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  • Note that you can't download a single file (or web page) on multiple interfaces (unless the server you are contacting uses a multi-homing protocol like SCTP, but that's unlikely). You can download several files at the same time on different interfaces via different HTTP connections, though. Commented Nov 19, 2018 at 8:03
  • Why did you decide so? My client has multiple interfaces, what could prevent it to create several sockets bound to different addresses, connect them to the server and download different ‘range’ of file? Please explain Commented Nov 19, 2018 at 8:07
  • Because standard TCP and UDP protocols are single homed. Every connection must go through a specific interface, because you can only have a single IP address at each end. That's how the protocol works. So multiple interfaces won't make "your internet faster" (though many people wish this, this is a FAQ). The best you can do is to more or less randomly distribute connections among your interfaces. Or do a failover. Commented Nov 19, 2018 at 8:14
  • Of course you can write an application to download different parts of some file via HTTP on several connections, if the server supports it, but you must explicitly do so, and decide on the ranges, and I don't know any application that already does it. You could use bittorrent, which already makes use of many connections, but not HTTP. And bittorrent won't help with measuring speed. Commented Nov 19, 2018 at 8:16
  • ‘Every connection goes through a specific interface’ - correct. ‘Use of multiple interfaces won’t make overall speed faster’ - incorrect. Think again ))) Commented Nov 19, 2018 at 8:17