How to monitor network usage?

Monitoring network usage in Linux can be accomplished using various command-line tools that provide insights into network traffic, bandwidth usage, and active connections. Here are some commonly used tools and how to use them:

1. Using ifstat

ifstat is a simple tool that displays network interface statistics in real-time.

• Install ifstat (if not already installed):

  sudo apt install ifstat

• Basic Usage:

  ifstat

This command will show the incoming and outgoing traffic for all network interfaces.

2. Using nload

nload is a console application that visualizes network traffic in real-time.

• Install nload:

  sudo apt install nload

• Basic Usage:

  nload

This command will display a graphical representation of incoming and outgoing traffic for each network interface.

3. Using iftop

iftop is a real-time console-based network bandwidth monitoring tool that shows bandwidth usage on an interface.

• Install iftop:

  sudo apt install iftop

• Basic Usage:

  sudo iftop

This command will show a list of connections and their bandwidth usage.

4. Using vnstat

vnstat is a network traffic monitor that keeps a log of network usage over time.

• Install vnstat:

  sudo apt install vnstat

• Start the vnstat service:

  sudo systemctl start vnstat

• Basic Usage:

  vnstat

This command will display the total data transferred over the network interfaces since the last reset.

5. Using netstat

netstat provides information about network connections, routing tables, and interface statistics.

• Basic Usage:

  netstat -tuln

This command shows active TCP and UDP connections along with their listening ports.

Summary

• ifstat: Real-time interface statistics.
• nload: Visualizes network traffic.
• iftop: Monitors bandwidth usage per connection.
• vnstat: Logs network usage over time.
• netstat: Displays active connections and routing information.

Further Learning

To deepen your understanding of network monitoring, consider exploring relevant labs on LabEx that focus on network management and performance monitoring techniques.

If you have any more questions or need further clarification, feel free to ask!