IPv6现状、研究动态和过渡策略-赛尔网络-v6－李星.pptVIP

中国教育网络历史 IPv6 Header Controversy (1) Do we need more than 255 hops? Large network vs routing loop Is the destination address in the right place? 128bit processor Should packets be larger than 64K? Jumbogram option Can we live without a checksum? Link layer checksum and risk analysis Controversy (2) The length of addresses 64 bits vs. variable length Providers and monopolies keep the network simple Flows and services network map Variable format and renumbering provider/subscriber Controversy (3) Should we mandate security? export restriction/clipper chip Did we choose the correct algorithm? MD5/DES-CBC not secure enough, too slow, or both Is this the right layer? New network code Do we need additional protection? DOS, traffic pattern Controversy (4) Will flow labels be used? There are more flows than sources To reserve or not? Capacity/Adaptive applications What about ATM? As simple as possible, in order to scale Controversy (5) Should we perform translation? Little problems Security risks of tunnels unauthorized tunnels Types of IPv6 Addresses Global Unicast: 2000::/3 Link Local Unicast: FE80::/1 Loopback: ::1/128 6to4: 2002::/16 Teredo: 2001:0000::/32 Unique Local Unicast: FC00::/7 Multicast: FF00::/8 IPv4-Mapped: ::ffff:3 Deprecated: Site Local addrs and IPv4-Compatible addrs. For more on IPv6 addresses, see RFC4291 (+ other RFCs). For the most part, we primarily care about global unicast, link local unicast, and loopback addresses IPv4和IPv6互联网 IPv6地址分布 IPv6路由表增长 Be unique, be different Protocol selection Pure IPv6 Equipment Multiple vendors Complexity Multiple ASs Transition IPv4 over IPv6 (IETF softwire) IVI stateless translation (IETF behave) Architecture Source address authentication (IETF SAVI) Traffic comparison IPv6 Applications Sichuan Earthquake 2009 Solar Eclipse v4v6 IVI (1) 物联网（Internet of Things） 云计算 (Cloud Computing) 三网融合 (Triple-Play) 技术创新工作重点 精细服务 IPv6上网 云计算 用户知情 211-3期的创新点 用户的带宽控制和业务控制系统规划和设计 与全业务支撑系统的集成 IPv6 利用IPv6的契机为CERNET会员单位