traceroute packet

, as determined by target: A. Continue to match next rule B. Make some changes to the packet C. Jump to another chain (that is, start by matching each rule in the chain sequentially) D. Returns the chain that raised the jump (that is, the next rule that continues to match the chain before the jump) E. Drop packet F. Receive packets (i.e. no longer continue to match down, return directly) G. Logging

origin:http://blog.csdn.net/e_wsq/article/details/12835457 For the TCP-based development of the communication program, there is a very important problem to be solved, that is, the packet and unpacking. Since I've been working on network communication programming (about three years), I've been thinking about and improving the way that packets and unpacking are addressed. Here's what I think about this question. If it's wrong, The wrong place, begged ev

Group First, let's look at the concept of the next grouping. The so-called grouping is to divide a packet into smaller packets. For example, for a 10GB packet, it is not always a one-time delivery of the past bar, but it is divided into a number of small packets sent past. Structure diagram for each block of data:File headers are typically descriptive data, such as source and destination addresses, data typ

Transferred from: http://cizixs.com/2018/01/13/linux-udp-packet-drop-debug?hmsr=toutiao.ioutm_medium=toutiao.ioutm_ Source=toutiao.ioRecent work encountered a server application UDP packet loss, in the process of reviewing a lot of information, summed up this article, for more people to refer to.Before we get started, we'll use a graph to explain the process of receiving network messages from a Linux system

From the simplest packet filtering firewall to the application layer gateway, since the date of birth, the firewall has increasingly assumed more and more network security role. In recent years, an innovative firewall technology is widely used, which is known as depth packet detection of dip (Deep Packet Inspection) technology.Historical ReviewBefore delving into

1. Circuit Switching Technology The network switching technology has gone through four stages: Circuit Switching Technology, packet switching technology, group switching technology and ATM technology. Both the Public Telephone Network (PSTN) and the mobile network (including the GSM network and CDMA network) Adopt the circuit switching technology. Its basic feature is that the connection-oriented approach is adopted before both parties can communicate

The process of sk_buff encapsulation and Network Packet encapsulation is described in detail.It can be said that the sk_buff struct is the core of the Linux network protocol stack, and almost all operations are performed around the sk_buff struct, its importance is similar to that of BSD's mbuf (I have read "TCP/IP details Volume 2"). What is sk_buff?Sk_buff is the network data packet itself and the operati

Use Python to write network packet sniffer (Code a networks packet sniffer in Python for Linux) by Silver Moon Basic SnifferSniffers is programs that can capture/sniff/detect network traffic packet by packet and analyse them for various reasons. Commonly used in the field of network security. Wireshark is a very common

A TCP sticky packet is a packet of packets sent by the sender to the receiver when it is received, viewed from the receive buffer, followed by the head of the packet data immediately preceding the end of the packet. The cause of the sticky packet phenomenon may be caused by

Basic use of the packet capture tool EtherealThis is a tutorial written by enthusiastic people on the Internet. I have put it into practice and it is very simple, but the basic work is enough. I will organize it for the moment.You can perform basic packet capture according to the steps. 1. Use the prefix parameter settings -- capture option settings Interface: Specifies the interface (NIC) on which the

The protocol number for OSPF is 89, and when OSPF packet multicasting occurs, their TTL is set to 1,1. Packet headerAll OSPF packets are started by a 24-byte eight-bit group header650) this.width=650; "Style=" Background:url ("/e/u261/lang/zh-cn/images/localimage.png") no-repeat Center;border : 1px solid #ddd; "src="/e/u261/themes/default/images/spacer.gif "alt=" Spacer.gif "/>650) this.width=650; "Style="

this This paper mainly introduces the realization of WEBRTC in Nack, Weizhenwei, the article was first published in the Wind network , Id:befoioSupport original, reprint must indicate the source, welcome attention to my public number blacker (Id:blackerteam or WEBRTCORGCN).In WEBRTC, forward error correction (FEC) and packet loss retransmission (NACK) are important methods to resist network errors. FEC adds a redundant error-correcting code to the

on the network. Therefore, the network analysis tools in the system are not a threat to the security of the local machine, but a threat to the security of other computers on the network. Tcpdump is defined as simple as possible, namely: dump the traffice on anetwork. a packet analysis tool that intercepts packets on the network according to the user's definition. As a necessary tool for the classic system administrator on the Internet, tcpdump, with

transmits data packets, if the length of the IP datagram plus the data frame header is greater than MTU, the data packets are divided into several parts for transmission and reorganized in the target system. For example, the maximum IP packet size (MTU) that can be transmitted over Ethernet is 1500 bytes. If the size of the data frame to be transmitted exceeds 1500 bytes, that is, the IP datagram length is greater than 1472 (1500-20-8 = 1472, normal

Author: sodimethyl Source: http://blog.csdn.net/sodme statement: This article can be reproduced, reproduced, spread without the consent of the author, but any reference to this article please keep the author, source and this statement information. Thank you!The common network servers are basically 7x24. For online games, at least require the server to work continuously for more than a week and ensure that no catastrophic event such as server crash occurs. In fact, it is almost unrealistic to req

The 1th chapter, router-based packet filtering firewall General concepts of 1.1 packet filtering firewalls 1.1.1 What is a packet filter firewall A packet filtering firewall is a software that looks at the header of the packet that flows through it, thus determining the fate

of the IP datagram plus the data frame header is greater than MTU, the data packets are divided into several parts for transmission and reorganized in the target system. For example, the maximum IP packet size (MTU) that can be transmitted over Ethernet is 1500 bytes. If the size of the data frame to be transmitted exceeds 1500 bytes, that is, the IP datagram length is greater than 1472 (1500-20-8 = 1472, normal datagram) bytes, the data frame needs

Document directory TCP packet TCP Reliability Assurance TCP data packets Source Port and destination port field -- each occupies 2 bytes. Identifies the application process of the sender and receiver. Number Field-4 bytes. Each byte in the data stream transmitted in the TCP connection is a serial number. The value of the serial number field refers to the sequence number of the first byte of the data sent in this section. The validation number

Programming | network Talking about socket programming, we may think of QQ and IE, yes. There are many network tools such as Peer-to-peer, NetMeeting and other applications implemented in the application layer, but also with the socket to achieve. The socket is a network programming interface that is implemented at the network application level, and Windows Sockets includes a set of system components that take advantage of Microsoft Windows message-driven features. The socket Specification versi

used to specify the maximum life cycle of each packet on the Internet. Each intermediate router reduces the TTL value by one before forwarding the IP packet to the next hop. A. Extract the final TTL value When a data packet arrives at the destination address to extract the TTL field value, this value is called the final TTL value. The challenge of hop count stat