Application of Ipv6 in University Campus Network

This paper expounds the basic concept, implementation technology and current technology of ipv6, systematically describes the configuration of ipv6 on network export devices Cisco6503 and Cisco65 13, and the practical application of ipv6 in our school campus network. ?

Keywords ipv6；; Tunnel technology; Double protocol stack technology

1 Introduction

The existing Internet operates based on the IPv4 protocol. IPv6 is the next version of Internet protocol. It was originally proposed because with the rapid development of the Internet, the limited address space defined by IPv4 will be exhausted, and the shortage of address space will definitely affect the further development of the Internet. In order to expand the address space, it is suggested to redefine the address space through IPv6. IPv4 uses 32-bit address length, with only about 4.3 billion addresses, which is estimated to be allocated in 2005 ~ 20 10, while IPv6 uses 128-bit address length, which can provide almost unlimited addresses. According to the conservative method, the actual assignable addresses of IPv6 can be estimated, and the assignable addresses per square meter of the whole earth exceed 1000. In the design process of IPv6, besides solving the problem of address shortage once and for all, other problems that IPv4 can't solve well are also considered. The main advantages of IPv6 are: expanding the address space, improving the overall throughput of the network, improving the quality of service (QoS), ensuring better security, supporting plug and play and mobility, and better realizing the multicast function.

Overview of 2 2 IPv6 implementation technology

From ipv4 to ipv6? This transformation must enable ipv6 to support and deal with the legacy problems of ipv4 system. At present, IETF (? Internet? Engineering? Mission? Force) has set up a special working group to study ipv4? To ipv6? And many schemes have been proposed, mainly including the following types:

2. 1 dual protocol stack technology

When developing a dual-stack network, the host runs two protocols at the same time, which makes the applications turn to ipv6 one by one. For transmission. Mainly used with ipv4? And ipv6 devices can communicate with each other. Dual stack will be in Cisco? Used on the Ios software platform, it supports applications, Telnet, Snmp and other protocols on ipv6 transmission.

2.2 Tunnel technology

With the development of ipv6 network, there are many local ipv6 networks. Network, but these ipv6 networks need to pass ipv4? Backbone network connection. These isolated "ipv6? The interconnection of islands must use tunnel technology. Tunneling technology can be used to run ipv4 through existing? Internet protocol? Backbone network (? That is, the tunnel) connects to the local ipv6 network, so it is from ipv4 to ipv6? The easiest technology to adopt in the early stage of transition.

Does the router know ipv6? Packets of are encapsulated into ipv4, ipv4? The source address and destination address of the packet are the ipv4 addresses of the tunnel entrance and exit respectively. At the exit of the tunnel, ipv6 packets are taken out and forwarded to the destination site. Tunnel technology only needs to modify the entrance and exit of the tunnel, and has no requirements for other parts, so it is very easy to realize. But tunnel technology can't realize ipv4? Host and ipv6? Direct communication of the host.

2.3? Network address translation/? Protocol conversion technology

Network address translation/? Protocol conversion technology NAT-PT (network? Address? Translation agreement? With s ||| t? Protocol conversion and traditional ipv4? Dynamic address translation NAT under? And an appropriate application layer gateway (ALG), only ipv6 is installed. Communication between the host and most applications with only ipv4 machines installed. The above technologies largely depend on the transition of Internet from supporting ipv4 to supporting ipv6. Internet conversion, we expect ipv4? And ipv6? Can be compatible with each other in this conversion process. Currently 6tot4? Mechanism is one of the more popular means of realization.

3 ipv6 solution of campus network in our school

Our school has two campuses: the old campus and the new campus. The two campuses are connected with the old campus through Cisco65 13 of the new campus, and Cisco65 13 is connected with the border exit Cisco6509.

The network topology diagram is as follows (figure 1):

Aiming at the communication between IPv4 and IPv6, and in the process of network evolution from IPv4 to IPv6, how to realize seamless connection between IPv6 network and existing IPv4 network is adopted by our school on the education network.

Tunnel technology, double stack technology and address header translation technology have realized mutual access to ipv6 network, that is, with the help of mature ipv4 technology, ipv6 data packets are encapsulated and unpacked in ipv4 format. ?

The actual ipv6 configuration of our school is as follows:

The ipv6 configuration of the core device 6573 is as follows:

Interface? Gigabit Ethernet 12/47

Description? cumt？ ipv6？ ring

ipv6？ Address? 200 1:DA8: 100d: 1::2/64//？ Ipv6 address configuration of 65 13 and 6503 three-layer docking

Interface? Vlan 12

No? ip？ Resend

ipv6？ Address? 200 1:DA8: 100d:2:: 1/64//？ Vlan configuration of ipv6.

ipv6？ Enable//start ipv6 protocol on Cisco65 13.

ipv6？ Route? ::/0? 200 1:DA8: 100d: 1:: 1//？ Ipv6 default routing configuration

The ipv6 configuration on the export device Cisco6503 is as follows:

Interface? Gigabit Ethernet 3/47

ipv6？ Address? 200 1:DA8: 100d: 1:: 1/64？ //? Ipv6 address configuration of three-layer docking between 6503 and 65 13.

ipv6？ Route? 200 1:DA8: 100D::/48？ 200 1:DA8: 100d: 1::2

ipv6？ Route? ::/0? 200 1:DA8:A3:F00B:: 1？

ipv6？ Unicast routing? //ipv6 routing configuration

Interface? Tunnel0？ //ipv6 tunnel configuration

ipv6？ Address? 200 1:DA8:A3:F00B::2/64？ //ipv6 address of the source side

ipv6？ Enable//start the ipv6 protocol.

Tunnel? Source? 202. 1 19.200. 129? //ipv4 address of the tunnel source.

Tunnel? Destination? 202. 1 12.53.38? //ipv4 address of the tunnel target.

Tunnel? mode？ IPv6ip// tunnel mode is IPv6.

The configuration of educational network firewall is as follows:

Access list? 102? Extension? Permission ip？ Really? Moderator? 202. 1 19.200. 129? //Allow campus and off-campus access through ipv6 tunnel.

At present, ipv6 has been well applied in our school, and users in our school can easily access external ipv6 network resources. Our school has also established ipv6 www server and ipv6 DNS resolution to provide external users with access to our ipv6 network resources.

(Figure 1)

4 conclusion

The good application of ipv6 in our school further embodies the powerful charm of ipv6. Although it can't completely replace ipv4 at present, it will certainly replace ipv4 in the near future, thus realizing the operation of a full range of pure ipv6 networks.

refer to

[ 1]? Tunnel technology to realize the transition from ipv4 to ipv6. Computer engineering and its application. 2002? No. 18

[2]? Overview of transition technology from ipv4 to ipv6. Journal of Beijing University of Posts and Telecommunications. In 2002? Question 4

[3] How to transition from ipv4 to ipv6? The computer age. In 2004? Question 8

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