> For the complete documentation index, see [llms.txt](https://docs.eseye.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eseye.com/hera604/diagnostics-and-maintenance/system-settings/network-time-protocol-ntp.md).

# Network time protocol (NTP)

Upload supported software to the Hera 604.

<figure><img src="https://333373795-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FBMckwRPzYNvOiZyh1fl3%2Fuploads%2Fw74T2sVVZewAUuRRzRS5%2FScreenshot%202026-08-14%20at%2016.59.41.png?alt=media&amp;token=b698aa57-819f-49eb-b596-3db6055b4638" alt=""><figcaption></figcaption></figure>

Open **Diagnostics & Maintenance > System Settings > Network time protocol (NTP)** to configure clock synchronisation.

| Field                                   | Description                                                                                                                                 |
| --------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
| Local NTP server                        | Enables or disables the router's local NTP server. This does not disable the router's NTP client.                                           |
| NTP servers                             | Lists the NTP servers used to synchronise the router clock. The screenshot shows `0.openwrt.pool.ntp.org` through `3.openwrt.pool.ntp.org`. |
| NTP pools                               | Lists any configured NTP pool sources.                                                                                                      |
| Use IPv4 for NTP server name resolution | When enabled, limits NTP hostname resolution to IPv4.                                                                                       |
| Minimum poll time                       | Minimum interval between NTP polls.                                                                                                         |
| Maximum poll time                       | Maximum interval between NTP polls.                                                                                                         |

If every NTP server is removed, the NTP client is disabled. Keep at least one reachable, approved time source. Accurate time is required for logs, certificates, and fault investigation.

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