- Networks
- Security cameras
C105
Google Nest C105 on camera: router assigns no address
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
C105, C226 or C326 mean your router couldn't assign a network address to the Nest camera. Check the router has DHCP enabled and, if it uses MAC filtering, that the camera's MAC address is on the allowlist.
Safety first
Stop and check this first
- If you don't know how to change router settings, Google recommends asking the person or provider who set up your wifi.
Safe checks you can perform
- Phone on the same network
- Router DHCP
- MAC filtering and camera restart
Leave these tasks to a qualified professional
- Do not attempt this professional task: Adjust router DHCP and MAC filtering
- Do not attempt this professional task: Escalate to Google Nest support
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Adjust router DHCP and MAC filtering
What they doYour network technician or provider checks DHCP is on, adds the camera's MAC to the allowlist if filtering is used and reviews Google's recommended settings.
They must show youDHCP on, the camera's MAC allowed and the camera with an assigned address.
In writingwhich router settings were changed.
Escalate to Google Nest support
What they doWith the router checked and the code repeating, Google support analyses the case.
They must show youthe data their diagnosis is based on.
In writingthe case number and conclusion, with the reason if they propose replacing the camera.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Phone on the same network
- Who:
- you.
- How:
- quit the app and check the phone's wifi is on and on the same network the camera will use.
- Result that matters:
- same network on both.
- If it was on another network:
- fix it and retry.
- If it matches:
- the problem is in the router settings.
- Evidence to keep:
- screenshot of the network name.
Evidence: Troubleshoot Nest camera and doorbell setup messages
Router DHCP
- Who:
- whoever set up your wifi or your provider, or you if you can access the router.
- How:
- in the router's local network settings check DHCP is enabled, as Google asks.
- Result that matters:
- whether DHCP is on.
- If it was off:
- enable it and retry; that was the cause.
- If it was already on:
- check MAC filtering.
- Evidence to keep:
- screenshot of the DHCP setting.
Evidence: Troubleshoot Nest camera and doorbell setup messages
MAC filtering and camera restart
- Who:
- whoever manages the router, or you.
- How:
- if the router uses MAC filtering, add the camera's MAC address to the allowlist; then restart the camera and set it up again.
- Result that matters:
- whether the camera gets an address and finishes setup.
- If it finishes:
- the filter was blocking the camera.
- If the code remains:
- review Google's recommended router and access point settings with whoever manages the network.
- Evidence to keep:
- screenshot of the allowlist with the camera's MAC.
Evidence: Troubleshoot Nest camera and doorbell setup messages
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Networks
- Brand
- Google Nest
- Product type
- Security cameras
Known code variants
- C105
- C226
- C326
- cámara Nest DHCP
- Nest Cam C105
- Nest camera DHCP
What it means
Google explains that C105, C226 and C326 mean the router couldn't assign a network address to the camera, and that several router settings could cause it. Nest Cam uses DHCP to join the wifi network, so the router must have it enabled; if the router uses MAC filtering, the camera's MAC address has to be added to the allowlist, and Google also recommends specific router and access point settings. The code points to the router, not the camera.
Warnings and stop conditions
- Lowsource verified
If you don't know how to change router settings, Google recommends asking the person or provider who set up your wifi.
Evidence: Troubleshoot Nest camera and doorbell setup messages
Symptoms and causes
Probable causes · in order
- DHCP disabled on the routerCommon
Without DHCP the camera gets no address. The router's local network settings confirm it.
Evidence: Troubleshoot Nest camera and doorbell setup messages
- MAC address filteringCommon
If the router only admits listed devices, the camera stays out until its MAC is added.
Evidence: Troubleshoot Nest camera and doorbell setup messages
- Other router settings outside recommendationsPossible
Google points to its recommended router and access point settings when DHCP and MAC are fine.
Evidence: Troubleshoot Nest camera and doorbell setup messages
Virtual technician
Does C105 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Troubleshoot Nest camera and doorbell setup messages
Google · 2026 · official_doc
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