Monitoring settings
Defaults, timing limits, and the configuration scope.
Choose the scope first
Select Defaults for new targets or Selected target. The selected-target scope is available for a running or paused target. Editing defaults does not rewrite existing targets.
Use saved defaults for every new target is off by default. When off, new targets inherit the last-used probing configuration. When on, they use the saved defaults.
Supported settings
| Setting | Initial default | Allowed range or behavior |
|---|---|---|
| Packet type | ICMP | ICMP, TCP, UDP |
| TCP destination port | 443 | 1–65535; ignored for ICMP |
| Remembered UDP starting port | 33434 | 1–65535 |
| UDP port mode | Fixed port | Fixed or inclusive range |
| UDP ending port | 33625 | 1–65535; at least the starting port for a range |
| UDP packet size | 56 bytes | 56–65535; includes IP and UDP headers |
| Allow UDP IP fragmentation | Off | Path MTU can still restrict delivery |
| Network source | System route | Available interface/address or OS-selected source |
| Interval | 2.5 seconds | 0.1–3600 seconds |
| Timeout | 1 second | 0.1–30 seconds |
| Maximum hops | 30 | 1–64 |
| Concurrent hop probes | 6 | 1–32 |
| In-memory samples per hop | 1800 | 10–100000 |
| Resolve router hostnames | On | Reverse DNS names when available |
TCP and UDP ports are remembered separately. The underlying initial probe configuration has a destination-port field of 443; the UI remembers UDP's starting port as 33434 when switching protocols. Confirm the displayed port before applying a UDP configuration.
The memory limit controls live per-hop history, independently of the stored database. Interval is the requested cadence: a round that takes longer cannot produce samples at the requested interval. macOS ICMP traceroute uses a minimum one-second timeout.
UDP size includes a 20-byte IPv4 or 40-byte IPv6 header plus an 8-byte UDP header. Pngr does not silently truncate the requested packet. A UDP Port Unreachable response proves host reachability, not availability of a UDP service.
Interpret response loss carefully