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Network Troubleshooting Checklist
Initial Diagnostics
Verify physical connections and ensure cables are properly plugged in.
Check the status of network devices and ensure they are powered on.
Ping the default gateway to verify network connectivity.
Use traceroute to identify where the connection fails.
Confirm that the correct IP configuration is set on the client device.
Checking Network Devices
Log into routers and switches to check for error logs or alerts.
Ensure firmware and software are up to date on all network devices.
Verify VLAN configurations and ensure they are correctly assigned.
Check port statuses and ensure there are no port errors or shutdowns.
Review and confirm that routing tables are correctly configured.
Analyzing Traffic
Use network monitoring tools to analyze traffic patterns.
Look for unusual or high bandwidth usage that could indicate a problem.
Check for network loops or broadcast storms that may affect performance.
Examine firewall rules to ensure they are not blocking legitimate traffic.
Review Quality of Service (QoS) settings to ensure critical traffic is prioritized.
Wireless Network Issues
Verify that wireless access points are functioning properly.
Check wireless signal strength and coverage in the affected area.
Ensure SSIDs are correctly configured and broadcasted.
Confirm that wireless clients are connecting to the correct SSID.
Review wireless security settings and authentication methods.
DNS and DHCP Problems
Ensure the DNS server is reachable and responding to queries.
Verify that the correct DNS server addresses are configured on clients.
Check the DHCP server to ensure it is issuing IP addresses.
Confirm that the DHCP scope is not exhausted and has available addresses.
Review DNS and DHCP server logs for errors or unusual activity.
