B. Autoconfiguration
State-Less Address Auto Configuration (SLAAC) [7] is a
distinguishing feature of IPv6. However, SLAAC also raises
serious security concerns. One of the concerns about SLAAC is
its trust model with respect to the network trusting a node that
autoconfigures itself [8]. A node can acquire a link-local address
and subsequently a globally routable address without any
approval or control. A new IPv6 node that autoconfigures itself
is allowed an unchecked access to the link. This unchecked
access is not limited to the local link because a node can subsequently
acquire a global prefix using solicitation and advertisement
ICMPv6 messages for Neighbor Discovery (ND) [9].
Combining the global prefix with the link local address, the
node can construct a globally routable address and start using it
without any approval or control.