Last Updated On: March 1, 2018 Welcome to netstat vs ss usage guide on Linux which tries to teach you usage of netstat and ss commands using examples. Linux Netstat Command This tool is very important and much useful for Linux network administrators as well as system administrators to monitor and troubleshoot their network related problems and determine network traffic performance. The simplest netstat command is just to run the tool without any parameter: netstat -t The result is a list of the current connections being made to your computer. Installing netstat on Debian 9 Stretch: netstat command is a part of the net-tools utility package on Debian 9 Stretch. This makes it a very useful tool for network and system administrators. Need to get 248 kB of archives.
The type of information printed is controlled by the first argument, as follows: none By default, netstat displays a list of open sockets. The -s parameter can be used to specify a set of protocols. The family is a comma-separated list of address family keywords like inet, unix, ipx, ax25, netrom, and ddp. The replacement for both is the ip command. In linux, netstat command tells us information of active sockets in system. The process details are made available by the 'p' option.
Simply run the netstat command with the a option. Send-Q Established: The count of bytes not acknowledged by the remote host. The address family inet includes raw, udp and tcp protocol sockets. You can also without commenting. Showing Kernel Interface Table Showing Kernel interface table, similar to ifconfig command.
It displays information about the Linux networking subsystem including data on open network connections, routing tables and statistics about the installed network interfaces. Options --verbose , -v Tell the user what is going on by being verbose. This is because your computer is constantly connecting to, and disconnecting from, various other devices on your network and over the internet. U The interface to be used is up. Some netstat commands correspond better to ip command. Such sockets are only included in the output if you specify the --listening -l or --all -a option. Foreign Address Address and port number of the remote end of the socket.
About Himanshu Arora Himanshu Arora has been working on Linux since 2007. If the —a option is also given, it prints all interfaces present in the kernel, not only those that have been configured currently. How to install netstat netstat is a useful tool for checking your network configuration and activity. Use this option twice for maximum detail. How to make netstat display kernel routing table? Netstat can be used to diagnose network issues and service problems.
Local Address Address and port number of the local end of the socket. If you want to see all listening ports, remove the t option. To get a more human friendly version of the output use the e option along with i. Replacement for netstat is ss. This has the same effect as using the --inet, --unix -x , --ipx, --ax25, --netrom, and --ddp options. So if you want to check whether any http server is running or not, or which http server is running, apache or nginx, then track down the process name.
But netstat cannot be replaced full by ss. You will also need superuser privileges to see this information on sockets you don't own. It provides a lot of features - we've just scratched the surface here. Similarly to list out only udp connections use the u option. You can not define more than one protocol at once, nor can you execute netstat with -p without defining a protocol. Disable reverse dns lookup for faster output By default, the netstat command tries to find out the hostname of each ip address in the connection by doing a reverse dns lookup. But there are two problems with this.
Send-Q The count of bytes not acknowledged by the remote host. To view only listening ports use the l options. Grep for http or smtp or whatever you are looking for. Since netstat man page says that netstat is obsolete, so we should use 'ss'. Display extended information on the interfaces similar to ifconfig using netstat -ie: netstat -ie : To display extended information on the interfaces Reference : This article is contributed by.
See the example below for more about using netstat -o. Such sockets are not included in the output unless you specify the --listening -l or --all -a option. Display network statics of all interfaces Interface stats can be viewed using the command option -s. Recv-Q The count of bytes not copied by the user program connected to this socket. This can be done using the -r command line option. This display will give you a list of all servers that are currently running on your system. Pointers will be very welcome.
Especially print some useful information about unconfigured address families. How to make netstat show only listening sockets? Note - If you use the n option with the e option, the uid would be listed and not the username. Print statistics The netstat command can also print out network statistics like total number of packets received and transmitted by protocol type and so on. The state of a port is either open, filtered, closed, or unfiltered. These are omitted by default. Replacement for netstat -i is ip -s link. It is in fact a collection of several tools lumped together.