PS: Think of your room/housemate and neighbours, who share the bandwidth and will notice that their “internet is slow again today” when you are doing your tests. Again, you would ideally run it on another computer that you put on the same network as your “download test sink.“ Such a measurement should be rather objective. You can use Wireshark in a pure observer mode to monitor your upload/download traffic and generate the traffic itself by contacting several (geographically separated) servers with other tools (like you did) in order to try to saturate your DSL link. Sites like and upload and download a file to your computer and record how quickly these transfers are performed. Your tool may be buggy, because it counts (to be fast and efficient, without decoding/unpacking) incoming packets regardless of their destination or origin, thus assuming that unrelated traffic is a result of its own test traffic.You will influence the behaviour of your host and at least some of the network components which are used by the running download.It may give wrong results for two reasons. Run a free internet speed test to start to get a sense of where your download and upload speeds are. Nobody would do this in professional context (I hope) or at least draw conclusions very carefully from the measurements. You are monitoring the system under observation with a tool running on the system itself. There are many different network components involved, which have different wire speed and buffer size, and you share them with “the Internet” typically … which you cannot control. You are downloading from a remote server (), probably not located in your room, building, city, maybe not even state or continent. Thus upload and download are not totally separate(able) traffic. You can also google ‘Internet speed test’ and use their built-in tool to run speed test. And in a few seconds the online tool will gauge your upload and download speed and show it to you. Go to the Ookla speedtest website and click the ‘Go’ button. every packet that is received by your HTTP client is also acknowledged to the server. The difference between download speeds and upload speeds can be explained in the following way: download speed refers to the rate that digital data is. Speedtest by Ookla is one of the most popular speed test you can use online. You are downloading through HTTP, which is a TCP/IP protocol. However, you also ask “How can this be possible?”, and I can give you some possibilities. Not knowing the details of your setup, it is difficult to answer the question “why” with certainty.
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