If you are using IPv6, you must manually configure the address. Typically, at least the following two types of addresses must be configured:
A link-local address is of the form fe80::64-bit interface ID/10. The /10 indicates a prefix length of 10 bits.
A global unicast address is based off a 64–bit prefix that the administrator configures for each subnet, and a 64-bit interface ID. The prefix can also be obtained by running the ifconfig command with the -a6 option on any system on the same subnet that has been configured to use IPv6.
The 64–bit interface ID is typically derived from a system's MAC address. For zones use, an alternate address that is unique can be derived from the global zone's IPv4 address as follows:
16 bits of zero:upper 16 bits of IPv4 address:lower 16 bits of IPv4 address:a zone-unique number
For example, if the global zone's IPv4 address is 192.168.200.10, a suitable link-local address for a non-global zone using a zone-unique number of 1 is fe80::c0a8:c80a:1/10. If the global prefix in use on that subnet is 2001:0db8:aabb:ccdd/64, a unique global unicast address for the same non-global zone is 2001:0db8:aabb:ccdd::c0a8:c80a:1/64. Note that you must specify a prefix length when configuring an IPv6 address.
For more information about link-local and global unicast addresses, see the inet6(7P) ma page.