HP VPN Firewall Appliances Network Management Configuration Guide

678
Figure 358 Converting a MAC address into an EUI-64 address-based interface identifier
• On a tunnel interface
The lower 32 bits of the EUI-64 address-based interface identifier are the source IPv4 address of
the tunnel interface. The higher 32 bits of the EUI-64 address-based interface identifier of an
ISATAP tunnel interface are 0000:5EFE, whereas those of other tunnel interfaces are all zeros. For
more information about tunnels, see VPN Configuration Guide.
• On an interface of another type (such as a serial interface)
The EUI-64 address-based interface identifier is generated randomly by the device.
IPv6 neighbor discovery protocol
The IPv6 Neighbor Discovery (ND) protocol uses the following ICMPv6 messages:
Table 76 ICMPv6 messages used by ND
ICMPv6 messa
g
e T
yp
e Function
Neighbor Solicitation (NS)
message
135
Acquires the link-layer address of a neighbor.
Verifies whether a neighbor is reachable.
Detects duplicate addresses.
Neighbor Advertisement
(NA) message
136
Responds to an NS message.
Notifies the neighboring nodes of link layer changes.
Router Solicitation (RS)
message
133
Requests an address prefix and other configuration information
for autoconfiguration after startup.
Router Advertisement (RA)
message
134
Responds to an RS message.
Advertises information, such as the Prefix Information options
and flag bits.
Redirect message 137
Informs the source host of a better next hop on the path to a
particular destination when certain conditions are met.
Address resolution
This function is similar to the ARP function in IPv4. An IPv6 node acquires the link-layer addresses of
neighboring nodes on the same link through NS and NA message exchanges. Figure 359 shows how
Host A acquires the link
-layer address of Host B on a single link.