IPv6 技术理论和实务研习班.ppt

Content Introduction IPv6 Addressing IPv6 Header ICMPv6 Neighbor Discovery Address Autoconfiguration Addressing Allocation Policy Global IPv6 actions Content Introduction IPv6 Addressing IPv6 Header ICMPv6 Neighbor Discovery Address Autoconfiguration Addressing Allocation Policy Global IPv6 actions IPv4定址 IPv4以32bit來做定址空間 共四十億個IPv4位址可用 IPv4位址表示方式為xxx.xxx.xxx.xxx例如 IPv4定址架構(classfull)如下 001 - 126 = Class A 128 - 191 = Class B 192 - 223 = Class C 224 - 239 = Class D 240 - 254 = Class E Problems with IPv4(1/2) Address depletion/ exhaustion and its implications NAT (Network Address Translation) CIDR Problems with IPv4(1/2) Scaling problems with Inter- domain routing CIDR (Classless Inter-Domain Routing) Manual configuration required DHCP (Dynamic Host Configuration Protocol) Multicast, Security, Quality of Service and Mobility IP multicast, IPSec, DiffServ and IP mobility Header and format limitations that limit future flexibility NAT Network Address Translation allows a site to use private addresses behind a NAT gateway/ firewall when communicating locally, and then automatically get a global IPv4 address assigned from a smaller pool when needed for Internet communication, which requires changing the IPv4 header’s source address on the fly, which has a few problems... Potential IPv6 Services Broadband Access Subscribers 95% FTTH coverage by 2008 6 millions by 2008 3G and WLAN Services 3G services to be launched in 4Q 2003 Public Hotspots deployment plan to make Taiwan a “Wireless Island Home network and IA Services e-Taiwan Projects will catalyze the development of home IA Content Introduction IPv6 Addressing IPv6 Header ICMPv6 Neighbor Discovery Address Autoconfiguration Addressing Allocation Policy Global IPv6 actions Address Notation 以16進位，每16位元為單位並以‘：’為區隔來表示 3FFE:3600:4368:1234:0008:AB12:98CE:1000 IPv4以十進位，每8位元為單位並以‘?’為區隔來表示，如41 為使標示簡潔，位於一單位內前方之0可省略 3FFE:3600:4368:1234:8:AB12:98CE:1000 為使標示簡潔，若有連續為0 之位元，可以“::”表示，但一個位址中只能使用一次 3FFE:3600::1 與 3FFE:3