Makes sense. I don’t think latency is a great issue when transferring large files, I would be more concerned about packet drop. (Unless latency is part of the reason the tracker thinks I’m too slow to bother requesting data from, which would explain why American-based trackers barely let me seed but local ones work great.) The overhead of TCP torrenting is about 3-4 % for me, and even if an IPv6 tunnel increases that to say 25 %, I will be able to use 80 % of my upload bandwidth for seeding, assuming IPv6 allows me to reach enough peers to request 1.6 Mb/s from me, which would be much higher than the current <1 %. My logic was that I could reach people that don’t have a publically reachable IPv4 port but an IPv6 one (because of IPv4 exhaustion of course), but now I understand that this is way less of an impact than I thought.