How can NAT be detected by an ISP?

Question

Hey

My home ISP provides internet via LAN, which is not common practice for individual home users. My subscription plan doesn't allow me to share the connection on more than one PC. Until recently this rule was somewhat guarded by the TTL parameter of the packets reaching my machine - it was set to only 1. Now that the TTL is 64 if I connect a router and mask it with my computers mMAC address I should be able to share the connection through a NAT.. However since the different subscription plans have different number of maximum allowed PCs by what means the ISP can sense I am using more than one PC and even the number of machines. Maybe by the TTL of the packets that I send? Please shed some light. Thanks in advance.

Answer 1

I take it that your ISP's router is your NAT server. If this is so, each PC has a computer ID and an IP address.

If you are using a Windws Server say 2003 and NAT enabled through Routing and Remote Access Server, then your ISP would only see one IP address assigned. The Windows server would assign the IP addresses to the clients and the public interface would be all your ISP sees.

I hope this helps

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Answer 2

each comp has an individual IP addy