How does the mirror selection work?

How does ppa.quickbuild.pearsoncomputing.net determine which mirror it redirects to? Reason behind my question is that I just tried to install V14 on a local debian machine, and 100% of all file-requests were redirected to tde-mirror.yosemite.net - which isn't even on the same continent. Our own mirror (ftp.fau.de) on the same AS would have been a much saner choice. Or at least a random mirror in Europe. This is not because the mirrors don't have the file. Random example: http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-r14.0.0/debian/p… always redirects both my university-machine and my home-dsl to tde-mirror.yosemite.net even though at least ftp.fau.de and bg1.mirror.trinitydesktop.org have the file in Europe. -- Michael Meier, HPC Services Friedrich-Alexander-Universitaet Erlangen-Nuernberg Regionales Rechenzentrum Erlangen Martensstrasse 1, 91058 Erlangen, Germany Tel.: +49 9131 85-28973, Fax: +49 9131 302941 michael.meier(a)fau.de www.hpc.rrze.fau.de