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Our primary network metric is latency and therefore the closest network distance is typically the closest node geographically but there are situations where ineffecient fiber routing or cuts could lead to you being served by a node further away. Do note how 'closest' is not measured geographically but rather by what our networks thinks is the closest location. Tele2 speedtest service utilizes this to send you to the closest location in our network. Sparse files, such as the ones provided here via HTTP and FTP, can be created with something along the lines of: dd if=/dev/zero of=my_large_file bs=1 count=0 seek=10GĪnycasting is a technique where a single IP address is used in multiple locations in a network and packets are sent to the closest server. TCP windows have been slightly tweaked to support higher throughput. A small script called cleandir is used to clean the upload directory of the FTP server to avoid filling the file system with temporary uploaded files. Debian Linux is the operating system used, nginx for serving web pages and sparse files via HTTP and vsftpd is used for FTP. Each location consists of a 1U Supermicro server with an octacore Xeon E3-1240 V2 running at 3.4GHz, 32GB of RAM and an Intel 10GE NIC (82579LM chip). This page and the listed speedtest services are hosted on a number of servers spread through Europe (see locations).

Ookla speed test free download for android