best free packet sniffer

Sniffit is a network listening software developed by Lawrence Berkeley Laboratory that runs on Linux, Solaris, SGI, NT, and other platforms. It is mainly designed for the insecure TCP/IP protocol, listen to the machine that runs the protocol. As with all Sniffer, data packets must pass through the machine running Sniffit to be monitored. Therefore, Sniffit can only listen to machines on the same network segment.Because Sniffit is easy to install and h

of processes because grep itself is a process. Four: View network status To print information such as network connection status, ports that are open to the system, routing tables, and so on. Common commands: NETSTAT-LNP print which ports the current system launches Netstat-an Print network connection status Tips: Netstat-an |awk '/^tcp/{++sta[$NF]} END {for (key in STA) print key, "\ T", Sta[key]} ' count the number of processes in all States focus on the number of established V: L

, the string is constantly refreshed, which is the flow of data transfer process and data packets, focusing on the third and fourth columns that represents which ip+ port is connected to which ip+ Port . Ctrl + C exits the program.The tcpdump also has the- C and- w options,-c Specifies the number of catches, and-W saves the crawl results to the specified path [Email protected] ~]# tcpdump-nn-i ens33-c 10-w/home/ask/documentation/ Besides, there are [[email protected] ~]# t

can catch the computer to access HTTPS requestThrough the above two steps can basically locate the network, fiddler, mobile phone equipment, which one of the problems, and then targeted to solve the problemIf it's a fiddler problem, consider two reasons.1) refer to the following tutorial to set up fiddler to see if it resolves. Http://jingyan.baidu.com/article/00a07f38bb4f4682d028dcd2.html2) If it is not resolved, the certificate may not be installed or is not available, refer to the following

PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMANDroot 1 0.0 0.6 128164 6824 ? Ss 5月06 0:02 /usr/lib/systemd/systemd --switched-root --system --deserialize 21root 2 0.0 0.0 0 0 ? S 5月06 0:00 [kthreadd]root 3 0.0 0.0 0 0 ? S 5月06 0:00 [ksoftirqd/0]....... How to see if a process is running, as in the following example:[[Email protected] ~]# PS aux | grep nginxRoot 44476 0.0 0.0 112676 984 pts