In the sb blacklist file the format looks to be: blacklist ipv6
Did you look in /etc/modules.d/ to see if there is an ipv6 module in there? If there is an ipv6 module then we can try to block it in the /etc/modules.d/aliases by uncommenting the following line:
# alias net-pf-10 off # IPv6
by removing the "#" symbol from the start of the line.
I don't know why after a fresh install of sb 3.4f, that you would have ipv6 & I don't?
Perhaps someone who does know will explain it to us?
