IP V6 brief IP V6 brief ----- Jahweh CCIE lecturer Zhou (Please specify the source of Jahweh technology http://www.ccxx.net reproduced) 1. Outlined Ipv6 complex to meet the growing needs of the system of coding, ipv4 ipv6 addendum to the address change is the site of frequent occurrence from the Cisco IOS 12.2 (T) ipv6 support. 2. Ipv6 advantages 1. Provide greater address space, and flexibility can be achieved 69.8% and the re-play site 2. More simple header information, enabling routers to provide a more efficient routing transponders. 3. Ip ip secs and maintain compatibility with mobile and mobile safety 4. Ipv4 to provide rich from the ipv6 conversion and interoperability, Ipsec in ipv6 is mandatory. Addressing three ipv6 1. Address Space Address length of 128 bits or 16bytes The addresses can be allocated as follows : 38 th power 3.4x10 Each will have the address of the earth semen volume for the 28 th power : 2.ipv6 address format 32 16 nary per section 4, 8, of the above and between ':' separation In each of the protrusion can write 0 In the same address, the number of consecutive zero can be abbreviated as' : : ' Ipv6 addresses examples : 2031:0000:130f:0000:0000:09c0:876a:130b correct 2031:0:130f:0:0:09c0:876a:130b correct 2031:0000:130f 09c0:876a:130b correct : : 09c0:876a:130b wrong 130f : : : 2031 : 0:0:0:0:0:0:0:1= : 1 correct : 0:0:0:0:0:0:0:0= correct : : Four of multicast ipv6 1.ipv6 not use broadcast communications, the use of multicast or broadcast alternative anycast 2.multicst more efficient communications network, a very big multicast address space ipv6 3.anycast Description : Unicast addresses shared with a number of router (a router multicast transponders) The source of all multicast packets are sent to the address of the Unicast Multicast routers automatically transmitted to the recent arrival Router 5 ipv6 addresses polymerization Summary address prefix to a number of addresses for Prefix Routing addresses polymerization to increase the efficiency and capacity for expansion Address Auto-configuration function of the six ipv6 Addresses for the address to use data-link Auto-configuration for conflicts to the address 69.8% and play (hosts and routers will automatically between the notice and request for the address prefix) The update addresses seven ipv6 A circular path through the revision of the old prefix for the survival time (to reduce their survival time), a new circular prefix. If the prefix change the whole network may need to change the dns 8 ipv6 frame format 1. The first simplified information more efficiently 64bit field in the first, a few less field To hardware-based, efficient processing Routing improve the efficiency, performance and forwarding rate Comparative information and ipv6 first 2.ipv4 Mrs. Fields 12 ipv4 general use, use 8 20bytes;ipv6 Mrs. Fields, 40bytes, including five with ipv4 same field, three new fields. Ipv6 not implement patch operations (fragmentation), the fragmentation of information not ipv4, ipv6 found that the use of a process to determine the most appropriate and adjust a conversation MTU. Ipv6 found the sender's return address network functions will be based on the automatic adjustment of the icmp news MTU sizes. Ipv6 information without first checking in the first field, and the data link layer on top and to ensure the reliability of data transmissions. 3.ipv6 head format Field 4bits version : Traffic class field : scan, similar to the TOS ipv4 Flow label field : 20bits and 20bits of the new field, and because of the rapid exchange and the exchange of multi-storey Field : 16bits payload length, similar to the TOTAL LENGTH field ipv4 Next header field : scan, similar to the ipv4 PROTOCOL field, the top types of information for identifying ipv6. Field : scan hop limit, similar to the TTL field ipv4. Field : 128 bits source address Destination address:128bits 4.ipv6 expansion header information Ipv6 first expansion there can be many types of information, and can use a variety of information-extended applications in the following order : 1) ipv6 header 2) hop-by-hop options header 3) destination options header 4) routing header 5) fragment header 6) authentication header 7) encapsulating security payload header 8) destination options header 9) upper-layer header Interoperability and the ability ipv4 nine ipv6 1. Outlined From the rich ipv4 to ipv6 conversion tool 6to4 tunnel or to the use of dual stack for Smooth Transition NAT can make use of communications nodes ipv4 and ipv6 2.IOS dual stack : If stacked in a dual configuration ipv4 and ipv6 simultaneously adapter, the adapter called dual stacked. Cisco router to use Unicast routing opening ipv6 ipv6 overall order : Adapter order distribution ipv6 addresses use ipv6 address : "ipv6-address[/prefix length]>; 3.overlay tunnel (tunnel-type coverage) Ipv4 the backbone network through a network connecting the two ipv6 Ipv4 put ipv6 data packets encapsulated in the packet data transmission methods Need to use both ends of the tunnel dual-stack Adapter Both ends of the tunnel need to address the allocation of ipv4 and ipv6 4. 6to4 tunnel connecting networks use ipv6 Ipv4 use ipv6 data packets and transmission networks An automatic method is the establishment of the tunnel The ends of the tunnel need to use fixed ipv6 prefix (2002+2 bytes of the local border router ipv4 address) Be transmitted by the edge router addresses ipv6 data packets containing the objective purpose of the edge router addresses ipv4 The purpose of the border router automatically removed ipv4 address ipv4 packets encapsulated in the packet will be transmitted ipv6 Objective border road will be opened for the ipv4 received data packets, and transmitted to ipv6 purpose mainframe. 10, IOS IPv6 routing protocol and demand Integrated isis for Ipv6 12.0 (22) s and 12.2 (8) T BGP for ipv6 12.0 (22) s and 12.2 (2) T RIP for ipv6 12.0 (22) s and 12.2 (2) T Static route for ipv6 12.0 (22) s and 12.2 (2) T Currently, the mutual ipv4 and ipv6 routing protocol is not supported by the re-releases. E-Mail : zj@ccxx.net (Please specify the source of Jahweh technology http://www.ccxx.net reproduced) [ Closed window ]