what is syn ack

Three-time handshake (three times handshake;three-way handshake) so-called "three-time handshake" that is, the amount of data sent each time is how to track the data segment sent and received synchronization, based on the amount of data received and

This article links through two diagrams to comb the TCP-IP knowledge of the protocol. The TCP communication process consists of three steps: establishing a TCP connection channel, transmitting data, disconnecting the TCP connection channel. As shown

#.3-time handshake process statusFirst handshake: When a connection is established, the client sends a SYN packet (SYN=J) to the server and enters the Syn_send state, waiting for the server to confirm;Second handshake: The server receives the SYN

1. basic operations of the chain 1. clear all rules. 1) clear all rules in the rule chain in the filter of the preset table. # Iptables-F2) clears the rules in the user-defined chain in the preset table filter. # Iptables-X # iptables-Z2, set the

TCP status change Active closure and Passive closure can be used to disable a socket. The former refers to the active shutdown initiated by the local host, while the latter refers to the response made by the local host after detecting that the

This paper combs the knowledge of Tcp-ip protocol through graphs. The TCP communication process consists of three steps: establishing a TCP connection channel, transmitting data, and disconnecting the TCP connection channel. As shown in 1, the TCP

When writing a TCP program, for the service side, accept successfully return, it must mean that a client has successfully established a TCP connection? For clients, does the successful return of connect necessarily mean that they have successfully

In TCP/IP, TCP provides reliable connection services and uses three handshakes to establish a connection, as shown in figure 1.(1) first handshake: when a connection is established, client a sends the SYN Packet (SYN = J) to server B and enters the

"When transmitting data, we can only use the (Transport Layer) TCP/IP protocol. However, without the application layer, we cannot identify the data content, to make the transmitted data meaningful, you must use the application layer protocol. There

The network is divided from bottom to topThe physical layer, the data link layer, the network layer, the Transport layer, the session layer, the presentation layer, and the application layer.With a preliminary understanding, I know that the IP

I believe many of the novice mobile phone networking development friends want to know what is the difference between the HTTP and socket connection, hope that through their own shallow understanding can help beginners.1. TCP connectionMobile phone

Android HTTP communication--1. Initial knowledge of HTTP protocol Android HTTP Communication 1 Initial knowledge of HTTP protocol Introduction Body What the hell is http? Noun analysis

Source: TaubonrenLinks: http://blog.jobbole.com/99694/Since it is a network transmission, involving the interaction between several systems, the first thing to consider is how to accurately locate one or several hosts on the network, and how to

The network is divided from bottom to topThe physical layer, the data link layer, the network layer, the Transport layer, the session layer, the presentation layer, and the application layer.　　With a preliminary understanding, I know that the IP

Physical Layer--Data Link layer--Network Layer--IP protocolTransport Layer--TCP protocolSession Layer--Presentation layer and Application Layer-HTTP protocolThe socket is the encapsulation and application of the TCP/IP protocol (at the programmer

The network seven layer is from the bottom up to the physical layer, the data link layer, the network layer, the transport layer, the conversation layer, the presentation layer and the application layer respectively.The physical layer, the data link

In this article we first understand the basic knowledge, so that we can learn more useful behind.Socket,websocket,http,tcp and so on we have heard the ear has a cocoon, but the use of time to review it.University Learning Network Foundation when the

A brief analysis of TCP/IP protocolTCP/IP is a protocol group that can be divided into three levels: the network layer, the transport layer, and the application layer:Network layer: IP protocol, ICMP protocol, ARP protocol, RARP protocol, and BOOTP

The network is divided from bottom to top: The physical layer, the data link layer, the network layer, the Transport layer, the session layer, the presentation layer, and the application layer. For example, the IP protocol corresponds

  Tcp_syn_retries : INTEGER The default value is 5. For a new connection, the kernel determines how many SYN connection requests are sent before giving up. It should not be greater than 255. The default value is 5, corresponding to the left-right