In this tutorial we’re going to share Top linux commands to Troubleshoot Network Issues. Linux systems’ performance, one must look for difficulties with the CPU, RAM, disc I/O, network usage, and general responsiveness of the system. You can use the following popular Linux commands and utilities to troubleshoot performance issues:

1. ping Command

Tests connectivity to a remote host.

ping wizbrand.com

2. netstat Command

Displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships.

netstat -tuln

Output: –

3. ss Command

Displays socket statistics.

Example :-

ss -tuln

4. ifconfig Command

Displays or configures network interfaces.

Example :-

ifconfig

5. ip Command

Provides extensive networking information.

Example :-

ip addr show

6. arp Command

Displays the ARP cache.

Example :-

arp -a

Output:-

7. route Command

Displays and manipulates the IP routing table.

Example :-

route -n

Output :-

8. dig Command

Performs DNS lookup and displays the response.

Example :-

dig wizbrand.com

Output:-

9. host Command

Performs DNS lookup and displays the response.

Example :-

host wizbrand.com

Output:-

10. uptime Command:

Displays system uptime and load average.

Example :-

uptime

11. free Command

Displays free and used memory in the system.

free -m

Output:-

12 df Command

Displays disk space usage.

Example :-

df -h

13 du Command

Displays disk usage of files and directories.

Example :-

du -sh htdocs

Output:-

14. ps Command

Displays a snapshot of current processes.

Example:-

ps aux

Output:-

15. ufw Command:

Uncomplicated Firewall, a user-friendly interface to manage iptables firewall.

Example :-

ufw enable

16. iptables Command

Configures firewall rules.

Example :-

iptables -A INPUT -p tcp --dport 22 -j ACCEPT

17. fail2ban Command

Protects against brute-force attacks by monitoring logs and blocking malicious IP addresses.

Example :-

fail2ban-client status

18. sudo Command

Allows users to execute commands with superuser privileges.

Example :-

sudo command

19. ssh-keygen Command

Generates SSH key pairs for authentication

Example:-

ssh-keygen -t rsa

20. top Command

Displays real-time information about system processes and resource usage.

Example:-

top

Output:-

Thanks for learning 👍👍