Dell Latitude E6320 (Early 2011) - Manual (Page 36)

ENABLED, select 'Enabled' and press <Enter>.
IPv6 Feature Selection enabled as more configuration allowed.
2. IPv6 Interface ID Type
Under the Wired LAN IPv6 Configuration select IPv6 Interface ID Type and press <Enter>.
The auto-configured IPv6 address consists of two parts, the IPv6 Prefix set by the IPv6 router is the first and the interface ID
is following part (64 bits each).
Option Description