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One thing about public WLAN and dynamic IP


Kimmo Huosionmaa

I must say that this writing is the continue for the last one, and the thing is about the IP-address. The IP-address is the thing, what the Internet uses for finding or specify the computer, where the data should be sent. And this thing is the thing, what client computer sends to the server before the server can start the data transfer. The server needs the static IP-address because other computers must find it over the network. And the homepages would link the data by using the IP-address.

The reason, why we cannot install the static IP-address for our home computers is that Internet service providers deny that action, and the reason for that is the streaming films or something like that from own server to the fellows is using so much bandwidth, that the service providers have normally locked that option, and they change the IP-address at least once per 24 hours. And there is another reason for that, what is not so well known. The thing is that the service providers have a limited number of IP-addresses and that means, they must release those addresses simultaneous, that the new devices can connect to the Internet.

But the major reason is that the material, what is prohibited to share would easily be shared from own server. The static IP normally pays extra money, and that's why most users use dynamic IP-where the IP-address changes in the time period. The payment for static IP normally guarantees more high uploading speed, and in dynamic IP the download speed is very high, but uploading speed is slower. Many people believe, that dynamic IP makes possible to surf anonymously on the internet, but the problem is that the network changes the IP by using the MAC-address of the computer.

And this means that the monitoring computer can easily track those computers if they are in the list of that machine. And changing MAC-address don't help, because the computer must get the new one from the net, and that would cause, that the tracking computer would just get information, that the new MAC-address is in use, and actually the new MAC-address can be given by the tracking server. The dynamic IP-might seem safe, but actually in the network might be a list of those IP:s to send the computer, what is under surveillance.

So those IP:s might be actually the same IP, what is send in the original session. Public networks might also seem perfect place for hiding the identity of the user, but the anonymous use by using them is actually allowed only if the service provider would give permission for that, because public WLAN:s are not meant for the support the communication of the terrorists, and as I just wrote in the text below this, that service provider can collect the information by using surveillance cameras about the person, who is using a computer.
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