<div dir="ltr"><div>@Nils</div><div><br></div>Tor path selection avoids using relays from the same /16 subnet, and I thought it considered the Autonomous System (AS) as well. However now I'm not finding concrete evidence that path selection looks at AS. I found some older academic papers on the subject [1], but nothing in the current specification [2].<br><div class="gmail_extra"><br></div><div class="gmail_extra">Avoiding using two nodes from the same AS would seemingly go a long way toward mitigating the attack vector you mentioned though.</div><div class="gmail_extra"><br></div><div class="gmail_extra">1) <a href="http://freehaven.net/anonbib/cache/DBLP:conf/ccs/EdmanS09.pdf">http://freehaven.net/anonbib/cache/DBLP:conf/ccs/EdmanS09.pdf</a></div><div class="gmail_extra"><br></div><div class="gmail_extra">2) <a href="https://gitweb.torproject.org/torspec.git/plain/path-spec.txt">https://gitweb.torproject.org/torspec.git/plain/path-spec.txt</a></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div></div>