A method and device for closing a transmission control protocol tcp connection

Abstract

The embodiment of the invention provides a method and device for closing a transmission control protocol TCP connection applied to a server. The method comprises the following steps: transmitting target data packets corresponding to a target data request packet to a client according to the target data request packet transmitted by the client, wherein the target data packets are data packets including a PSH flag; receiving an ACK packet sent by the client after receiving the last target data packet; transmitting at least one RST packet to the client according to the received ACK packet; and closing a server TCP connection that is currently connected to the client. With the embodiment of the invention, the occupation of network resources is reduced.

Description

technical field [0001] The invention relates to the technical field of the Internet, in particular to a method and a device for closing a transmission control protocol (TCP) connection. Background technique [0002] Download services on today's network almost all use the TCP (Transmission Control Protocol, Transmission Control Protocol) protocol from the perspective of the transport layer. For the TCP protocol, when a TCP connection is closed, the closing process of a normal and complete TCP connection is: the server sends a FIN / ACK (Finish / Acknowledgment, completion / confirmation) characters) packet; the client will immediately reply with an ACK packet after receiving this packet, indicating that it has received the information sent by the server; when the client has processed the received data and confirmed that it has no data to send to the server, it will send the The server sends a FIN / ACK packet; after receiving the FIN / ACK packet sent by the client, the server replies...

AI Technical Summary

Problems solved by technology

[0003] However, in practical applications, for the vast majority of cases where the server side actively closes the connection, there are the following problems: even if the connection is closed normally, the server enters TIME-WAIT (time-wait) after sending all the packets that close the connection. ) state, resources will still be occupied, and these resources will be released after waiting for a period of time (2MSL); in most cases, when the server receives the ACK packet sent by the client, it enters FIN-WAIT-2 (end-wait -2) After the state, after a long time, no FIN / ACK packet from the client is received, which leads to a longer waiting time on the server side, thus occupying resources

It can be seen that in the above two cases, the existing TCP connection closing method will cause the server to wait for a long time, thereby increasing the occupation of network resources required for the server to maintain the state of the TCP connection

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