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 bear73Metnav... Fly The Unfriendly SkiesPremium
join:2001-06-09
Grand Forks Afb, ND | reply to Kearnstd
Re: Devil's advocate Yes TCPIP has designed into it a method for telling the server that particular bits did not reach their destination. That is a core part of the stack. Without it the internet wouldn't work. As for how the provider is measuring, they're using the simplest method, which is to look at what they send to you including all the retransmits and calling that your requested data. Even if you have a dinosaur phone that can't do internet like mine but just attempts to start a browser app that times out and fails. I have had to fight verizon multiple times that I don't have a phone that does internet. I had to go so far as go to a verizon store and get the manager to look at my phone, verify it CANNOT do mobile web and then put a note on my account to the same. | |
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| said by bear73:Yes TCPIP has designed into it a method for telling the server that particular bits did not reach their destination. That is a core part of the stack. Without it the internet wouldn't work.
The endpoints of a TCP conversation know if a packet was received. The routers between those endpoints do not know, or care, all they do is pass along the packet (if the relevant connection isn't congested) or drop it (if it is and the queue is full). Even NAT devices don't account for lost packets, they only track the state of the connection, it's still up to the endpoints to verify that the packet wasn't lost.
That's TCP, most other Layer 4 protocols (UDP, ICMP, etc) have no mechanism to deal with lost packets, they leave it up to the application using them for transport. | |
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