linux sniff network traffic

Article Title: Linux graphic traffic monitoring and I/O monitoring. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Iftop Tool Purpose: monitors the

can be seen that the packet group is received from the input NIC (entry) and searched through the route to determine whether the packet is sent to the local machine or needs to be forwarded. If it is sent to the local machine, it is directly submitted to the upper-layer protocol, such as TCP. If it is forwarded, it will be issued from the output NIC (exit. Network Traffic Control usually occurs at the outp

port information of the remote target host is displayed;Press p to toggle whether the port information is displayed;Press p to toggle pause/resume display;Press B to toggle whether the average flow graph bar is displayed;The average flow in 2 seconds or 10 seconds or 40 seconds is calculated by B switch;Press T to toggle whether the total traffic for each connection is displayed;Press L to turn on the screen filtering function, enter the characters t

At present, the internal LAN of many enterprises has been established, and many have also established the internal MIS System and email server on the basis of the LAN, the system even carries out services with large data traffic, such as on-demand video streaming. How to use it has become a topic of interest. Let's take a look at the specific application instances of Linux

Document directory Installation Method 2: (lazy method, simplest) 1. Description of iftop Interface 2. iftop Parameters Common Parameters Some operation commands after entering the iftop screen (case sensitive) In Unix-like systems, you can use top to view system resources, processes, memory usage, and other information. To view the network status, you can use tools such as netstat and NMAP. To view real-time

TC is very powerful ah, a lot of so-called hardware routers, are based on this.TC IntroductionIn Linux, TC has two control methods CBQ and HTB.HTB are designed to replace CBQ. It is a hierarchical filtering framework. TC consists of three basic constituent blocks: Queue rules Qdisc (queueing discipline), Class (classes), and classifiers (classifiers)Queue (queueing discipline): Used to control the network t

Article title: Linux Traffic control application example. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. At present, the internal LAN of many enterprises has been established, and

As we all know, in the beginning of the Internet are all universities and scientific research institutions to communicate with each other, and there is no network traffic control considerations and design, the principle of IP protocol is as good as possible for all data flow services, the different data flow is equal. However, years of practice have shown that this principle is not ideal, some data streams

In Linux, there are many ways to view Nic traffic. Next we will record several methods for viewing Linux Nic traffic and their respective features. It is displayed in text and text format. Let's take a look at the detailed introduction, which is required in the future.I. iptraf is a good tool for viewing

.tar.gzCD iftop-0.17./configureMake make installInstallation Method 2: (Lazy way, the simplest)Omit the above steps directlyCentOS System:Yum Install Flex BYACC libpcap ncurses ncurses-develwget ftp://fr2.rpmfind.net/linux/dag/redhat/el5/en/i386/dag/RPMS/iftop-0.17-1.el5.rf.i386.rpmRPM-IVH iftop-0.17-1.el5.rf.i386.rpmDebian system operation: Apt-get install IftopFour, running IftopDirect operation: IftopFive, relevant parameters and description1, Ift

Xt_mtchk_param *par){struct Xt_nfacct_match_info *info = par->matchinfo;struct NF_ACCT *nfacct;Nfacct = Nfnl_acct_find_get (info->name);if (Nfacct = = NULL) {Pr_info ("Xt_nfacct:accounting object with Name '%s '""Does not exists\n", info->name);return 0;}Info->nfacct = Nfacct;return 1;}XT_NFACCT.H:CP $3.3/include/linux/netfilter/xt_nfacct.h net/netfilter/xt_nfacct.hAt this point, the porting space is complete and the contents of makefile are:Obj-m +

TC IntroductionIn Linux, TC has two kinds of control methods CBQ and HTB. HTB is designed to replace CBQ. HTB is more flexible than CBQ, but CPU overhead is also greater, and usually high-speed links use CBQ, generally HTB used more broadly. HTB's rules are essentially a tree-like structure, consisting of three basic constituent blocks: The queue specifies Qdisc (queueing discipline), classes (Class), and Classifiers (classifiers).QdiscQueueRules(queu

In Linux, IP commands implement part of the functions implemented by most professional routers. The other command TC implements almost another function on professional routers, the remaining functions are all-inclusive. If you run another zebra, the Linux host will be an advanced router, and its speed will no longer depend on the software, however, it depends on your hardware. Although a complete

Recent work more or less with Linux flow control a bit of a relationship, since a few years ago know have TC such a thing and some understand its principle, I did not move it, because I do not like TC command line, is too cumbersome, iptables command line is also more cumbersome, But the TC command line is more intuitive than the TC command line, which is too technical. Maybe I don't have a deep understanding of the NetFilter framework for the TC fram

In Unix-like systems, you can use top to view information such as system resources, processes, memory consumption, and so on. View network status You can use Netstat, nmap and other tools. To see real-time network traffic, monitor TCP/IP connectivity, and so on, you can use Iftop.What is Iftop?The iftop is a real-time traffic