When troubleshooting network issues like dropped packets or broken TCP handshakes you often require low-level visibility into what’s happening on the network.
That’s where network diagnostic tools come in. They help you understand how data moves through a network and where things might be breaking down.
Checkly provides:
- TCP dumps: capture network traffic to inspect packet-level behavior
- Traceroute report: trace the path your request takes across the internet
Whether you’re debugging a slow response or tracing a connection failure, these tools can help you get to the root of the problem.
TCP dumps
TCP dumps give you a detailed look at what’s happening at the packet level when a request fails. They capture the packets exchanged between Checkly and your target, letting you analyze things like:
- Did the TCP handshake complete?
- Was the TLS handshake successful?
- Were packets dropped, delayed, or malformed?
This level of visibility is especially helpful for diagnosing flaky networking behavior.
How to access
TCP dumps are currently only available for API checks.
.pcap file with the raw packet data from that request.
You can open this file using tools like Wireshark to inspect each packet in detail.
Traceroute report
Traceroute shows the path your request takes across the network and how each hop behaves. A report typically includes:
- The sequence of network hops between Checkly and your target
- Packet loss percentage per hop
- Latency statistics (last, average, best, worst, standard deviation)
This makes it especially useful for diagnosing:
- Where along the route packets are being dropped
- Which hops introduce unusual latency or instability
How to access
Traceroute is currently only available for API checks.
