IPv6 on FreeBSD
ifconfig_em0_ipv6="<IP>"
ifconfig_vtnet0_aliases="inet6 <IP> prefixlen 64"
ifconfig_vtnet0_ipv6="inet6 accept_rtadv"
ipv6_default_interface="em0"
ipv6_defaultrouter="fe80::1%em0"
rtsold_enable="YES"
ifconfig_em0_ipv6="<IP>"
ifconfig_vtnet0_aliases="inet6 <IP> prefixlen 64"
ifconfig_vtnet0_ipv6="inet6 accept_rtadv"
ipv6_default_interface="em0"
ipv6_defaultrouter="fe80::1%em0"
rtsold_enable="YES"