Introduction To Ipv6 Neighbor Discovery Protocol - 3Com S7906E Configuration Manual

Figure 1-2 Convert a MAC address into an EUI-64 interface identifier
Tunnel interfaces: The lower 32 bits of the interface identifier are the source IPv4 address of the
tunnel interface. The higher 32 bits of the interface identifier of an ISATAP tunnel interface are
0000:5EFE, while those of other tunnel interfaces are all zeros. For more information about tunnels,
refer to Tunneling Configuration in the IP Services Volume.
Other interfaces (such as serial interface): The interface identifier is generated randomly by the
device.

Introduction to IPv6 Neighbor Discovery Protocol

The IPv6 Neighbor Discovery Protocol (NDP) uses five types of ICMPv6 messages to implement the
following functions:
Address resolution
Neighbor reachability detection
Duplicate address detection
Router/prefix discovery and address autoconfiguration
Redirection
Table 1-3 lists the types and functions of ICMPv6 messages used by the NDP.
Table 1-3 Types and functions of ICMPv6 messages
ICMPv6 message
Neighbor solicitation (NS)
message
Neighbor advertisement
(NA) message
Router solicitation (RS)
message
Router advertisement
(RA) message
Number
Used to acquire the link-layer address of a neighbor
135
Used to verify whether the neighbor is reachable
Used to perform a duplicate address detection
Used to respond to an NS message
When the link layer changes, the local node initiates an
136
NA message to notify neighbor nodes of the node
information change.
After started, a node sends an RS message to request
the router for an address prefix and other configuration
133
information for the purpose of autoconfiguration.
Used to respond to an RS message
With the RA message suppression disabled, the router
134
regularly sends an RA message containing information
such as prefix information options and flag bits.
1-6
Function