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IPv6 Overview
118428-A Rev. A 1-27
• The hop-by-hop extension header contains optional information that must be
examined by all intermediate IPv6 routers between the source and the
destination.
• The end-to-end extension header contains optional information that must be
examined by the destination node.
Neighbor Discovery
Neighbor discovery (ND) allows IPv6 nodes on the same link to discover link
layer addresses and to obtain and advertise various network parameters and
reachability information. ND combines the services provided for IPv4 by the
Address Resolution Protocol (ARP) and router discovery.
Address Autoconfiguration
Typically, to start the process of autoconfiguration, a node
• Self-configures a link-local address to use temporarily. The host can form this
address by adding a generic local address prefix to a unique token (typically,
the host’s IEE LAN interface address).
• Sends out an ND message to the address to ensure that it is unique. If no ND
message comes back, the address is unique. If a message comes back
indicating that the link-local address is already in use, the host uses a different
token (for example, an administrative token or a randomly generated token).
• Uses the IPv6 multicast service to send out an ND router solicitation request,
using the new link-local address as a source address. Unlike the broadcast
ARPs of IPv4, ND multicast solicitations are not necessarily processed by all
nodes on the link. IPv6 defines several permanent multicast groups for finding
resources on a local node or link, including an all-routers group, an all-hosts
group, and a Dynamic Host Configuration Protocol (DHCP) server group.
Routers respond to the solicitation messages from hosts with a unique router
advertisement that includes prefix information indicating a valid range of
addresses for the subnet. Routers can also send these advertisements periodically
to local multicast groups, whether or not they receive solicitations.
Using the router advertisement message that it sends in response to a solicitation
from a host, an IPv6 router can control whether the host uses stateful or stateless
autoconfiguration.
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