howtouselinux

Solving a Networking Issue on Linux in 20 minutes

Table of Contents

Recently, the network at my workplace went down for a few minutes. I was tasked with investigating the issue and found that one of the network cards had failed.

Step by Step guide to Troubleshooting network issue

I started by checking the status of the network interface:

ifconfig eth0

The output showed that the interface was down. I then checked the kernel log:

dmesg | grep -i "error"

The output showed that the kernel had detected a problem with the network card and had disabled it.

I checked the hardware for any damage:

lspci -vvv

The output showed that the network card was still functioning properly.

I then checked the configuration of the network interface:

vi /etc/sysconfig/network-scripts/ifcfg-eth0

The output showed that the interface was configured correctly.

I restarted the network service:

service network restart

The output showed that the network service was restarted successfully.

I then checked the status of the network interface:

ifconfig eth0

The output showed that the interface was up and running.

I was able to fix the issue and the network was back up and running.

Conclusion

After some troubleshooting, I managed to fix the issue by following these steps:

  1. Check the status of the network interface using ifconfig
  2. Restart the network service using sudo service networking restart
  3. Reconfigure the network interface using sudo ifconfig eth0 down && sudo ifconfig eth0 up
  4. Finally, check the status of the network again using ifconfig to make sure it is now up and running.

 

reference: check network status in Linux

If you’re having trouble, feel free to reach out to me and I’ll be happy to help!

It was a great feeling to know that I had fixed the problem and kept the network up and running.

My experience with investigating this issue has taught me one thing: always be prepared to investigate any issues that might arise in a Linux environment – you never know what you might find!

David Cao
David Cao

Hey there! I am David, a Cloud & DevOps Enthusiast and 18 years of experience as a Linux engineer. I work with AWS, Git & GitHub, Linux, Python, Ansible, and Bash. I am a technical blogger and a Software Engineer, enjoy sharing my learning and contributing to open-source.