Verified diagnostic signature
The host has no usable route or next-hop reachability for the destination.
Match output from network, understand the likely cause, then continue with sourced, read-only checks.
- Confidence
- high
- Platforms
- linux · macos · windows
- Verified
- 2026-07-24
Recognized output
Signature matched locally
Destination Host UnreachableOneLiners matches this pattern in your browser. Your pasted output is not stored or indexed.
Likely causes
What usually produces this signal
- Missing route
- Down interface
- Gateway or neighbor failure
- Policy routing mismatch
Safe next checks
Collect evidence before changing the system
Show the default network route
ip route show defaultThe output matches the expected target and exits without an error.
Resolve the exact Linux route, source address, and next hop to a host
ip route get <host>The output matches the expected target and exits without an error.
Sort the neighbor table by interface and reachability state
ip -j neigh show | jq -r '.[] | [.dev,.dst,(.lladdr // "-"),(.state[0] // "UNKNOWN")] | @tsv' | sortThe output matches the expected target and exits without an error.