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Router MAC address cloning - can your ISP tell?

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Router MAC address cloning - can your ISP tell?

Old 01-23-04, 09:52 AM
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Router MAC address cloning - can your ISP tell?

A network admin told me that "any good network admin" etc ... can tell if you are cloning your MAC address through a router.

Is this true?

Can anyone verify this?

It's not like i'm worried but I found this to be an interesting claim as I thought once a MAC address is cloned all the ISP sees is the cloned address.

Thanks.
Old 01-23-04, 10:42 AM
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If it is true, "any good network admin" is not going to be employed by your ISP.
Old 01-23-04, 10:59 AM
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should we care?
my cable company doesnt have any problem with me using a router.. of course, they would prefer to sell me another modem, but they force you to go that route

what business is it of theirs? they are selling you bandwidth, and how you decide to distribute it among your internal network should not be their concern.
Old 01-23-04, 11:07 AM
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Originally posted by TeeSeeJay
If it is true, "any good network admin" is not going to be employed by your ISP.
True!
Old 01-23-04, 11:08 AM
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Generally all they'll get is the MAC and IP addresses.

However, if they have particular types of management software they can interrogate the device further as to its brand and model.
Old 01-23-04, 11:09 AM
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Re: Router MAC address cloning - can your ISP tell?

Originally posted by bill_n_opus
A network admin told me that "any good network admin" etc ... can tell if you are cloning your MAC address through a router.

Is this true?

Can anyone verify this?

It's not like i'm worried but I found this to be an interesting claim as I thought once a MAC address is cloned all the ISP sees is the cloned address.

Thanks.
They may be able to remotely inspect the hardware to determine if it's actually what it's supposed to be. Of course, if they can tell and complained all you would need to do is use the machine that has the "approved" NIC in it as a router.

My ISP doesn't care what's connected to their port, but if they did I'd just give them the MAC address of my Linux firewall... it feeds access to another firewall/router that provides access to the rest of the house.
Old 01-24-04, 09:25 AM
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Thanks.

This fellow "didn't want to give up his secrets" which is fine. I was just curious about how it would be done.

I wondered if they would have some ability to remote analyze a connection in some way. It would make sense to know if someone in a suspicious setting was running a good number of connections for bandwith sharing within a rooming house for students ... or something to that effect.

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