Network Path Terms and Concepts
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Network Path
Network Path provides hop-by-hop visibility into the route between a source and destination, helping you identify where latency, packet loss, or routing changes occur.
Terminology
| Concept | Description |
|---|
| Network Path | Network Path provides hop-by-hop visibility into the route between a source and a destination, so you can identify where latency, packet loss, or routing changes occur. |
| Autonomous System (AS / ASN) | A collection of IP routing prefixes managed by a single network operator. Network Path groups hop by Autonomous System (AS) or Autonomous System Number (ASN) to show routing domains along the path. |
| Path View | The Network Path visualization that displays each hop, grouped by Autonomous System Number (ASN), region, or network, along with probe status and hop metrics. |
| Hop | A network node along a route between source and destination, identified by IP address and associated metadata (ASN, cloud region, provider). |
| Source | The starting point of a Network Path probe, typically an Agent-monitored host or container running the Datadog network monitoring tracer. |
| Destination | The endpoint that the Network Path probe is targeting, such as a service, public endpoint, or domain. |
| Traceroute | The mechanism that Network Path uses to determine intermediate hops and latency. CNM sends controlled probes, similar to traceroute, to discover each hop on the route. |
| Latency per hop | The round-trip time between the probe source and each hop. This helps identify slow or congested nodes. |
| Packet loss per hop | The percentage of probe packets dropped before reaching or returning from a hop, useful for diagnosing reliability issues. |
Path View
| Concept | Description |
|---|
| Aggregated hop | A group of multiple identical hops (same IP, ASN, region), collapsed into a single representation to simplify visualization. |
| ICMP timeout or no response | A hop where no ICMP response was received. Often appears as a gray or unknown hop in the Path View. |
| Missing hop | A point in the path where the probe cannot identify a network node, often due to firewall filtering, ICMP rate limits, or private routing. Displayed as a dashed or empty hop. |
| Path change indicator | A visual marker that shows when the observed route changes over time, for example an AS shift or a new hop. |
| AS grouping | The cluster of hops belonging to the same Autonomous System, helping identify which network operator controls each segment of the path. |
| Region grouping | The cluster of hops located within the same cloud region or geographic region. Helpful for identifying inter-regional routing. |
| Start node | The initial node (source) where the probe begins. Represented at the far left of the Path View. |
| End node | The destination node where the probe terminates. Represented at the far right of the Path View. |
| Hop status indicator | The icon or color indicating whether the hop is healthy, degraded, or unreachable, based on latency and loss. |
| Probe status | Shows whether the probe reached a hop successfully, partially, or not at all. This helps you identify where traffic stops or degrades. |
| Traversed count | Represents the number of traceroute active probing packets received by reach hop. Higher counts suggest that the hop is consistently part of the route; lower counts may indicate path instability. |
| Traversal completion | Represents whether or not the traceroute was able to successfully reach the destination. |
| Reachability | The level of packet loss the destination is experiencing. |
| Latency | How long the traceroute took to get from a source to its destination. |
Further Reading
Documentation, liens et articles supplémentaires utiles:
