Where the function is intended for
The recorder can record locally while app usage is absent, or cameras can receive a different network address. The symptom indicates which route should be investigated.
advice
Dahua cameras recover after router switch
A router switch can affect an existing camera installation, but resetting is rarely the first or most targeted step.
Setting or condition
Check what exactly changed: internet connection, Wi-Fi name, router range, DHCP, or only external access. Compare NVR recording with local and mobile app usage.
Making a conscious choice
Restore the network path and update documentation based on the new router settings. Keep fixed camera addresses and secure app pairing manageable instead of making separate exceptions.
What you check afterwards
Test all channels on the NVR, via internal network and via mobile internet. Check time, notifications and recording and note the new network data.
Frequently asked questions
Do I have to reset each Dahua camera after changing the router?
No. First investigate the address, recorder connection and external access.
Why does recording sometimes still work?
The local recorder route can be intact while the app or internet route has been changed.