Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 561)

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D-9

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Appendix D Addresses, Protocols, and Ports

IPv6 Addresses

Figure D-1 IPv6 Multicast Address Format

IPv6 nodes (hosts and routers) are required to join the following multicast groups:

• The All Nodes multicast addresses:

–

FF01:: (interface-local)

–

FF02:: (link-local)

• The Solicited-Node Address for each IPv6 unicast and anycast address on the node:

FF02:0:0:0:0:1:FFXX:XXXX/104, where XX:XXXX is the low-order 24-bits of the unicast or

anycast address.

Note Solicited-Node addresses are used in Neighbor Solicitation messages.

IPv6 routers are required to join the following multicast groups:

• FF01::2 (interface-local)

• FF02::2 (link-local)

• FF05::2 (site-local)

Multicast address should not be used as source addresses in IPv6 packets.

Note There are no broadcast addresses in IPv6. IPv6 multicast addresses are used instead of broadcast

addresses.

Anycast Address

The IPv6 anycast address is a unicast address that is assigned to more than one interface (typically

belonging to different nodes). A packet that is routed to an anycast address is routed to the nearest

interface having that address, the nearness being determined by the routing protocol in effect.

Anycast addresses are allocated from the unicast address space. An anycast address is simply a unicast

address that has been assigned to more than one interface, and the interfaces must be configured to

recognize the address as an anycast address.

92617

128 bits

4 bits4 bits

0 if permanent

1 if temporary

Interface ID0

1111 1111

8 bits 8 bits

F F Flag Scope

Flag =

Scope =

1 = node

2 = link

4 = admin

5 = site

8 = organization

E = global

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