Basic Linux networking commands

Command w : Shows who is currently logged in system

Command who : shows who is on logged in on the server in an shell

Command netstat : Shows all current network connections

Command netstat -apn : Shows all connections to the server, the source and destination ips and ports

Command netstat -rn : Shows routing table for all ips bound to the server

Command top : Shows live system processes in a formatted table, memory information, uptime and other useful info
While in top, Shift + M to sort by memory usage or Shift + P to sort by CPU usage
Command top -u root : Show processes running by user root only

Command route -n : Shows routing table for all ips bound to the server

Command nslookup yahoo.com : Query your default domain name server (DNS) for an Internet name (or IP number) host_to_find

Command traceroute yahoo.com : Have a look how you messages travel to yahoo.com
Command tracepath yahoo.com : Performs a very similar function to traceroute
Command ifconfig : Display info on the network interfaces
Command ifconfig -a : Display into on all network interfaces on server, active or inactive..
Command ping : Sends test packets to a specified server to check if it is responding properly
Command ping yahoo.com : Sends echo requests to yahoo.com
Command mii-tool : Checks what your duplex settings are.
Command arp : Command mostly used for checking existing Ethernet connectivity and IP address
Command hostname : Tells the user the host name of the computer they are logged into.
Command findsmb : Used to list info about machines that respond to SMB name queries. findsmb with no argument would find all machines possible. You can also specify a particular subnet to localize search.
Command host yahoo.com : Performs a simple lookup of an internet address using DNS.
Command dig yahoo.com : The "domain information groper" tool. This example looks up information about yahoo.com such as IP.
Command dig -x 66.94.234.13 : Looks up the address and returns the associated domain name. dig takes a huge number of options (at the point of being too many), refer to the manual page for more information.
Command whois : Used to look up the contact information from the “whois” databases. Also reports IP address and name server of domain as well as creation and expiration dates..
Command ftp : File transfer protocol. Transfers files to another host (insecure)
Command rdesktop : Display remote desktop on Linux Machine. You can use to connect to Windows.

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