences and saw that someone had changed my mac adress?? how come?
I want to know what was this mac adress to whom it belongs, please help??
Thanks a lot,

No. The person who has said they have evidence that my and other account have same mac and ip addresses has not shown me what they have or said how they got it.
They told me that myself and other user had same mac and ip addresses and that it was an iPhone that was used to send the messages over the site.
To them the evidence they have shows it's me using my phone to use 2 accounts.
However. I've only used this phone for the one account.
So if no 2 iPhones can show the same MAC address if through the same wifi router this could be what's happened?
If no 2 iPhones would show the same MAC address then what on earth has happened for her to see this?
Also - how would she of got this info and is it illegal or dangerous that she now has my mac and IP address?????
I'm sorry to ask so many questions but I really need to sort this and you are really helping. I appreciate all this help.

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bit (locally administered) in the second nibble. Thus possible values for the second nibble are limited to 2, 6, A and E.
In other words
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n=0 --> globally assigned MAC;
n=1 --> locally administered;
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“Y” can be 2, 6, A or E.
So the possible MAC addresses in Windows 7 for wireless adapters:
X2-XX-XX-XX-XX-XX
X6-XX-XX-XX-XX-XX
XA-XX-XX-XX-XX-XX
XE-XX-XX-XX-XX-XX
For the wifi hotspot issue, please check this blog to see if it can be helpful.
Windows 7 Connectivity Problems in Public Hotspots
http://blogs.technet.com/b/patrickr/archive/2010/07/28/windows-7-connectivity-problems-in-public-hotspots.aspx
Kate Li
TechNet Community Support

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ryans-imac:~ Ryan$ ifconfig en1
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
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etresoft wrote:
What you want is the "airport" program, conveniently located at /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resourc es/airport
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Supported arguments:
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-A[<arg>] --associate=[<arg>] Associate to network.
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and if necessary, for a password if the network is using WEP or WPA.
The following additional arguments may be specified with this command:
--bssid=<arg> Specify BSSID to associate with
--password=<arg> Specify a WEP key or WPA password
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-P<arg> --psk=<arg> Create PSK from specified pass phrase and SSID.
The following additional arguments must be specified with this command:
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It's not clear to me which command if any will allow a MAC change

My friend took my macbook pro's MAC address.Can he operate my laptop with it?Can he see what i do?Whats is the solution?If i change the MAC address will it help me? I don't want him to operate my laptop

My friend took my macbook pro's MAC address.Can he operate my laptop with it?Can he see what i do?Whats is the solution?If i change the MAC address will it help me? I don't want him to operate my laptop

Use the trackpad to scroll, thats what it was designed for. The scroll bars automatically disappear when not being used and will appear if you scroll up or down using the trackpad.
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Not sure why you would need to, but here yah go:
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I don't think that's going to be possible. The MAC address is hard wired into each device. Everyone is different. There is no way(at least that I'm aware of) to change it.
There are instances when you can "spoof" a MAC address, but the only place I've seen this was in routers... This allows the router to pretend to be, or spoof, a different MAC address... it doesn't really change it. And note that in this case that router is between the spoofer and the spoofey, so to speak.
I just don't think you'll be able to do what you want the way you want.

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HI,
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