IPv4 vs IPv6

  • 本文是阅读《IPv4 vs IPv6 – Why is IPv6 so important?》做的一篇废文。

  • 因为我一点都没学过计网,按自己的理解去翻译的,等我学完再过来review,应该有很多理解错误。

  • 里面有大量我不懂的专业术语,以(???)标记,日后深入研究,希望早日理解这些问题。


Intro

  • IPv6 is the newest version of Internet Protocol (IP)
  • The Internet continues to grow and that growth will only be accommodated by IPv6 addresses.

WHY IS IPV6 SO IMPORTANT?

WHY IS IPV6 SO IMPORTANT

  • Every Internet-connected device has its own unique IP address, which is required for websites to know where to send information.
  • IPv6 allows provision for 340 trillion trillion trillion IP addresses.

Features of IPV6

ipv6-4

  1. Large capacity for IP add. 大容量的ip地址
  2. Simplified header. 简化报头
  3. Direct connectivity between all hosts on the internet.主机直接互连
  4. Automatic configuration of host devices. 主机设备自动配置
  5. Almost instant routing. 即刻路由
  6. Use of multicast to connect with multiple hosts. 多主机间的多广播(??
  7. Anycast support. 任播支持(???
  8. Mobility of hosts to roam different geographical areas while maintaining connection with the same IP address. 漫游移动端维持一样的ip地址
  9. Extensibility of options. 扩展选项

IPV4 VS. IPV6

ipv6-5

IPV4 IPV6
manually,increasing the maintenance requirement. auto-configuration,easier to manage.
只用一个ip掩蔽就可以取消数以千万计的非路由地址,大大影响了端到端的整体性。(???) 因为有大量的地址空间,所以可以直接定向,NAT的需求适用,但是被淘汰了(不确定
一个人不一定拥有一个ip地址 每平方米有1k多个地址,就是说地址空间多
为通信而设计,允许小范围的更新和同步 大量的地址,可以大量的innovation and collaboration
受限的网络拓扑,意味着 受限的移动性和互操作性(交互性 用ipv6的设备,其移动性和交互性被大大增强了
不同应用中的安全性不一样 在IPV6协议中,包含了网路协议安全(IPSEC),是对IPV4的安全性升级

NAT(network address translation)网络掩蔽、IP掩蔽

(科普了也不懂系列。先了解了解,日后深入研究)

  • Remapping one IP address space into another.将IP地址映射另一个IP地址
    • modifying network address information in the IP header of packets while they are in transit across a traffic routing device).在路由设备或者防火墙传输时,重写包的ip头部网络地址
  • used as a shortcut快捷 to avoid the need to readdress every host when a network was moved. 当网络被移走时,避免重地址的捷径
  • It has become a popular and essential tool in conserving global address space in the face of IPv4 address exhaustion. 面对IPV4地址的枯竭,用nat来保存全球地址空间。
  • One Internet-routable IP address of a NAT gateway网关 can be used for an entire private network.

  • wiki 中文:在计算机网络中,NAT是一种在IP数据包通过路由器或防火墙时,重写来源IP地址目的IP地址的技术。这种技术被普遍使用在有多台主机但只通过一个公有IP地址访问因特网的私有网络中。它是一个方便且得到了广泛应用的技术。当然,NAT也让主机之间的通信变得复杂,导致了通信效率的降低。


IPV6 ADDRESSING MODES

ipv6-6

  • 单一传播
  • 多向传播
  • 任意传播
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