header length

# Include # define source_port 7234 # define max_receivebyte 255 typedef struct ip_hdr // define the IP header {unsigned char h_verlen; // four-bit header length, 4-bit IP version unsigned char TOS; // 8-bit service type TOS unsigned short total_len;

In the computer field, the nature of data is nothing more than 0 and 1, the creation of 0 and 1 is great, but the real blossom is based on 0 and 1 of the various levels between the combination (data structure) brings us various possibilities of

Haha, it's a very old technology, but I wrote one in the past two days, and everyone laughed. Sniff is implemented in three steps: 1. Set the NIC to the hybrid mode 2. Capture IP data packets 3. Analyze IP data packets The following is the

AbstractThere are some old ones, which seem useless now, but they are all famous. 1 Land Attack A Win95 machine. This is a vulnerability in Win95.If you initiate a connection (SYN) on the same port, Win95 will crash. /* Land. c by m3lt, FLCCrashes a

[Keywords] TCP/IP packet structure explanation network protocol In general, we only need to call some encapsulated functions or components for network programming to complete most of the work. However, in some special cases, we need to have a deep

In-depth understanding of TCP protocol TCP is a connection-oriented transmission layer-by-layer protocol that can provide reliable data transmission services for the application layer. The so-called connection orientation is not really a connection,

CocoaAsyncSocket + Protobuf handles packet sticking and packet splitting issues, cocoaasyncsocket sticks to packets In the previous article "ProtocolBuffer setup and demo for iOS", we shared the establishment of the environment. We used the famous

Reprinted please indicate the source: http://blog.csdn.net/ns_code/article/details/29382883 TCP Header Format First look at the format of the TCP packet segment, as shown below; The first 20 bytes of the TCP segment header are fixed, and the next 4

Yesterday I was prepared to write an kbmmw for webserver. However, during the debugging process, I found that the image file cannot be normally displayed. Tracking for a long time The problem is caused by the conversion of string and ansistring in

# Include # Include # Include # Include "mstcpip. H" # Pragma comment (Lib, "ws2_32.lib ") # Define status_failed 0 xFFFF // defines the error code# Define max_pack_len 65535 // maximum IP Message received# Define max_addr_len 16 // the maximum

Finally, I wrote it out. To tell the truth, it took the longest time. I encountered many problems and read many programs ,, now it seems that the 10004 error is generated because the content in the IP header is incorrect. The IP header is basically

(Link) 　　VII. A summary First, make a summary of the previous content. We already know that network communication is the exchange of data packets. Computer A sends a packet to computer B. The latter receives the packet and replies to the packet to

When we use the ping command, we usually ignore its parameters, but it is only used to detect network connectivity. However, the ping parameter has a powerful function, which allows us to infer the network topology from the local machine to the

Preface: The port of the flashsky modified by phantom Mix used to reuse the sniffing serv-u. After testing, it cannot be used on the win2003 server. I don't know the specifics, but I don't know whether the operations are correct, I have never

During this period, I read volume 1 in "TCP/IP details". The biggest feature of this book is that it uses the tcpdump program to capture various network packages, this gives us a definite understanding of the protocols and Algorithms in each layer

Analysis of TCP/IP layer-4 protocol system and tcpip layer-4 Protocol TCP/IP layer-4 protocol system 1) The link layer, also known as the data link layer or network interface layer, usually includes the device driver in the operating system and the

TCP/IP FAQ (1)[Data Link] 1. Must the loopback interface address be 127.0.0.1? Class A IPs such as 127. x can be used as the address of the loopback interface, but 127.0.0.1 is commonly used. 2. Why is there no input for the loop interface? The

The following describes the implementation of the Network 7 layer protocol in Windows:7-Layer Protocol win system________________________________________7 Application Tier 7 applications________________________________________________6 Presentation

This article mainly introduces the Python socket network programming sticky packet problem, and now share to everyone, but also to make a reference. Come and see it together. One, sticky bag problem details 1, only TCP has sticky packet phenomenon,

(1) IPv4 HeaderThe first field of the version IP packet header is the 4-bit version field. For IPv4, the value of this field is 4.The second field of the header length (IHL) is the four-character header length, indicating the length of the