packet catcher

C # solve the TCP "stick packet" problem,I. Principles of TCP stick packets 1. TCP stick refers to the packet data sent by the sender to be pasted into a packet upon receiving by the receiver. From the receiving buffer, the header of the next packet is followed by the end of the previous

LIBIPQ (3)NAMELibipq--iptables user space Packet Queuing librarySynopsis#include #include DESCRIPTIONLIBIPQ is a iptables user space packet queuing development library.User space Packet QueuingNetFilter provides a mechanism for sending packets to the external user space of the stack and then sending the packets back to the kernel with a decision on how to handle

Actually, For tcpdump, you can even say that this experience is actually a customer experience, because he can not only analyze the packet flow direction, but also "listen" to the content of the packet. If the information you use is clear, on the router, it may have been heard by others! Terrible success! So, let's get to know this experience! (Authorization: This tcpdump must use the root identity to uploa

Install Cisco Packet Tracer in Linux What is Cisco Packet tracer? Cisco Packet Tracer is a powerful network simulation tool used for Cisco authentication training. It provides us with a good interface view for various routers and network devices. These simulation devices have many options. Like physical machines, we can use unlimited devices in the network. We c

Actually, for the tcpdump program, you can even say that this program is actually a customer experience, because not only can he analyze the packet flow direction, but the internal content of the packet can also be "audible". If the information you use is clear, on the router, it may have been heard by others! Awesome! So, let's get to know this experience! (Authorization: This tcpdump must use the root ide

Packet switching network is a new type of switched network after circuit switching network and packet switching network, which is mainly used for data communication. Packet switching is a kind of storage and forwarding exchange, it divides the user's message into a certain length of packet to

; -NDo not convert the network address into a name; -TNo timestamp is printed on each output line; -VOutput a slightly detailed information. for example, the IP package can contain ttl and service type information; -VvOutputs detailed message information; -CAfter receiving the specified number of packages, tcpdump stops; -FReads expressions from the specified file and ignores other expressions; -INetwork interface of the listener; -RReads packages from a specified file (these packages are genera

The common ICMP packet Echo is the consulting information. The ping command uses this type of ICMP packet. When the ping command is used, an ICMP packet of the Echo-query type will be sent to the target host, and after the target host receives the ICMP packet, the Echo-response type ICMP

Layer-3 Ethernet switches are quite common, so I have studied the problems related to the CPU packet sending and receiving of layer-3 Ethernet switches. I would like to share them with you here, hoping they will be useful to you. Layer-3 Ethernet switches are developing rapidly. On the one hand, bandwidth and switching capacity of network devices are greatly increased, and the types of protocols supported by devices are also increasing with the increa

Implement router and packet filtering firewall in Linux Router and Firewall]Vro is a widely used device between IP segments. There are many ready-made products on the market. In applications, we often connect routers across the WAN and lan. Most router products are designed based on this need. However, with the expansion of the user's IP network, we need a router that can address multiple Ethernet networks. The traditional router products occasionall

Network Packet monitoring using raw socket programming in C # Author: Unknown When talking about socket programming, you may think of QQ and IE. That's right. Many other network tools, such as P2P and Netmeeting, are implemented at the application layer using socket. Socket is a network programming interface that is implemented on the network application layer. Windows Socket includes a set of system components that fully utilize the features of Micro

Use libpcap for packet capture and package settlement on Ubuntu 14.04 64-bit For development purposes, I decided to use the latest libpcap source code package for installation. To install the libpcap library in a Unix environment, you mustC compiler, flex, bison, etc. These packages are not available when Ubuntu is installed. To install flex, the m4 compiling environment is required. Otherwise, the error "GNU M4 is required" is prompted. 1. Install th

I. FirewallOverviewNetwork Firewall is a technology used to enhance access control between networks and prevent external network users from illegally accessing internal networks and network resources through external networks, special network interconnection devices that protect the operating environment of internal networks. It checks data packets transmitted between two or more networks according to certain security policies to determine whether communications between networks are allowed and

1, in the NS simulation network, the Grouping (Packet) is the basic unit of interaction between objects. A grouping is a series of grouping headers and an optional data space composition. The structure of the packet header is initialized when the simulator object is created, and the offset of each packet header relative to the starting address of the

Analysis of data packet sending process in two-layer (link layer) Analysis of data packet sending process in two-layer (link layer)--lvyilong316 Description: The kernel version covered in this series of posts is 2.6.32When the upper layer is ready for a package, the link layer packet is sent to the link layer, which is handled primarily by the Dev_queue_xmit fun

When talking about socket programming, you may think of QQ and IE. That's right. Many other network tools such as P2P and Netmeeting are implemented at the application layer. Program Is also implemented using socket. Socket is a network programming interface that is implemented on the network application layer. Windows Socket includes a set of system components that fully utilize the features of Microsoft Windows message driver. The socket Specification Version 1.1 was released in January 1993

Transferred from Author's blog:Http://blog.csdn.net/cilong521/ When talking about socket programming, you may think of QQ and IE. That's right. Many other network tools, such as P2P and Netmeeting, are implemented at the application layer using socket. Socket is a network programming interface that is implemented on the network application layer. Windows Socket includes a set of system components that fully utilize the features of Microsoft Windows message driver. The socket Specification Versi

C # Raw Socket for network packet monitoring, Compared with Winsock1, Winsock2 supports the Raw Socket type most obviously. Using Raw Socket, you can set the NIC to the hybrid mode. In this mode, we can receive the IP packet on the network, of course, for the purpose of not the local IP packet, through the original socket, we can also more freely control the vari

Antpower All Rights Reserved 2003 Technical Articles Http://www.antpower.org 1st pages 14 pages Antpower-Technical article Introduction to three common IP packet sending tools Lang Guojun, an ambitious member of Xiaoyi Lgj@qingdao.cngb.com URL Revision Version date revised by description Antpower All Rights Reserved 2003 Technical Articles Http://www.antpower.org 2nd pages 14 pages 1. Introduction When developing network products, especially network s

I have seen many good articles on the Internet all day, but I found that most articles are either theoretical or too advanced. Detailed analysis of problems is rarely introduced. Today, I want to discuss Network Programming Problems with the topic of the data packet analysis program. I am also a newbie. If I have any problems, I hope you will not give me any corrections. Through the analysis of data packets, we can determine the system, network inform