---
title: "POST /command/nd/sendNS"
method: POST
path: "/command/nd/sendNS"
---

# POST /command/nd/sendNS

`POST /command/nd/sendNS`

Force a router or LFN device to immediately re-register its GUA/ULA using its current lifetime. A router MUST send an NS(ARO), and an LFN MUST send an NS(EARO), to its parent with the lifetime previously configured with its /config/router or /config/lfn endpoint.

## Response `200`

Device will send a Neighbour Solicitaion with EARO.

## Other responses

- `400` — Device is not a Router or LFN.
- `default` — Unknown error occurred

## Changes

- **2026-07-17** `8475de394ee2` — 1 info
  - endpoint added
- **2023-07-24** `11bc7842d64c` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/siliconlabs/apis/tbu-api/changes/command/nd/sendNS/post.md)

---

[API](https://skmtc.dev/siliconlabs/apis/tbu-api.md) · [All operations](https://skmtc.dev/siliconlabs/apis/tbu-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/siliconlabs/tbu-api/revisions/8475de394ee2/schema)