Fwiw I tried irtt with a similar setup, using hosts defined in /etc/hosts with both IPv4 and IPv6 addresses:

10.72.0.230	apu2a_6
a::601		apu2a_6
10.72.0.233	apu2c_6
a::603		apu2c_6

All of the following worked as expected:
```
sysadmin@apu2a:~$ irtt client -n apu2c_6
[Connecting] connecting to apu2c_6
[10.72.0.233:2112] [Connected] connection established
[10.72.0.233:2112] [NoTest] skipping test at user request
sysadmin@apu2a:~$ irtt client -6 -n apu2c_6
[Connecting] connecting to apu2c_6
[[a::603]:2112] [Connected] connection established
[[a::603]:2112] [NoTest] skipping test at user request
sysadmin@apu2a:~$ irtt client --local=apu2a_6 -n apu2c_6
[Connecting] connecting to apu2c_6
[10.72.0.233:2112] [Connected] connection established
[10.72.0.233:2112] [NoTest] skipping test at user request
sysadmin@apu2a:~$ irtt client --local=apu2a_6 -6 -n apu2c_6
[Connecting] connecting to apu2c_6
[[a::603]:2112] [Connected] connection established
[[a::603]:2112] [NoTest] skipping test at user request
```

Do those commands work for you outside of flent from your mn.h1 to mn.h2? I also wonder what happens if you don't use `--local-bind`.

Lastly, I realized we'll have to bracket the local bind address as well if it's an IPv6 literal, but that's not affecting you here because you're using a hostname.

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