IPv6 torrent tracker not downloading

[T Jeske]

I have an IPv6 only host that I would like to use to torrent the Ubuntu images. I just use the IPv6 tracker https://ipv6.torrent.ubuntu.com/announce. However, I get stuck at "Downloading metadata". I see I am connected to the tracker, I get enough seeds and/or peers listed, but it doesn't proceed any further. 3rd party IPv6-only trackers (e.g. birkenwald.de) work just fine. This has been like this for over a year and I tried different torrent clients (Transmission, qBittorrent) in different versions.

I have no real idea how to debug this. I've read a bit on how the torrent protocol works. Since the tracker uses https it's impossible to track with Wireshark. I suspect there is some problem with the options like IP address etc. sent to the tracker with the announce-URL.

[T Jeske (t-jeske)]

BitTorando - the tracker used by Ubuntu - hasn't received any further development since 2007(!). So no wonder it doesn't handle IPv6-only clients well. But now this is becoming a nuisance.

[Iain Lane (laney)]

Thanks. I've filed a request with the Canonical sysadmins to see if they can look at this and maybe redeploy the tracker onto something else.

(For people at Canonical, the ID is: #129855.)

[T Jeske (t-jeske)]

Hey Iain, have you received any response yet?

[Iain Lane (laney)]

On Thu, Mar 04, 2021 at 12:44:46PM -0000, T Jeske wrote:
> Hey Iain, have you received any response yet?

It's in the queue. When there's something to be reported, it'll be
shared here.

--
Iain Lane [ <email address hidden> ]
Debian Developer [ <email address hidden> ]
Ubuntu Developer [ <email address hidden> ]

[T Jeske (t-jeske)]

Any news on this?

[James Simpson (jsimpso)]

Hi,

We've done some work on this, and as a result I've been able to successfully download several torrents from an IPv6 only host using transmission v3 as a client.

I'll mark this one as resolved, please let us know if you're still experiencing issues.

[T Jeske (t-jeske)]

Hello,

no, the issues are not resolved. Are you sure your test client didn't have any IPv4 connectivity, not even via DNS64/NAT64? Did you also disable PEX/DHT/LSD? I am on a pure IPv6-only system and while the client can contact the IPv6-tracker, it doesn't get any peers. If I add another IPv6-tacker (e.g. http://tracker.datacenterlight.ch:6969/announce), I'll immediately get connected to other peers and downloading starts. I tried this on two different machines in different networks.

Cheers,
t