大中华区产品经理.pptVIP

Outline IPv6 Overview Transitioning to IPv6 Philosophy and requirements Transition tools Scenarios API transition - porting socket applications Solaris? 8 Configuration and Use New IPv6 Features Enough address space for new Internet devices!!! Plug play (auto configuration, renumbering) IP level security from day one IP multicast from day one Traffic class field for differentiated service Flow label for more efficient handling of reserved QoS Efficient IP mobility support Neighbor Discovery (ARP++) for autoconfig and improved robustness IPv4 Addressing Unicast addresses Global addresses Now uses prefix-based hierarchical allocation (CIDR) Private IP address space (RFC 1918) Multicast addresses Deliver to a group address Any host can join a group address and receive packets Anycast functionality possible using routing system Logical service implemented by multiple servers Anycast uses the routing system to deliver to one server Compare: Multicast would deliver to all servers IPv6 vs. IPv4 Addressing Larger addresses - 128 bits instead of 32 bits Multiple addresses required for hosts (new) Global addresses (hierarchical allocation) Site-local addresses (new - like IPv4 private addr) Isolate the internal traffic from external changes Link-local addresses (new) For booting and routing protocol traffic Multicast Includes scope information in IPv6 Anycast (formalized notion) IPv6 Address Formats Global address 3 bits 13 bits 32 bits 16 bits 64 bits 010 TLA NLA(s) Subnet Interface token Site local address 10 bits 38 bits 16 bits 64 bits 1111111011 000…0 Subnet Interface token Link local address 10 bits 54 bits 64 bits 1111111010 000…0 Interface token Multicast address 8 bits 4 4 112 bits flags scope Group ID Text Representation of Addresses Recall IPv4 uses “dotted decimal” notation Each byte is in decimal e. g. 30 IPv6: colon separated he