#885 mentioned Trellis is not ready for IPv6 in production. There are no ip6tables settings.
Support for IPv6 in Letsencrypt challenges added in #936
Maybe related: https://github.com/roots/trellis/blob/f8349d661224a2d468c2ce8128fa5fb1f95c8027/group_vars/all/main.yml#L12
Question: How far Trellis is from IPv6-ready for production?