Do ISPs charge for packet loss / retransmission ?
I have a question that I have been trying to answer by trawling the interweb but with little success. The question is, Do ISPs charge end users for packet loss or retransmission data ?
Here is a scenario : a friend of mine (cough, cough) has a 1Mbs mobile broadband connection with company X and a 1Gb per Month download limit. He checks the usage one day and finds he has used 500Mb. He decides to download a file of size 300Mb, well within the limit.
The download proceeds but the speed reduces (gradually) from approx. 350Kbs to 1 - 2Kbs. He checks the download history and finds that package loss / retransmission requests are about 50 to 60%.
He gets distracted and returns to the computer the next day to find the download is still going (barely) but is nowhere near finishing. He switches off the computer and kicks the cat.
A couple of days later he receives the monthly bill from company X (for the period in question) and is horrified to see excess usage charges for 200Mb of data over and above his 1Gb limit.
Does this mean that the due to package loss / retransmission / congestion etc his ISP has charged him for 700Mb of data even though the download size of the file was only 300Mb. Is this normal ?