It uses link-local ipv6 multicast to distribute ipv4 and ipv6 addresses, ntp and name server information. It differs from dhcp and dhcpv6 in that it:
Uses one packet to distribute ipv4 and ipv6 information (dhcp and dhcpv6
require separate and more packets each)
Distributes point to point addresses (/32 ipv4 and /128 ipv6)
Lacks the backward compatability cruft in dhcp and dhcpv6
For more information, including the current specification and rfc, please see the ahcp web site .