F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100
671
of a solicited-node multicast address is FF02:0:0:0:0:1:FFXX:XXXX. FF02:0:0:0:0:1:FF is fixed and
consists of 104 bits, and XX:XXXX is the last 24 bits of an IPv6 unicast address or anycast address.
1675BEUI-64 address-based interface identifiers
An interface identifier is 64 bits and uniquely identifies an interface on a link.
Interfaces generate EUI-64 (64-bit Extended Unique Identifier) address-based interface identifiers
differently.
• On an IEEE 802 interface (such as an Ethernet interface and a VLAN interface)
The interface identifier is derived from the link-layer address (typically a MAC address) of the
interface. The MAC address is 48-bit long. To obtain an EUI-64 address-based interface identifier,
insert the hexadecimal number FFFE (16 bits of 1111111111111110) into the MAC address
(behind the 24th high-order bit), and set the universal/local (U/L) bit (which is the seventh
high-order bit) to 1, ensuring that the obtained interface identifier is globally unique.
2851HFigure 357 shows how an EUI-64 address-based interface identifier is generated from a MAC
address.
Figure 357 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.
821BIPv6 neighbor discovery protocol
The IPv6 Neighbor Discovery (ND) protocol uses the following ICMPv6 messages:
Table 70 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.