Nest camera DHCP issues with new router software

[stroebs]

I've noticed Nest cameras have started having issues with newer router software, specifically with MikroTik RouterOS 7.3+, but may affect other vendors too. This seems to be related to the version of dhcpcd in use (5.5.6) in the Nest camera firmware and vendors using DHCP options slightly differently to how they were used before. From what I can tell, the only difference in the DHCP Offer packet is the ordering of the DHCP options sent by the router.

The behaviour:

- Device that was setup and working fine stops working (can't acquire an IP address) after a router upgrade - usually 1-3 days later once the existing DHCP lease expires

- New devices cannot join WiFi successfully due to the device not accepting the DHCP Offer and repeatedly re-sending a DHCP Discover packet to the router

For a more technical deep-dive, here is what a SUCCESSFUL packet looks like in Wireshark, when the DHCP Offer goes to the camera and the camera accepts it:

SUCCESSFUL DHCP Offer message from router (MikroTik ROS 7.2.1)

Here is what an UNSUCCESSFUL offer looks like, when the camera repeatedly sends DHCP Discover packets, despite having received this DHCP Offer:

UNSUCCESSFUL DHCP Offer message from router (MikroTik ROS 7.3.1)

[CarlyleMcHenry]

Well no wonder why I have wasted my afternoon.

[samcdonald]

I messaged Mikrotik Support about this last week after I determined what versions caused it,  the testing fix is in 7.4beta5

[Brad · Accepted solution]

Hey there,

I just wanted to jump in real fast and thank you for your feedback. Thank you for sharing this information you have found with the Community! Please feel free to submit your feedback to us. I've put instructions for feedback below.

• Open the Google Home app

• At the top right, tap your account.
• Tap Feedback 

• tap the type of device you'd like to submit feedback for.
• To display available emails, in the "From:" section, tap the arrow on the right. Select your email address.
• In the feedback summary, write a brief description of your issue.
• Be sure to check the box for Screenshot and System logs.
• To submit feedback, at the top right corner, tap Send 

If you need anything else, please let me know.

Best regards,

Brad

[Brad]

Hi there,

Just checking in to see how the conversation is going as there's been a lapse in activity on this thread.

Best regard,
Brad

[Brad]

Hi there,

Just checking in on this thread and the activity on it. We'll leave this topic open for another 24 hours in case there are any follow up questions or comments.

Best regards,
Brad