Implementing Dynamic IPv6 Addresses.ppt

1、Implementing IPv6,Implementing Dynamic IPv6 Addresses,Aggregatable Global Unicast Addresses,Cisco uses the extended universal identifier (EUI)-64 format to do stateless autoconfiguration. This format expands the 48-bit MAC address to 64 bits by inserting “FFFE” into the middle 16 bits. To make sure

2、that the chosen address is from a unique Ethernet MAC address, the universal/local (U/L bit) is set to 1 for global scope (0 for local scope).,Link-Local Address,Link-local addresses have a scope limited to the link and are dynamically created on all IPv6 interfaces by using a specific link-local pr

3、efix FE80:/10 and a 64-bit interface identifier. Link-local addresses are used for automatic address configuration, neighbor discovery, and router discovery. Link-local addresses are also used by many routing protocols. Link-local addresses can serve as a way to connect devices on the same local net

4、work without needing global addresses. When communicating with a link-local address, you must specify the outgoing interface because every interface is connected to FE80:/10.,EUI-64 to IPv6 Interface Identifier,A modified EUI-64 address is formed by inserting “FFFE” and “complementing” a bit identif

5、ying the uniqueness of the MAC address.,EUI-64 to IPv6 Interface Identifier (Cont.),A modified EUI-64 address is formed by inserting “FFFE” and “complementing” a bit identifying the uniqueness of the MAC address.,EUI-64 to IPv6 Interface Identifier (Cont.),A modified EUI-64 address is formed by inse

6、rting “FFFE” and “complementing” a bit identifying the uniqueness of the MAC address.,Multicasting,Examples of Permanent Multicast Addresses,Anycast,An IPv6 anycast address is a global unicast address that is assigned to more than one interface.,Stateless Autoconfiguration,A Standard Stateless Autoc

7、onfiguration,Stage 1: The PC sends a router solicitation to request a prefix for stateless autoconfiguration.,Stage 2: The router replies with a router advertisement.,A Standard Stateless Autoconfiguration (Cont.),IPv6 Mobility,Summary,The MAC address may form a portion of the IPv6 system ID. IPv6 m

8、ulticast addresses are defined by the prefix FF00:/8. Multicast is frequently used in IPv6 and replaces broadcast. IPv6 provides an efficient means to implement mobile IP, which has not been possible with IPv4.,Implementing IPv6,Using IPv6 with IPv4,IPv4-to-IPv6 Transition,Transition richness means:

9、 No fixed day to convert; no need to convert all at once. Different transition mechanisms are available: Smooth integration of IPv4 and IPv6. Use of dual stack or 6to4 tunnels. Different compatibility mechanisms: IPv4 and IPv6 nodes can communicate.,Cisco IOS Software Is IPV6-Ready: Cisco IOS Dual S

10、tack,If both IPv4 and IPv6 are configured on an interface, this interface is dual-stacked.,Dual stack is an integration method where a node has implementation and connectivity to both an IPv4 and IPv6 network.,Dual Stack,Cisco IOS Software Is IPv6-Ready: Overlay Tunnels,Tunneling encapsulates the IP

11、v6 packet in the IPv4 packet.,Tunneling,Tunneling is an integration method where an IPv6 packet is encapsulated within another protocol, such as IPv4. This method of encapsulation is IPv4 protocol 41: This method includes a 20-byte IPv4 header with no options and an IPv6 header and payload. This met

12、hod is considered dual stacking.,“Isolated” Dual-Stack Host,Encapsulation can be done by edge routers between hosts or between a host and a router.,Cisco IOS Software Is IPv6-Ready: Configured Tunnel,Configured tunnels require: Dual-stack endpoints IPv4 and IPv6 addresses configured at each end,Exam

13、ple: Cisco IOS Tunnel Configuration,Cisco IOS Software Is IPv6-Ready: 6to4 Tunneling,6to4 Is an automatic tunnel method Gives a prefix to the attached IPv6 network,NAT-Protocol Translation (NAT-PT) is a translation mechanism that sits between an IPv6 network and an IPv4 network. The job of the trans

14、lator is to translate IPv6 packets into IPv4 packets and vice versa.,TranslationNAT-PT,LAB 1 : 基本的IPv6配置、路由汇总及静态路由,2001:AB1:0:9:1/642001:AB1:0:A:1/642001:AB1:0:B:1/642001:AB1:0:C:1/64,2001:AB1:0:4:1/64,2001:AB1:0:2:1/64S1/1,2001:AB1:0:3:1/64S1/1,S1/02001:AB1:0:2:2/64,S1/02001:AB1:0:3:2/64,ipv6 unica

15、st-routing!interface loopback 0 ipv6 address 2001:AB1:9:0:1/64 ipv6 address 2001:AB1:a:0:1/64 ipv6 address 2001:AB1:b:0:1/64 ipv6 address 2001:AB1:c:0:1/64!interface s1/1 ipv6 address 2001:AB1:0:2:1/64 no shutdown!ipv6 route 2001:AB1:0:4:/64 2001:AB1:0:2:2ipv6 route 2001:AB1:0:3:/64 2001:AB1:0:2:2,i

16、pv6 unicast-routing!ipv6 route 2001:AB1:0:8:/62 2001:AB1:0:3:1,确认2001:AB1:0:C:/64子网是否可以ping通.,R1,R2,R3,IPv6Network,IPv6Network,LAB 2 : IPv6 隧道,192.168.1.2/24S1/0,192.168.2.1/24S1/1,S1/0192.168.2.2/242001:AB1:0:2:2/64,2001:AB1:0:9:1/642001:AB1:0:A:1/642001:AB1:0:B:1/642001:AB1:0:C:1/64,2001:AB1:0:3:1

17、/64,ipv6 unicast-routing!interface tunnel 0 ipv6 address 2001:ab1:0:2:1/64 tunnel source serial 1/1 tunnel destination 192.168.2.2 tunnel mode ipv6ip!ip route 192.168.2.0 255.255.255.0 192.168.1.2ipv6 route :/0 2001:ab1:0:2:2,ipv6 unicast-routing!interface tunnel 0 ipv6 address 2001:ab1:0:2:2/64 tun

18、nel source serial 1/0 tunnel destination 192.168.1.1 tunnel mode ipv6ip!ip route 192.168.1.0 255.255.255.0 192.168.2.1ipv6 route :/0 2001:ab1:0:2:1,R2,IPv4Network,IPv4Network,R3,2001:AB1:0:2:1/64192.168.1.1/24S1/1,IPv6Network,IPv6Network,R1,LAB 3 : IPv6&IPv4 NAT-PT静态映射配置,R2,IPv4Network,IPv6Network,2

19、001:AB1:0:1:2/64S1/0,192.168.1.1/24S1/1,S1/12001:AB1:0:1:1/64,S1/0192.168.1.2/24,R1,R3,192.168.2.10/24,ping,ping,ipv6 unicast-routing!interface s1/1 ipv6 address 2001:ab1:0:1:1/64!ipv6 route :/0 2001:ab1:0:1:2,ipv6 unicast-routing!interface s1/0 ipv6 address 2001:ab1:0:1:2/64 ipv6 nat!interface s1/1 ip add 192.168.1.1 255.255.255.0 ipv6 nat!ipv6 nat v4v6 source 192.168.1.2 2001:DB1:0:1:2ipv6 nat v6v4 so