rnal to a host. Introduction to IPv6 Table 3.3 IPv6 address selection default policy table Prefix Precedence Label Description ::1/128 IPv6 loopback address [4] Global IPv6 addresses [4] ::ffff:0:0:/96 IPv4-mapped IPv6 addresses [4] 2002::/16 6to4 addresses [66] 2001::/32 Teredo addresses [14] fc00::/7 ULA addresses [7] ::/96 IPv4-compatible IPv6 addresses (deprecated) [4] fec0::/10 Site-local addresses (deprecated) [4] 3ffe::/16 6bone addresses (phased out) [93] 2. Prefer a source address with the same or higher scope as the destination address. For example, prefer a global scope source address when a destination is also of global scope. 3. Avoid deprecated addresses, if preferred addresses are available (see Section 3.5.1). 4. Prefer a Mobile IP Home Address (HoA) over a Care-of Address (CoA) (see Section 3.7.2). Prefer addresses from the interface that will be used to send a packet to a given destination. 6. Prefer a matching label. This means, for example, that 6to4 source addresses are preferred when the destination address is also 6to4 address. 7. Prefer temporary addresses over public addresses, by default (see Section 3.5.5). 8. Prefer a source address that has the longest matching prefix with the destination address. Destination Address Selection The algorithm for prioritizing a list of destination addresses uses the source address selection algorithm, described above, to find out what source address the host would use to communicate to a given destination address. The rules for prioritizing destination addresses are briefly the following, in priority order: 1. Avoid unusable destination addresses: these destination addresses may be such for which a host does not have suitable source addresses available, or destination addresses that are known to be unreachable. 2. Prefer addresses with matching scope: a destination address is preferred if a host has a source address available with the same scope. 3. Avoid deprecated source addresses: a destination address is preferred for which a host has a non-deprecat