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AceH
Posts: 137
Registered: ‎03-10-2008
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Advantage of cloning the MAC Address?

What's the advantage of cloning the MAC Address?

AceH
Posts: 137
Registered: ‎03-10-2008

Re: Advantage of cloning the MAC Address?

Excuse what may be a "dumb" question but I have 2 laptop computers which are used wirelessly via my WRT54G2 router and one desktop which is connected to the router via the ethernet cable.  Since all three have different MAC addresses, which one should I use to clone the MAC address?

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kent07
Posts: 411
Registered: ‎09-17-2008

Re: Advantage of cloning the MAC Address?

Clone the one that has internet access when connected to the modem.

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Expert
Posts: 12,649
Registered: ‎07-16-2006

Re: Advantage of cloning the MAC Address?

There is no "advantage" of cloning the MAC address. The only advantage would be to have internet or not.

In many cases, it is absolutely unnecessary to use the MAC address clone.If you have a working internet connection through your router then there is no need to use the MAC address clone function.

Only when you find that you have a working internet connection on one computer directly on your modem but not when you connect through the router (or a different computer directly on the modem) then it is necessary to use the MAC address clone function.

This usually is only the case with cable TV ISPs. They only allow you to have a single active internet connection at any time. They do this by remembering the MAC address which connects through a specific modem. If you first connect a computer for tests directly to your modem you'll have an internet connection. Now if you connect a different device to your modem it doesn't it's because the ISP has still locked the internet connection for the MAC address of the first computer.

How to remove the lock depends on the ISP and the modem. Sometimes it's enough to reset the modem or to power down everything. Sometimes you have to power down everything for a few hours and after that the first connecting device is the one with the internet connection (i.e. make sure to connect the router then...) If you want to know exactly how your ISP does this you should ask them...

The simple workaround is to use the MAC address clone function. The router "clones" the MAC address of the first computer, i.e. it basically pretends to be that computer. The MAC address is accepted by the ISP and is immediately allowed to the network. You have a working internet connection either directly on the first computer or through the router because both use the same MAC address. (It's no problem on the router because the MAC address is used on the internet port only...).

Of course, you have to remember all this. If at some later time you connect a different computer directly to the modem (e.g. you have connection problems and you want to find out what's wrong) you may "lock" in a different MAC address for your connection and you'll have to wait again to regain the connection for a different device.

But again: there is absolutely no need to use the clone function if you have a working internet connection through your router.
AceH
Posts: 137
Registered: ‎03-10-2008

Re: Advantage of cloning the MAC Address?

Thanks.  That was very good information whcih I did not know.  I had no problem connecting to the Internet but I thought there was some advantage in cloning the MAC addres so I did.  Will I run into "trouble" (i.,e. Internet connection problems) if I DISABLE that function?

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Expert
Posts: 12,649
Registered: ‎07-16-2006

Re: Advantage of cloning the MAC Address?

As long as you have a working internet connection you can disable the function.
AceH
Posts: 137
Registered: ‎03-10-2008

Re: Advantage of cloning the MAC Address?

Thanks again.

matz
Posts: 1
Registered: ‎04-15-2012

Re: Advantage of cloning the MAC Address?

anyone can help me how to prevent cisco swicth cloning??

reply asap i need for my study.thanks....

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Expert
Posts: 12,649
Registered: ‎07-16-2006

Re: Advantage of cloning the MAC Address?

Define "cisco swicth cloning".
somms
Posts: 129
Registered: ‎03-20-2008

Re: Advantage of cloning the MAC Address?

[ Edited ]

http://www.dd-wrt.com/wiki/index.php/MAC_Address_Clone

 

I have cloned the wireless MAC address several times in order to be issued a new IP address via my Comcast HSI so in my opinion there is a definite advantage to doing this!:smileywink:



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