Comment 5 for bug 1732002

I've got a branch which would have cloud-init disable accept-ra unless cloud-init has an explicit ipv6 configuration (static or dhcp6). This only affects the solicitation effort, ipv6 link-local is of course, unaffected as is explicit ipv6 configuration. I believe LXD is in a position to know if it has an ipv6 enabled bridge; it could control the template to use a dhcp6 config instead of dhcp (which is ipv4) and not the unconfigured IPV6 RA, which on older releases like Xenial and Trusty won't see without configuration anyhow.

https://code.launchpad.net/~raharper/cloud-init/+git/cloud-init/+merge/339437