Инструкции По Установке для 3com S7906E

 

1-5 

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The link-local addresses are used for communication between link-local nodes in neighbor 

discovery and stateless autoconfiguration. Packets with link-local source or destination addresses 

are not forwarded to other links. 

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IPv6 unicast site-local addresses are similar to private IPv4 addresses. Packets with site-local 

source or destination addresses are not forwarded out of the local site (a private network). 

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Loopback address: The unicast address 0:0:0:0:0:0:0:1 (represented in the shortest format as ::1) 

is called the loopback address and may never be assigned to any physical interface. Like the 

loopback address in IPv4, it may be used by a node to send an IPv6 packet to itself. 

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Unassigned address: The unicast address "::” is called the unassigned address and may not be 

assigned to any node. Before acquiring a valid IPv6 address, a node may fill this address in the 

source address field of an IPv6 packet. It cannot be used as a destination IPv6 address. 

IPv6 multicast addresses listed in 

 are reserved for special purpose. 

Table 1-2 Reserved IPv6 multicast addresses 

FF01::1 

Node-local scope all nodes multicast address 

FF02::1 

Link-local scope all nodes multicast address 

FF01::2 

Node-local scope all routers multicast address 

FF02::2 

Link-local scope all routers multicast address 

FF05::2 

Site-local scope all routers multicast address 

 

Besides, there is another type of multicast address: solicited-node address. A solicited-node multicast 

address is used to acquire the link-layer address of a neighbor node on the same link, and is also used 

for duplicate address detection (DAD). Each IPv6 unicast or anycast address has a corresponding 

solicited-node address. The format of a solicited-node multicast address is as follows: 

FF02:0:0:0:0:1:FFXX:XXXX 

Where, FF02:0:0:0:0:1:FF is permanent and consists of 104 bits, and XX:XXXX is the last 24 bits of an 

IPv6 unicast or anycast address. 

An interface identifier is used to identify a unique interface on a link and is 64 bits long. 

Different interfaces generate IEEE EUI-64 format interface identifiers in different ways, which are 

described below:  

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IEEE 802 interfaces (such Ethernet interface and VLAN interface): The interface identifier is 

derived from the link-layer address (MAC) of the interface. A MAC address is 48 bits long and 

therefore, to get the interface identifier, the hexadecimal number FFFE needs to be inserted in the 

middle of the MAC address (behind the 24 high-order bits). To ensure the interface identifier 

obtained from a MAC address is unique, it is necessary to set the universal/local (U/L) bit (the 

seventh high-order bit) to “1”. Thus, an interface identifier in IEEE EUI-64 format is obtained.