This is information in my servers:
'> ip -6 addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 fe80::ff:fe18:46a2/64 scope link
valid_lft forever preferred_lft forever
You must edit custom.defaults.conf.tpl and custom.domains.conf.tpl.