Introduction
Network issues do not usually fail in one obvious way. Sometimes users report slowness. Sometimes websites stop loading. Sometimes only one application breaks while everything else looks normal. That is why anyone who is facing a network issue depends on troubleshooting tools, not assumptions.
In this blog post, we will explore the top network troubleshooting tools that are the secret weapons of IT professionals, enabling them to diagnose and troubleshoot network issues with ease.
Before moving on, let’s explore the best network troubleshooting tools like Ping, Traceroute, Wireshark, and Nmap with real-world use cases. If you want to learn these skills in depth, you can check out our CCNA training and network engineer course.
What are network troubleshooting tools?
Network troubleshooting tools help network engineers or anyone facing problem find, isolate, and explain network problems. There are different types of network troubleshooting tools.
- Some tools test connectivity.
- Some inspect packets.
- Some measure throughput.
- Some help verify whether DNS or routing is causing the issue
A good tool does not solve everything by itself. Its real value comes from showing one clear part of the problem. That is why engineers usually combine multiple tools in one troubleshooting session.
Let’s discuss these Network Troubleshooting tools in detail.
Top 12 Network Troubleshooting Tools
Here are the top network troubleshooting tools which can be used in any scenario to troubleshoot the issues:
1. Ping
The tool, ping of ICMP (Internet Control Message Protocol) is a basic network troubleshooting tool used to check connectivity or reachability with a device or a network. It stands for Packet Internet Groper and is widely used to troubleshoot. Ping provides various features like:
- Host/Server Reachability
- Internet Connection
- Issues with Network Interface Card
- To test DNS Issues
When you initiate a ping from the source to any destination, Echo Requests are sent from the source to the destination, to which the destination device sends Echo Reply as a response. In a scenario with no reply from the destination, we can understand that the reachability is not there. For example, receiving messages like Request timed out or Destination host unreachable means the destination device is not connected.
You can also use ping to check whether your network interface card is working correctly or not, called the loopback test. You can perform this by pinging localhost or the address 127.0.0.1; if you get all the replies, you can be assured that your Network Card is working properly, but if you don’t get the replies, there could be some issues with your network card.
2. Traceroute
This tool tells you the path a data packet takes to travel across the network and reach the destination. PCs and servers are connected over the Internet using thousands of routers. The traceroute utility allows you to find the exact path that packet takes over these thousands of devices to reach your destination from the source.
Traceroute utility is a bit different than the ping because it sends 4 data packets to the destination when you ping from a PC. Once they reach the destination, it will return your data packets to your computer, confirming connectivity.
Let’s try to traceroute the google.com. Go to my PC, open the command prompt, and type their tracert space the IP address or hostname of destination. In this case, we will use google.com and hit enter; after that, let’s observe the outcomes.
The first column tells us the number of hops or steps; the route taken to the destination, which was a total of 12 hops. The next three columns tell us the time each data packet took to each point and back to your computer. The last column tells us about the IP address of each router and the final destination, and it also tells us about the domain name, if available.
3. Ipconfig
ipconfig is a utility that can be used on a windows computer to display your IP address, the subnet mask, and the default gateway. It can be used for troubleshooting in many scenarios. Let’s go ahead and type IP config in the command prompt and hit enter to see the outcome of our devices.
So here is the basic network configuration of our computer, the IP address configured on this computer is 192.168.2.106, the subnet mask is 255.255.255.0, and the gateway this PC is using is 192.168.2.1. We also have an IPv6 address as we are under the migration from IPv4 to IPv6. To avoid any compatibility issues while accessing websites in servers during this migration, our PCs are configured with both IPv4 and IPv6 addresses.
Now, we are going to get more details out of the IP config command by typing ipconfig/all into the command prompt. It will display the full TCP/IP configurations of your network adaptors. It shows the additional information like hostname, MAC Address, details related to DHCP, and IP address of your computer’s DNS server.
4. NETSTAT
This tool displays the current network connections and port activity of your computer. Let’s quickly run the netstat command on our command prompt to see the outcomes.
When we run this netstat command, we get to see what all connections are established from our local PC using, what protocol at what particular address, and the state of those connections.
In these details, we can see that TCP is the protocol being used and our computer’s IP address, along with the port numbers used for that particular connection. And we can also see the IP address of the websites to which our computer is connected along with the protocol for websites, i.e., https.
5. NSLOOKUP
This is a DNS troubleshooting tool called NSLOOKUP. We can troubleshoot issues related to DNS using this great tool. We use this tool to query DNS or, in other words, to look up the DNS records. Let’s run the nslookup command followed by google.com on our command prompt and observe the outcome.
Here we can see the DNS records for google; we can see the IPv4 and IPv6 of google here in this outcome. Similarly, you can query the DNS for any other domain name. For example, amazon.com.
6. Wireshark
Wireshark is the tool engineers use when they need deeper visibility. It captures traffic and lets you inspect packets in detail. The Wireshark is a network protocol analyzer used to examine packet data as closely as possible.
Wireshark helps with:
- Protocol analysis
- Dropped packet checks
- Retransmission issues
- DNS and HTTP inspection
- Application-level troubleshooting
This is one of the most powerful troubleshooting tools available. It is also one of the easiest tools to misuse without a clear goal. That is why Wireshark works best after you already know what you are testing.
7. Tcpdump
Tcpdump is another packet capture tool, but it works from the command line. It is especially useful on servers and remote systems where a GUI is not practical.
It helps engineers:
- Capture traffic quickly
- Filter packets during live analysis
- Troubleshoot production systems with minimal overhead
Wireshark and tcpdump often complement each other. Tcpdump captures quickly whereas Wireshark helps inspect the packet file in more detail later.
8. Nmap
Nmap is one of the most useful discovery tools in networking. Nmap is a free and open-source utility for network discovery and security auditing. It is widely used to identify hosts, services, operating systems, and exposed ports.
Nmap is useful when you want to know:
- Which hosts are live
- Which ports are open
- Which services are running
- Whether a firewall may be filtering traffic
This makes Nmap especially useful before deeper troubleshooting begins. It tells you what is there before you test why it behaves badly.
9. iPerf
iPerf helps measure throughput between two systems. This makes it useful when users report that the network feels slow. The iperf3 measures maximum achievable bandwidth on IP networks and reports throughput, loss, and related parameters.
Use iPerf when you need to test:
- Whether a link performs as expected
- Whether bandwidth is lower than planned
- Whether packet loss affects throughput
- Whether one path performs worse than another
This is one of the best tools for performance-focused troubleshooting.
10. Curl
Curl is often treated as a developer tool, but it is also useful for network troubleshooting.
It helps test HTTP, HTTPS, APIs, redirects, headers, and response behavior.
That makes it useful when:
- Websites open slowly
- APIs fail
- TLS or certificate issues appear
- A service responds differently than expected
Curl is especially helpful when the network works, but the application still fails.
11. PuTTY/Tera Term
PuTTY and Tera Term are useful when engineers need direct access to devices. They help connect to routers, switches, firewalls, and servers through SSH, Telnet, or serial console.
This tool is useful when you want to:
- Access a device directly
- Verify interface status
- Check logs and system messages
- Inspect configuration from the CLI
12. IP Scanner
IP Scanner helps engineers quickly find active devices on a network. It is useful when you need a fast view of which IP addresses are responding in a subnet or local network.
This tool is useful when you want to know:
- Which hosts are online
- Whether an expected device is missing
- Whether an unknown device has appeared
- Whether the subnet is being used as expected
This makes IP Scanner useful early in troubleshooting. It does not replace deeper tools like Nmap or Wireshark. It helps engineers confirm what is present on the network before deeper testing begins.
Network Troubleshooting Tools By Use Case
Below, we have discussed the network troubleshooting tools in a tabular form to help you in choosing the right tool based on specific use case.
| Problem | Best tool to start with |
| Host may be unreachable | Ping |
| Domain not resolving | Nslookup / dig |
| Route looks broken or slow | Traceroute |
| Need packet-level proof | Wireshark / tcpdump |
| Need host and port discovery | Nmap |
| Need throughput testing | iPerf |
| Need HTTP or API testing | Curl |
| Need direct device access for CLI checks | PuTTY / Tera Term |
| Need to quickly find active devices on a subnet | IP Scanner |
Why Network Troubleshooting tools are Important?
Network troubleshooting tools are important because they help identify and investigate problems efficiently. It allows IT managers to detect network component problems, reduce downtime, and enhance the network’s quality of service (QoS) for users. These tools also provide efficient communication and collaboration between teams by providing a centralized platform to log and trace network events to resolve issues in real-time.
With an effective and reliable network monitoring system, they allow you to easily troubleshoot issues, instantly identify network slowdowns, analyze latency metrics, trace packets, and much more.
Network troubleshooting tools enable you to maintain the security and integrity of your organization’s network, protect sensitive data, and prevent costly breaches by analyzing network traffic, investigating unauthorized access attempts, and identifying vulnerabilities.
Frequently Asked Questions
Q1. What are the 4 network troubleshooting tools?
Some of the top network troubleshooting tools are Ping, Traceroute, Ipconfig, Netstat. All these network troubleshooting tools are considered best by all network admins.
Q2. What are the 7 steps of network troubleshooting?
The basic network troubleshooting includes these steps:
- Check the hardware to check if everything is connected properly.
- Finding the problem: Use various tools to identify the problem.
- Once you have found the problem, find the best way to solve it.
- Use the troubleshooting tools to test your theory.
- Implement the theory to your network.
- Test your network functionality again.
- Note the issue as it may appear again in the future.
Q3. What is the two network troubleshooting tools?
Ping and Traceroute are invaluable tools for network troubleshooting. They offer quick and straightforward methods to assess network connectivity, identify potential network disruptions, and gather essential information for further diagnosis.
Q4. What are the 5 types of troubleshooting?
These are the 5 Types of troubleshooting:
- Top-down method
- Bottom-up method
- Divide-and-conquer method
- Follow-the-path method
- Spot-the-differences method
These are the main methods of troubleshooting.
Conclusion
The best network troubleshooting tools do not replace good thinking. They support it. A strong network engineer does not collect tools randomly. By utilizing these top network troubleshooting tools, professionals gain the ability to swiftly identify network disruptions, diagnose bottlenecks, analyze packets, and ensure the overall health of their networks.
