Will NAT hide your machines if a person is REALLY looking for them?
Posted on 2005-04-25
The ISP that provides cable internet access in my area has a policy that only allows you to have one computer on the network. If you have more than one computer on the network then you have to pay an extra $10.00 fee.
I have been arguing with a couple friends about this. I say that if you have a router that does NAT then there is no way that they would know if you had more than one computer on the network.
My friends say that is wrong. That even when using NAT certain info that relates to things like OS version and MAC address still can go through the router and that ISPs have automated ways of looking for this stuff. It sounds like bull to me but they swear that they know people who had NAT boxes set up who ended up getting busted by their ISP. The only time that their argument begins to sway me is when they point out "if NAT hides your machines then why would people set up Linux machines to do IP Masquerade rather than just plain old NAT?"
So what is the true story on this?