#Troubleshoot #network issues in #Linux

 

1. Check network connectivity: Verify that your network connectivity is working by pinging a known working IP address. For example, you can try to ping the Google DNS server at 8.8.8.8 using the command ping 8.8.8.8 or any existing IPs, If the ping succeeds, then your network connectivity is working, and the issue may be with specific applications or services.

2. Check network configuration: Verify that your network configuration is correct by checking the network configuration files such as /etc/network/interfaces or /etc/sysconfig/network-scripts/ifcfg-eth0. Make sure that the network settings such as IP address, subnet mask, gateway, and DNS servers are correctly configured.

3. Check network services: Check that the necessary network services are running using the systemctl command. Check the status of the network service using the command systemctl status network.service. Also, check that the DNS service is running using the command systemctl status systemd-resolved.service.

4. Check firewall settings: Check your firewall settings to ensure that they are not blocking necessary network traffic. You can check the status of the firewall using the command systemctl status firewalld.service. If the firewall is blocking network traffic, you can either modify the firewall rules or temporarily disable the firewall to test connectivity.

5. Check network hardware: Verify that your network hardware is functioning correctly. Check that the network cables are properly connected and not damaged. You can also check the network card status using the lspci command.

6. Check log files: Check the system logs for any errors related to network connectivity. You can check the logs using the journalctl command or by checking specific log files such as /var/log/syslog or /var/log/messages.

7. Check the system logs for any error messages related to network connectivity. Use the dmesg command to view the kernel logs, or check the system log files in /var/log/.

8. Check routing: If you are having trouble connecting to devices on another network, you should check the routing configuration. Use the route or ip route command to view the routing table and ensure that there is a route to the destination network.

9. Check DNS settings: If you are having trouble resolving domain names, you should check the DNS settings. You can use the nslookup command to query a DNS server for a specific domain name and IP address.