Ben said:But this is not for alias configuration. This is to assign an IPv6 address, right?
ifconfig_<NIC>_alias0="inet6 XXXX:XXXX:XXXX:XXXX::X"
ipv6_addrs_re0="2001:db8:1111:2222::1/64 2001:db8:1111:2222::2/64 "
ipv6_addrs_re0="2001:db8:1111:2222::1 prefixlen 64"
ipv6_addrs_re0="2001:db8:1111:2222::1-4/64"