best packet sniffer

Under Linux, when we need to crawl network packet analysis, we usually use the Tcpdump crawl Network raw packet to a file, and then download it locally using the Wireshark Interface Network analysis tool for network packet analysis.Only recently found that the original Wireshark also provided with the Linux command line tool-tshark. Tshark not only has the functi

First, a sample from a Shehiren teacher's book is referenced:Host H1 the process of sending packets to H2:First, with the subnet mask in the subnet:255.255.255.128 and target host H2 IP address:128.30.33.128 and get network number: 128.30.33.128. Obviously this does not match the network number of Subnet 1:128.30.33.0.The datagram is then forwarded by the default route R1 Subnet 1. At this point, R1 will look for its own routing table. Think of the host address and subnet mask of the H2, and whe

The title of the article is a bit around the mouth, like the execution of a command pipe, oh, because the server Setup problem can not upload too large compression package, this compression package can not continue to pass the breakpoint, all can only cut, in Windows under the use of software can be easily done, then in Linux how to solve it, It takes only two commands to handle it easily:Let's see the first command:Cat Jordan_shoes.tar.gz|split-b 100m–jordan_shoes.tar.gz.Explain:The-jordan_shoe

vswitch, connect one by one, and check whether the connection is normal until the connection is interrupted. Then we can determine which network cable is faulty, find the problematic host through the network cable. . Virus detection and removal can generally solve the problem. However, we can see that this workload is very large. If there are enough switches and there are more than one faulty computer, it will take a long time for us to completely solve the network problem. However, we have a t

= socket. IOControl (Sio_rcvall, in, out); Is the most critical step in the function, because, in Windows we can not use the receive function to accept data on the raw socket, this is because all IP packets are handed to the system core before transmission to the user program, when sending a raws When the socket packet (such as SYN), the core does not know, there is no data is sent or connected to establish the record, so when the remote h

because all IP packets are handed over to the system core first. And then transferred to the user program, when sending a Raws socket packet (such as SYN), the core does not know, and there is no record of the data being sent or connected, so when the remote host responds, the core of the system discards all of the packets, which can not reach the application. Therefore, you cannot simply use the receive function to receive these datagrams. To achiev

whether there is any traffic exception. Network Traffic Analysis Process 1. Overall Network Traffic Monitoring We first use the History Samples historical sampling function of Sniffer Pro to monitor the network utilization on the image link. The following results are obtained: Link to utilization The link actually transmits numbers per second. From the above monitoring results, we can see that in every 40 seconds, the network traffic in this link

over to the system core first. And then transferred to the user program, when sending a Raws socket packet (such as SYN), the core does not know, and there is no record of the data being sent or connected, so when the remote host responds, the core of the system discards all of the packets, which can not reach the application. Therefore, you cannot simply use the receive function to receive these datagrams. To achieve the purpose of receiving data, a

The use of the raw socket these days, with Python to write some demo program, recorded here. First, let's look at a simple sniffer program: Copy the Code code as follows: #! /usr/bin/python # code for Linux Import socket #s = Socket.socket (socket.af_inet, socket. SOCK_RAW, Socket. IPPROTO_UDP) s = socket.socket (socket.af_inet, socket. SOCK_RAW, Socket. IPPROTO_TCP) While True: Print S.recvfrom (65535) The data is received directly from the raw s

specially used to capture HTTP and HTTPS. Wireshark can obtain HTTP and https, but cannot decrypt https, so Wireshark cannot understand the content in https To sum up, if HTTP and HTTPS are processed, or Fiddler is used, other protocols such as TCP and UDP use Wireshark.Other similar tools Microsoft Network Monitor Sniffer Who will use Wireshark? 1. The network administrator will use Wireshark to check network problems 2. Software Testing engineers

Tcpdump is a Sniffer tool, which is actually a packet capture tool on the network. It can also analyze captured packets. Generally, the system is installed by default. Tcpdump command description: tcpdump uses the command line method. the command format is: tcpdump [-adeflnNOpqStvx] [-c quantity] [-F file name] [-I network interface] [- TcpdumpIt is an Sniffer to

During the packet capture module, we have seen some data packet interception methods as follows:1. Use the pcap software package. The Linux version of pcap is the Libpcap function library, and the corresponding function library in Windows is Winpcap. The protocol analysis software etheral is implemented based on this software package (but not limited.2. Use the original socket. For example, the UDP proxy se

specified content.5. Good compatibility, support for win7 2008, etc.6. Do not install wincapDisadvantage: 1. You cannot only capture the specified process.2. Wincap is required. Some administrators have made restrictions and cannot install Wincap.6 sniffer pro (network packet capture tool)I have never used it. I have installed it before. I have seen that the software is too big. The most important thing is

already has a file that only filters ICMP, you can select "Copy Sample Profile", select IP/ICMP, and click OK. (4) Of course, you also need to Define "address" in the Define Filter window to capture ICMP traffic between the local host and any host. 3. capture process Run Sniffer Pro, click F10 to start the capture process, open a CMD window on the local machine, and send TRACERT-d 10.4.153.165 (when the tracert command with the-d option is used, TRAC

Original article reprinted, please note: Reprinted from guanwei blog [http://www.guanwei.org/]Link: http://www.guanwei.org/post/securitytools/10/Colasoft-Packet-Builder.html FindWindowsUnderPacket sending ToolI searched the internet and found three recommended software: sendip, Sniffer, and Nessus. However, sendip is only available in Linux. I cannot install sniffer