I have an IPv6 and IPv4 network which I’ve been using without any issues.
I run Home Assistant on Home Assistant Yellow.
I’m interested in trying out some Matter and Thread devices - however, I’ve read that IPv6 needs to be turned on and working in Home Assistant for Matter and Thread to work.
When IPv6 is activated in Home Assistant:
System > Network > Configure network interfaces > IPv6 > Automatic
My Home Assistant has the following IPs:
192.168.0.75/24 (Static DHCPv4)
2a02:XXXX:XXXX:1::1000:75/128 (Static DHCPv6)
2a02:XXXX:XXXX:1:XXXX:XXXX:XXXX:XXXX/64 (Router Advertisements)
fd5a:XXXX:XXXX:1:XXXX:XXXX:XXXX:XXXX/64 (ULA Router Advertisements)
fe80::XXXX:XXXX:XXXX:XXXX/64 (Link Local Address)
When I restart Home Assistant with IPv6 activated, I get the following errors in my logs:
Logger: hass_nabucasa.remote
Source: runner.py:188
First occurred: 15:24:50 (3 occurrences)
Last logged: 15:26:10
Can't update remote details from Home Assistant cloud (timeout)
Having investigated docs on Nabu Casa here: Troubleshooting.
This super helpfully explains that this error “indicates a network issue” and “a bad IPv6 network configuration”.
The docs go on to suggest checking your IPv6 connection using test-ipv6.com which I did:
The suggested solution is to just disable IPv6, which isn’t very helpful.
In addition, HACS throws the following error:
This error originated from a custom integration.
Logger: custom_components.hacs
Source: custom_components/hacs/base.py:464
Integration: HACS (documentation, issues)
First occurred: 15:25:03 (1 occurrences)
Last logged: 15:25:03
Timeout of 20 reached while waiting for https://api.github.com/rate_limit
Traceback (most recent call last):
File "/config/custom_components/hacs/base.py", line 464, in async_can_update
response = await self.async_github_api_method(self.githubapi.rate_limit)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/hacs/base.py", line 522, in async_github_api_method
raise HacsException(_exception)
custom_components.hacs.exceptions.HacsException: Timeout of 20 reached while waiting for https://api.github.com/rate_limit
And these integrations won’t start, some of these are custom integrations (sensor.feedparser, localtuya) but why would ZHA not start - how would this be affected by IPv6?
Logger: homeassistant.bootstrap
Source: bootstrap.py:513
First occurred: 15:25:28 (2 occurrences)
Last logged: 15:26:28
Waiting on integrations to complete setup: sensor.feedparser, zha, localtuya, surepetcare, openuv
Is anyone else having these kind of issues with IPv6 on Home Assistant? Or am I just lucky? I couldn’t find much information out there 
so not sure how to proceed.