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Old 07-04-2004, 15:43   #21
rdhw
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Join Date: Oct 2003
Location: Cambridge
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Re: What NTL know....

Quote:
Originally Posted by monkeybreath
if they were to inspect the packets that were coming from your network, would they not be able to see the mac address of the source machine, and therefore be able to see if they were picking up 4/5/6 different mac addresses?
The MAC address that NTL sees is the MAC address of the WAN port of your router, which will be the same for all PCs connected behind the router.

However, it is usually possible to figure out which customer is using a router by the characterisitics of the DHCP requests that the router makes. Plus, if you don't clone the MAC address of the WAN port of the router, each default MAC address identifies its manufacturer, so you can see which router is a Linksys, which a Netgear, which a D-link, and so on.

But is still isn't very easy for an ISP to tell exactly how many PCs are behind a router.
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