Method for detecting maximal transmission unit of path

Abstract

The invention relates to a method for detecting the maximum transmission unit of path, which is characterized in that: each middle node of node chain from the force source node to the target node, should process the data report of maximum transmission unit of the detecting path sent from the source node to the target node; when the middle node receives the data report, to display the maximum transmission unit information in said data report; and when the target node receives the data report, sending the maximum transmission unit information to the source node; and the source node, based on received information, confirms the path maximum transmission unit of the chain from it to the target node. The invention can quickly and accurately confirm PMTU, to confirm the best throughout of network, and avoid loss and retransmission, to improve the network safety.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for detecting the maximum transmission unit of a path. Background technique [0002] With the rapid development of the Internet, the lack of addresses in IPv4 (Internet Protocol Version 4, Internet Protocol Version 4) has become increasingly serious, so IPv6 (Internet Protocol Version 6, Internet Protocol Version 6) has attracted more and more attention, and has become a new hotness. [0003] IPv6 is the second-generation standard protocol of the network layer protocol, also known as IPng (IP Next Generation, IP Next Generation). It is a set of specifications designed by the IETF (Internet Engineering Task Force) and is an upgraded version of IPv4. The length of the IP address in IPv6 is increased from 32 bits to 128 bits, effectively solving the problem of lack of IPv4 addresses. [0004] In addition to providing a huge address space, IPv6 has also been ...

AI Technical Summary

Problems solved by technology

[0019] Problem 1. When the length of the data packet is greater than the MTU value of the outgoing interface link of the router, the router will discard the actual data packet, thus affecting the quality of real-time voice, video and other multimedia streams

Since these multimedia streams involve real-time decoding, there are strict restrictions on the arrival time of packets, and packet loss and retransmission may have a certain impact on the final media stream effect

[0020] Question 2. Security Issues

When a network device needs to generate and send a message by itself, it consumes a lot of processor resources of the network device

Malicious users send a large number of packets larger than the MTU of the network device. Moreover, when they find that the network device responds with a large packet and requests to reduce the packet size and resend the message, the malicious user can take the option of not reducing the packet size and sending it repeatedly. Large packets, combined with other spoofing means to attack the network equipment, so that the network equipment has to process a large number of such ICMP response packets, thus consuming a large amount of network equipment resources and affecting the normal forwarding work of the network equipment

[0021] Question 3: When the MTU value of each router or some routers between the source PC and the destination PC is decreasing, the current PMTU discovery mechanism requires the source node to repeatedly send data packets to obtain the correct PMTU value, so that the PMTU Low probing efficiency of the discovery mechanism

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