Reolink PoE cameras and NVR can work without the internet, but the functions supported may be limited. 

Please check below.

Applies to: Reolink PoE cameras and NVR

1. Without NVR and router, a PoE camera can connect to your computer directly without internet

You need to use an Ethernet cable to directly connect your PoE camera to your computer. You may follow How to Connect Your Cameras Directly to the PC and Log in via Reolink Client to know how to access PoE cameras and NVR without the internet by connecting your devices directly. 

See the list below about the availability of each function under different circumstances.

Local Access  (in LAN) Yes
Remote Access  (in WAN) No
Local Live-view (in LAN) Yes
Remote Live-view (in WAN) No
Record to SD card Yes
Local Playback (in LAN) Yes
Remote Playback (in WAN) No
Audio Alarm Yes
Push Notification No
Email Alert No

2. With a router but no internet available                   

Local Access  (in LAN) Yes
Remote Access  (in WAN) No
Local Live-view (in LAN) Yes
Remote Live-view (in WAN) No
Record to SD card Yes
Local Playback (in LAN) Yes
Remote Playback (in WAN) No
Audio Alarm Yes
Push Notification No
Email Alert No

3. PoE camera connects to your NVR directly Without Network

When the PoE camera connects to your NVR directly, you can live view and playback on your NVR system and also set motion zone/sensitivity/ record schedule on the NVR system, but you can't add this NVR system to your phone app or PC client locally or remotely.