西安电子科技大学：《移动互联网技术》课程教学资源（PPT课件）06 移动互联网IPv6

移动互联网-PV6 苏锐丹

移动互联网-IPv6 苏锐丹

一些形式的地址 2001:0db8:1234:5678:9abc:def0:1234:5678 2001:0db8:0000:130F:0000:0000:087C:140B 2001:0db8:0:130F:87C:140B 2001:db8:12:/64

一些形式的地址

IPv6地址 ■Network ID ▣64位，全球地址管理IANA ■Host ID configured manually or auto-configured Figure 2-1 IPv6 Unicast Network and Host ID Format Network ID Host ID XXXX:XXXX:XXXX:XXXX:YYYY:YYYY:YYYY:YYYY 64 Bits 64 Bits

IPv6地址 ◼ Network ID 64位，全球地址管理IANA ◼ Host ID configured manually or auto-configured

■地址自动配置 Using a randomly generated number ▣Using DHCPV6 Using the Extended Unique ldentifier (EUl-64) format 009027 17 FC OF 00 90 27 OF FF FE

◼ 地址自动配置 Using a randomly generated number Using DHCPv6 Using the Extended Unique Identifier (EUI-64) format

·Unicast address Identifies a single node or interface.Traffic destined for a unicast address is forwarded to a single interface. ·Multicast address Identifies a group of nodes or interfaces.Traffic destined for a multicast address is forwarded to all the nodes in the group. ·Anycast address Identifies a group of nodes or interfaces.Traffic destined to an anycast address is forwarded to the nearest node in the group.An anycast address is essentially a unicast address assigned to multiple devices with a host ID =0000:0000:0000:0000.(Anycast addresses are not widely used today.) With IPv6,broadcast addresses are no longer used

◼ With IPv6, broadcast addresses are no longer used

Address Scope Figure 2-3 IPv6 Address Scopes Global Unique Local Link Local

Address Scope

Global Unicast Addresses Routable and reachable across the Internet Identified by their three high-level bits set to001(2000:/3) Network ID ISP Site LAN Host 3 29 Bits 16Bits、16Bits 64 Bits Global Prefix SLA LAN Interface ID 001 1/32 /48 /64

Global Unicast Addresses ◼ Routable and reachable across the Internet ◼ Identified by their three high-level bits set to 001 (2000::/3)

Global routing prefix ▣service provider ■ Site level aggregator Customer of service provider ■LAN ID Individual networks in customer site

◼ Global routing prefix service provider ◼ Site level aggregator Customer of service provider ◼ LAN ID Individual networks in customer site

Unique Local Unicast Addresses Analogous to private IPv4 addresses Used for local communications,inter-site VPNs,and so forth Not routable on the Internet(routing would require IPv6 NAT) Figure 2-5 Unique Local Unicast Address Format -128 Bits- 1 Global ID 40 Bits Interface ID 1111110 Subnet ID ED00:/7 16 Bits 7 Bits 1 Bit:L=1 Locally assigned;L=0 Future Use

Unique Local Unicast Addresses ◼ Analogous to private IPv4 addresses ◼ Used for local communications, inter-site VPNs, and so forth ◼ Not routable on the Internet (routing would require IPv6 NAT)

Subnet IDs using a hierarchical addressing plan to allow for route summarization

◼ Subnet IDs using a hierarchical addressing plan to allow for route summarization