ipv6 not working

[bleedingedgedebian]

I can't seem to get rtorrent 0.15.1 to bind to my ipv6 interface

rtorrent will not start with network.bind_address.set_ipv6 = "::" in rtorrent.rc (although that may be a relic), it also will not start with network.bind_address.set = "::"

When I try to start rtorrent manually with these lines enabled to investigate I get rtorrent: Failed to parse command line option: Error in option file: /var/lib/rtorrent/rtorrent.rc:33: Could not prepare socket for listening: Address already in use (line 33 corresponds to network.bind_address.set = "::")

rtorrent seems to be binding ipv6 to ipv4 interface

ss -tulpn | grep rtorrent
tcp LISTEN 0 4096 [::ffff:0.0.0.0]:50000 : users:(("rtorrent main",pid=24621,fd=13))

I have confirmed this behaviour in these builds:

https://archlinux.org/packages/extra/x86_64/rtorrent/
https://aur.archlinux.org/packages/rtorrent-ipv6

Might I be missing something, using bad builds, wrong config, etc.?

[rakshasa]

You should be using network.prefer.ipv6.set = true, not sure if binding to :: works properly.

I started working on ipv4/6 handling a few years before taking a hiatus, so much of that code is partially done.

[bleedingedgedebian]

Thanks for your reply. rtorrent at least starts with network.prefer.ipv6.set = true unlike other things I tried but still does not report ipv6 to trackers and therefore never establishes connections over ipv6 (from a known good host with known good networking). but if ipv6 is not expected to work currently that is all I need to know!

that said, kindly advise if any other parameters need to be set for this to work if ipv6 is even partially functional. thanks for picking this project back up, been trying to fund you when I can.

[rakshasa]

IIRC you need can bind to the specific ipv6 address you want to use.

Probably going to review the current code and figure out what needs fixing over the next few months.

[bleedingedgedebian]

Your feedback has been helpful. Thanks again.