linux packet sniffer

Analysis of the causes of UDP packet loss in Linux system kernel1. UDP Checksum ErrorPhenomenon: You can use NETSTAT-SU to see that there is a UDP error packet.Tcpdump catch packet, open the captured UDP message in Wireshark, turn on checksum option, error packet.Scenario: Finding link Failure www.ahlinux.com2, Firewall OpenSymptom: A package for a specific port

http://view.inews.qq.com/a/20161025A0766200QQ in narrowband eraQQ is a narrow band of the most representative of the product, in that network transmission efficiency is lower than the era, we still remember Google's homepage? Why is the simple page of Google so concise?Google was born in 1998, is also in the narrow-band era, you will find its home byte size is less than 1024, why less than 1024 bytes, because the Ethernet MTU (that is, the largest transmission unit) is 1024,google in order to le

It mainly analyzes the packet format of VLAN. At the same time, the application of vconfig command is explained. pc:10.10.107.168 ap:10.10.107.231 (eth0.100) 1: Add VLAN, use Vconfig. ~# Vconfig BusyBoxv1.10.3 (2012-09-23 02:13:20 CST) multi-call binary Usage:vconfig COMMAND [OPTIONS] ... Create Andremove Virtual Ethernet Devices Options: add [Interface-name] [vlan_id] REM [Vlan-name] Set_flag [Interface-name] [flag-num] [0 | 1] Set_egress_map [Vla

It mainly analyzes the packet format of VLAN. At the same time, the application of vconfig command is explained. pc:10.10.107.168 ap:10.10.107.231 (eth0.100) 1: Add VLAN, use Vconfig. ~# Vconfig BusyBoxv1.10.3 (2012-09-23 02:13:20 CST) multi-call binary Usage:vconfig COMMAND [OPTIONS] ... Create Andremove Virtual Ethernet Devices Options: add [Interface-name] [vlan_id] REM [Vlan-name] Set_flag [Interface-name] [flag-num] [0 | 1] Set_egress_map [Vlan-

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

"Copyright notice: Reprint please keep Source: Blog.csdn.net/gentleliu. E-mail: shallnew*163.com "Before processing the 2-tier packet, the kernel must process the interrupt system, set up an interrupt system, and possibly process thousands of frames per second.When a frame is received, the driver indicates that the device generates a hardware interrupt on behalf of the kernel, the kernel interrupts other activities, and then invokes a handler that is

:libedit ########################################### [100%]# RPM-IVH cdrom/packages/openssh-clients-5.3p1-52.el6.x86_64.rpmWarning:cdrom/packages/openssh-clients-5.3p1-52.el6.x86_64.rpm:header V3 rsa/sha1 Signature, key ID C105b9de:nokeyPreparing ... ########################################### [100%]1:openssh-clients ########################################### [100%]3, can also be installed directly by the following command:# yum Install openssh-clients Lin