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Originally Posted by TheNorm
Nice analogy, but wouldn't it be more accurate if you replaced "letter" with "postcard"? And it wouldn't be the postman having a look, but the sorting office. I'm not sure that any laws would then be broken.
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Not really
http://en.wikipedia.org/wiki/Transmi...ntrol_Protocol
TCP, the main transmission protocol we are talking about here to use the wiki words
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The Internet Protocol (IP) works by exchanging groups of information called packets. Packets are short sequences of bytes consisting of a header and a body. The header describes the packet's destination, which routers on the Internet use to pass the packet along, generally in the right direction, until it arrives at its final destination. The body contains the application data.
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So a TCP packet contains an envelope or header which everyone needs to read, and a private body (though the privacy is about as strong as a paper envelope). Thus at the moment the header should be the only part that is read (it is all the router needs to read), but now the body will be looked at too.