tcp ip guide

TCP/IP network programming (transcription note 1) –tcptable of Contents Server Client A better client-side implementation Source: "TCP/IP network Programming"Transcription Both sides of the communication have their own input cache and output cacheThe write function of the socket is not to tr

In the TCP/IP protocol, backlog analysis and settings, and TCP status changes. In the TCP/IP protocol, the first section describes how to set the backlog value. What is this value? We all know that TCP requires three-way handshake

Reference Original address: http://www.cnblogs.com/JuneWang/p/3917697.htmlIP Address:IPv4IP address = network number + host numberSubnet Mask:A subnet mask is a basis for determining whether the IP addresses of any two computers belong to the same subnet . The simplest understanding is that the respective IP addresses of the two computers and the subnet mask after the and operation, the result is the same,

TCP needs to process two types of data at the same time: block data, interactive data.This chapter will take the Rlogin application as an example to observe the transfer process of interactive data.Interactive inputFirst, the flow of data generated by typing an interactive command on a rlogin connection (each typing an interactive key produces a data grouping), which results in 4 segments:1. Interactive keys from the customer;2. Key confirmation from

A Send a connection request and wait for confirmation A, b Established Both establish a connection The four-time handshake close link is as follows:The specific steps are as follows:1.A send fin message, Mark Seq=m2.B after receiving fin message, send confirmation message, Mark Seq=m+1Fin messages are also sent after 3.B, labeled Seq=n4.A after receiving fin message, send confirmation message, Mark Seq=n+1At this point the two sides are disconnected, and

TCP/IP Note 3. Transport Layer (3) -- TCP timeout retransmission algorithm TCP sets a timer for each packet segment sent by TCP. As long as the retransmission time set by the timer is reached but no confirmation has been received, it is necessary to re-transmit this packet s

Transfer http://blog.csdn.net/goodboy1881/article/details/668556 ------------------------------------------------------ Put the three Protocols together for learning because these three protocols are on the same layer. ARP is used to find the MAC address of the Ethernet NIC of the target host, and the IP address carries the message to be sent. The data link layer can get the data transmission information from ARP, and get the data information to be tr

I. Introduction: IP is the most core protocol in the TCP/IP protocol family. All TCP, UDP, ICMP, and IGMP data are transmitted in IP datagram format. Note that the IP address is not a reliable protocol, the

IP: network protocol IP is the most core protocol in the TCP/IP protocol cluster. It provides unreliable and connectionless datagram transmission services.Unreliable means that it cannot guarantee that the IP datagram can successfully reach the destination. The

Put these three protocols together because the three protocols are on the same level, the ARP protocol is used to locate the target host's Ethernet NIC MAC address, and the IP hosts the message to be sent. The data link layer can get the data transfer information from ARP, and the data to be transmitted from IP.1.IP protocolThe

TCP/IP protocol details volume 1 Study Notes series 3-IP Routing Chapter 9 IP routing This chapter describes the basis of the TCP/IP protocol cluster. IP routing ensures that the correc

field is MF (more Fragment) Mf=1 indicates "There are shards" later. Mf=0 represents the Last Shard Df The one in the middle of the Flag field is DF (Don ' t Fragment) Shards are allowed only when df=0 Chip Offset:Occupies 12 bits, which refers to the relative position of a piece in the original group after the Shard. Slice offset in 8-byte offset unitsSurvival time:The maximum number of routers that are recorded as TTL (Time to Live) datagrams in th

the IP multicast group. The network drive must be able to recognize this address. Level 2: The host can send and receive IP Multicast To receive IP multicast, the host must be able to join or leave Multicast Groups, and IGMP must be supported to exchange group member information on at least one interface. Multi-interface host It must support multicast on a subne

a host or a simple routing algorithm for it. essentially the difference is that the host never forwards the datagram from one interface to another, while the router forwards the datagram. The host that contains the router function should never forward datagrams unless it is set to that.In a general system, IP can accept datagrams from tcp,udp,icmp and IGMP (i.e. locally generated datagrams) and send them,

The IP protocol is the most important protocol in the family of TCP/IP protocols, which provides unreliable, non-connected datagram transport services. So understanding IP protocols is critical to our learning network.IP headerImportant Field Introduction：4bit First ministerial degree: in 4 bytes, determines the

TCP/IP stack attacksTwo of the following types: Scanning: scanning or tracking footprints are part of the hacker's initial information collection process. Before hackers can attack a system, they need to collect information about the system, such as network layout, operating system type, available system services, and system users. Hackers can deduce possible vulnerabilities Based on the collected informati

Label: TCP Linux The IP Input Function (ipintr) will process the options after verifying the Group format (check, length, etc.) and before determining whether the group has reached the destination. This indicates that the Group Each vro encountered and the final target host process the option to be grouped. An IP group can contain optional fields that are process

The relationship between OSI layer seven and TCP/IP layer four1.1 OSI introduces the concepts of services, interfaces, protocols, and hierarchies, and TCP/IP builds the TCP/IP model using these concepts from OSI.1.2 OSI first has

Before that, if you do not understand the IP sharding technology, refer to here. The IP sharding technology is simple and violent, and it is not as complicated as the TCP window protocol. Basically, the code is basically in ip_defragment.c. Let's talk about it in general. First, each IP address (host) will have an

和ip结构之间的关系。 图中含有大量的信息： 1.全部结构都放在一个mbuf的数据区内。 2.ipq链表由next和prev连接起来的ipq结构组成。每一个ipq结构保存了唯一标识一个IP数据报的四个字段。 3.当作为分片链表的头訪问时，每一个ipq结构被看成是一个ipasfrag结构。这些分片由ipf_next和ipf_prev链接起来，分别 覆盖了ipq结构的ipq_next和ipq_prev成员。 4.每一个ipasfrag结构都覆盖了到达分片的ip结构，与分片一起到达的数据在缓存中跟在该结构之后。 从逻辑的观点说明重装结构，该图显示了三个数据报的重装，以及ipq链表和ipasfrag结构之间的关系，阴影部分为缺少 的分片。 以下分几个部分说明重装 1.创建重装表 假设没有符合条件的ipq，则用新的数据报的第