Design And Implementation Of Enhanced Network Connectivity Detection Protocol

The connectivity protocol as the basic protocol to ensure the stable working of the internet,which makes up the gap of the network layer protocol lack error control means,and provides the network connectivity inquire mechanism for the terminal users,support the packet forwarding and the operation of network service.ICMP as IP supplementary protocol for the network to provide such as host or route unreachable and source quench and other reporting messages.But based on the ICMP connectivity protocol lack the capability of perception for network routing and network status,It`s can not satisfy the requirements of high availability?accuracy of fault location?safety and reliability for the network connectivity detection.Aiming at the above problems,this paper designs an enhanced network connectivity detection protocol based on the research of existing connectivity protocols and network management.It not only can report error and control function,but also inquire the information of network status and has the mechanism of security protection,which provides an important basis for users to detect network performance bottlenecks.Firstly,this paper analyzes the status and development of the connectivity protocol at home and abroad,focus on the communication process of ICMP protocol and summarizes the advantages and disadvantages.Contrapose the original protocol can not be efficient access to the link state information of network equipment and security issues,This paper proposes an enhanced network connectivity protocol,which adds a function of information acquisition.By extended the ICMP message content and interaction mechanism,the TLV coding rules are used to carry the link state informationthe in the ICMP repley messages,such as interface bandwidth and load etc.In the communication,the destination host and the intermediate route receive the request,add the interface information after the ICMP echo packet header to the source host.It realize the target that the acquisition of network link state information.At the same time,the protocol also provides a security checking mechanism.The joint device sends a verification message to the source address for the corresponding ICMP message type and waits for a response.We could deduce that the ICMP message is ture or false by analyzing the response.Finally,the simulation network environment is used to verify the feasibility,which is of the single host information acquisition and the status information is carryed to forward the message in the intermediate router.We analyze the packet by capturing the packet and the application of the message data is extracted.The validity of the enhanced protocol is verified.