16 n Handbook of IPv4 to IPv6 Transition
When in a deprecated state, the use of the address is discouraged, although it
is not forbidden. However, when possible, any new communication (e.g., the open
-
ing of a new TCP connection) must use a preferred address. A deprecated address
should only be used by applications that already used it before and if it is difficult to
change this address to another address without causing a service interruption.
To ensure that allocated addresses (granted either by manual mechanisms or
by autoconfiguration) are unique in a specific link, the link duplicated addresses
detection algorithm is used. e address to which the duplicated address detection
algorithm is applied is designated (until the end of this algorithm ...