tcp ip guide

Principle of TCP/IP reliability Sliding Window congestion window and TCP Window TCP and UDP are on the same layer-transport layer, but the most difference between TCP and UDP is that TCP provides a reliable data transmission servi

Directory: TCP Header Maximum message segment length Semi-closed State transition Diagram Incoming connection request queue 1.TCP Header TCP provides a connection-oriented, reliable byte-stream service. Connection-oriented means that two applications that use TCP (typically a customer and a server) must establish a

Chapter Review:"TCP/IP Detailed Volume 1: Agreement" 1th Chapter Overview-Reading Notes"TCP/IP Detailed Volume 1: Protocol" chapter 2nd link layer-Reading notes"TCP/IP Detailed Volume 1: Protocol" 3rd

and slice The first digit is not used. Every two DF (don't fragment) bits are 1. If the transmitted datagram exceeds the maximum transmission unit, the datagram is discarded, and sends an ICMP error message. The third-digit MF (more fragment) indicates whether more slices exist. The value of this parameter is 1, indicating that more fragments exist in the future. The last mf is 0.After an IP packet is split, each datagram has its own header, but the

) the process of 1.TCP/IP protocol data Encapsulation Take the transport layer adopt TCP or UPD, the network layer uses the IP, the link layer uses the Ethernet as the example, may see the TCP/IP message encapsulation process

Linux Network firewall NetFilter: is a frame of the kernel: framework IPTABLES: Data packet filtering: Nat mangle and other rule generation tools Network knowledge: IP packet header NB Sp TCP headers NBSP;NBSP;NBSP;HDR Len Header First ministerial The bytes given must be multiplied by landscape 32/8 = 4 bytes typeof service (service type) service type total length (total length) Total messa

need retransmission, the following specific explanation time-wait (time wait) status reasons:The TIME_WAIT state is maintained at twice times the maximum section life, 2MSL (msl=30s~120s) Reason one: Reliable termination of TCP full-duplex connections If the client receives a server-side fin, the ACK packets sent are lost in the path , due to the time-out retransmission mechanism, The server side is not receiving an answer from th

The first thing to look at is TCP/IP protocol, which involves four layers: link layer, network layer. Transport layer, application layer.The data frame of the Ethernet (Ethernet) in the link layerIP packets on the network layerTCP or UDP packets in the transport layerdata in TCP or UDP is in the application tierTheir relationship is the data frame {

1. OverviewTCP provides a connection-oriented, reliable byte-stream service. Full-duplex communication. A TCP connection is uniquely determined by a 4-tuple: Local IP address, local port number, remote IP address, and remote port number.TCP packs the user data into a message segment, initiates a timer when it sends the data, confirms the received data on the othe

OGG-01232 Receive TCP Params Error: TCP/IP Error 104 (Connection Reset By Peer)., ogg-01232params The following errors are often seen in OGG log files:OGG-01232 Receive TCP Params Error: TCP/IP Error 104 (Connection Reset By Peer

Finally, we finally came to the large header TCP protocol. In order to provide reliable transmission services for the application layer, various mechanisms are designed for tcp to achieve possible errors during transmission, such as packet loss, retransmission, disordered order, and link transmission errors. 1. TCP Overview First, let's take a look at the header

. First, use the DNS protocol to resolve the URL to an IP address, then establish a TCP connection between the client and the server, and use Wireshark to capture the group, for example: Figure 4 establish a TCP connection group by Wireshark capture You may think it is a bit strange. In theory, it should be three groups. How can we have six groups? First, send a

Baidu homepage as an example. First, use the DNS protocol to resolve the URL to an IP address, then establish a TCP connection between the client and the server, and use Wireshark to capture the group, for example: Figure 4 establish a TCP connection group by Wireshark capture You may think it is a bit strange. In theory, it should be three groups. How can we h

I. TCP segment format: Shows the TCP segment format. Source Port Number and destination port numberThe source port number and destination port number, and the source IP address of the IP header and the destination IP address uniquely determine a

Libnids is a library for network security and can be used to detect attacks on the network. The most valuable part is that it simulates the Layer 3 and Layer 4 protocol stacks in the Linux kernel. We can further study the TCP/IP protocol stack in the Linux kernel for some valuable reference. Here is a brief introduction to the implementation details of the layer 3 and Layer 4 protocols in this library (befo

Plot? Tcp / ip? Sixth chapter? TCP vs. UDP? Note 6.1 The role of the transport layer?The transport layer must indicate this specific program, in order to achieve this function, use the port number of such an identification code. Depending on the port number, it is possible to identify specific programs that are all processed by the application layer on the transp

Finally saw the TCP protocol, which is the most important and the most exciting part of the TCP/IP details, to spend great effort to read. In front of TFTP and BOOTP are some simple agreement, do not write notes, write up nothing. TCP and UDP are in the same layer---transport layer, but

Finally see the TCP protocol, this is the TCP/IP detailed inside the most important is the most exciting part, it will take great effort to read. The previous TFTP and BOOTP are simple protocols, no notes, no writing. TCP and UDP are at the same level---transport layer, but TCP