There is no ipv6
module in /etc/modules.d/
I tried uncommenting the alias line anyway, but it didn't have any effect (as expected)Edit
: I figured it out. Sabayon apparently doesn't use the alias, blacklist, etc. files directly on their own -- after adding the blacklist ipv6
line to /etc/modprobe.d/blacklist
I had to run update-modules
. After rebooting, ipv6 is no longer active.
Though, that still doesn't explain why I had it after a fresh install and you didn't...