Linux 101 : Netstat - A tool for troubleshooting networks and sockets
Sockets:
Sockets are an interface between programs across the network.
The main two types of sockets are TCP and UDP.
- TCP : provides a system that allows two communicating application to know whether data was sent successfully.
- UDP : is lighter than TCP because it doesn't provide a verification system for packets like TCP.
Using netstat to display network interfaces:
We display the network interfaces on a system using:
Displaying the routing table:
To display the routing table we use:
To display the IDs of the processes that own sockets on a system, we use:
Displaing the listening sockets:
To display the sockets that are listening on a certain port, waiting for incoming connections, we use:
Displaying TCP protocol socket:
To display the TCP protocol sockets, we use:
Displaying TCP protocol socket:
To display the UDP protocol sockets, we use:
Displaying sockets for a certain network interface:
To display the sockets for a specific network interface, we use:
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