Can you ISP tell the MAC address of all the computers on your network?

Hello,

Can your Local ISP tell the MAC address of all the computers on your network? Or is it just the address of your modem or router?
Our network goes....ISP's Modem (rented), Linksys 3000 router, 3 local computers, 4 wireless devices.

Thank you.
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tfsaccountAsked:
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ecdmonkeyCommented:
As your devices are all connected to a router your isp will not be able to see the MAC address's of your devices.

Your isp may see the MAC of the modem, the modem will see the MAC of the Linksys and the Linksys will see the MAC's of your devices.

hope that makes sense
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Ernie BeekExpertCommented:
As a packet traverses a network or series of networks, the source MAC address is always that of the network interface card (NIC) that placed it on the media, and the destination MAC address is that of the NIC that is intended to pull it off the media. In a routed network, this means that the source and destination MAC address changes with each hop through a network-layer device (a router or a layer-3 switch). Therefore, two packets with the same source or destination address at the IP level can contain different MAC addresses, depending on the path the packet takes through the network.
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tfsaccountAuthor Commented:
SO, they can only tell the MAC address of the Modem?
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Ernie BeekExpertCommented:
Correct, and only if they are on the device at their end where you modem connects to.
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tfsaccountAuthor Commented:
Thank you.
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ecdmonkeyCommented:
tfsaccount:
SO, they can only tell the MAC address of the Modem?

yes  :)
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Ernie BeekExpertCommented:
Glad I could help :)
Thx for the points.
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