ISP Monitoring

An ISP, or Internet Service Provider, is the entity that connects a client, such as a desktop or mobile device, to the Internet.

Step 1	Data sent from the client travels to the ISP.
Step 2	The ISP routes the data to the destination by examining the destination address. If the address is local to the ISP it is sent directly. More likely the address is somewhere else to the data must enter the cloud. In reality this is done with peering arrangements, network access points (NAP), or Internet exchange points (IXP or IX).
Step 3	Data is returned to the ISP.
Step 4	Data is delivered to the client.

Since all data is passing through the ISP they have potential to examine everything. They can modify, reject, or redirect anything they choose.

A way the ISP’s power comes into reality for some is those that force you to use their outgoing email servers. This is done to limit the possibility that you have a virus on your machine that will send out mass mailing.

In many regions in the world the ISP, for their own purposes or required by law, log vast amounts of data about what you are doing through the service they provide. This logging frequently includes the domain names and IP addresses you visited and when.

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