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0.0.0.0 is the service of each IP, which IP is the binding of the IP service.
2. Netstat-tln
Used to view the port usage of Linux
3./etc/init.d/vsftp Start
is used to start the FTP port ~!
4. Netstat
View the service ports that are already connected (established)
5. Netstat-a
View all service ports (listen,established)
6. Sudo netstat-ap
Use netstat in Linux to view the network status, port status (to), and linuxnetstat
Turn: http://blog.csdn.net/guodongdongnumber1/article/details/11383019
In linux, netstat is generally used to view system port usage.The netstat command is a very useful tool for monitoring
(192.168.128.1): Data bytes Request timeout for icmp_seq 0 Reque St Timeout for icmp_seq 1, Request timeout for icmp_seq 2, Request timeout for icmp_seq 3 Request Timeout for icmp_seq 5
If the destination host does not respond to an ARP request, or if the destination host is not in the line, you will receive a message like "host is down". This way you need to try to ping other hosts, if you still receive the message "host is down", then it means that your IP address i
The ADSL Broadband Access Network is still quite common, So I studied how to check the connection status of the ADSL Broadband Access Network. Here I will share it with you, hoping it will be useful to you. Now, there are more and more friends who use ADSL, LAN, and other broadband methods for high-speed Internet access, such as the LAN-based ADSL Broadband Acces
of the process (directory)--"for the benefit of other virus intrusion view illegal process." Stat Description:D a process that cannot be interruptedThe process of R run stateS Process in sleep stateT pause, Stop the processZ Zombie Process+ Foreground ProcessN Low-priority processesMemory paging is locked in memoryS master ProcessL Multithreading ProcessView network StatusNetstat (
, and network interface information.Options:A: Displays the status of all sockets.N: Print the actual address, add this parameter speed is relatively good, memory consumption is small.R: Prints the routing table.The listen represents a connection request that listens for TCP ports from afar. In this figure, receive any port from any IP to connect to the 22 port on this machine.Established represents an open
Tags: monitoring io performance FREE Command PS command View network status Linux under Grab BagMonitoring IO PerformanceIntroductionThe Iostat is primarily used to monitor the IO load on the system device, iostat the statistics from the start of the system startup when the first run, and then running Iostat displays statistics from the last time the command was
When the network is inaccessible, it is customary to see if there is anything unusual about the current network connection, WinXP users will typically click on the desktop's Network Neighborhood icon to view the properties of the Internet connection, and then view the
CLOSED: No connection is active or in progressEstablised: The state of the connection has been established;Syn_sent: Send the active line (SYN sign) of the connection packet;SYN_RECV: Received a request to connect the active connection packet;FIN_WAIT1: The socket Service (socket) has been interrupted and the connection is disconnected;Fin_wait2: The connection has been hung up, but is waiting for the other host to respond to the packet disconnection confirmation;Time_wait: The connection has be
This problem has plagued me for a long time and finally solved it. If you get the answer here, please have dinner! "/" Indicates a server error in the application.
An error occurred while verifying the view status Mac. If this application is hosted by a network farm or cluster, make sure that the
Note:An error occurred while executing the current Web request.
operation. The following figure:
By clicking the Finish button, the system creates a "local connection" icon on the desktop, and when you need to view the relevant network conditions, double-click to run it.
Many users are of the view that the right menu of resource managers, such as Windows XP and Windows 7, is "superfluous" and is always routinel
When using a computer, we often need to check the local network connection status, to find out which program is occupied by the flow, or to see if there are some garbage plug-ins are secretly transmission information. And once an unusual connection is found, we can turn it off to restore the normal state. Below, we will demonstrate the use of rising Personal firewall V16
occupied. Free can also add some parameters- m and- g(respectively, MB and GB units display) print memory usage, and even support- h optionPS commandviewing system processes using the PS command
[[Email protected] ~]# PS aux
There is a ps-elf command In addition to the PS aux command, but commonly used as PS aux commandPID: Indicates the ID of the process, which is useful. In Linux, the kernel management process relies on PID to identify and manage a process, such as the need to t
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 Net
state of the process).STAT (Status of the process) is:D cannot be interrupted.R (run) running process (CPU is used within a time period).The S (sleep) process may be paused and will be activatedT paused process (CTRL + Z paused process)+ Foreground ProcessZ Zombie ProcessN Low-priorityMemory is locked in memory pagingS master ProcessL Multithreading ProcessPS aux usage: see if a process is running (it has been used once) to see if top is runningps au
--use Netstat to view the network status-----------------------------2014/06/11One, the Linux server 11 kinds of network connection status:Figure: State machine for TCPNormally: a normal TCP connection, there will be three stages: 1, TCP three handshake, 2, data transmission, 3, TCP four waveNote: The following instruc
, buffer (buff) inside the memory.
Formula: Total=used + Free + buff/cache
The avaliable contains the free and Buffer/cache remaining portions.
PS command
PS aux
Static display of all processes
PS aux |grep nginx
View a process
[[emailprotected] ~]# ps aux |grep nginxroot 2757 0.0 0.0 112664 968 pts/0 R+ 20:57
PID: Process ID, used to kill a process, kill 2757
You may often encounter various router problems when working on network engineering. However, in addition to the configuration of a router, a more common method is to view network faults through the router port status. The following is a summary of my experience and I hope it will be useful to you.
Check the
]} 'LISTEN 3Established 3
Tcpdump
Install Yum install-y tcpdumpGrab Bag tool: tcpdumpUsage: TCPDUMP-NNThe first n indicates the IP display, and if you do not add N, the host name will be displayed.Listening for specified NICTcpdump-nn-i eth0[Email protected] ~]# tcpdump-nn-i eth0Listening on the specified portListening to the web port[[email protected] ~]# TCPDUMP-NN Port 80Monitor NIC Eth0 Port 80[Email protected] ~]# tcpdump-nn-i eth0 Port 80Do not listen on port 22Tcpdump-nn-i E
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