>Perhaps a workaround would be to detect IPv6 addresses using Python's ipaddress module and surround it with brackets if necessary before passing it to irtt? I could add that to flent at some point if so...

That'd be very helpful for the moment!
I am also having troubles with other tests, e.g., `rrul46compete`, because it seems sometimes a device interface must be appended to the IPv6 for the apps to work, and sometimes it doesn't, as I'm working with link-local address spaces (i.e., `a::b%dev1` instead of `a::b`).
That may be related to the irtt issue, but maybe it's a whole new issue of its own. (If there is no quick fix for that, I could try to use other IPv6 spaces, but that doesn't help with the issue itself)

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