Lucid Hammering my DNS Server

[Haj]

I run a local AdGuard instance for DNS services at home. I have high 50s to 60s device on the network at any given time including TVs, phones, laptops, IoT devices, an LHCS and the AT. Recently (though not sure when it started), the AT has been making an inordinate about of DNS queries. For example, for the last 24 hours (car in the garage the entire time), AdGuard has received 180K queries. The AT makes up 26% of the traffic, >45K queries. The next closest client (IPV6 device that is iPhone or computer) is 15% of the traffic. 30K of the 45K AT queries are to connectivitycheck.gstatic.com, which is a a domain that Google uses to check if a device has internet access. I don't use Android on the AT so it seems something native to the AT firmware. Weird.

 

[segbrk]

Not weird. Pretty normal for an Android device, and Lucid's infotainment is an Android (Automotive) device.

 

[Haj]

Not weird. Pretty normal for an Android device, and Lucid's infotainment is an Android (Automotive) device.

A car sitting off for 24 hours should not be sending that traffic, IMO.

 

[segbrk]

Understood. Normally it does not even stay connected to WiFi 100% of the time. It will wake up every 3 hours or something like that to report in. Was it locked? Actively charging? Downloading an update maybe? If it keeps happening consistently while locked and not charging, you might have some kind of issue.

 

[skomarla]

I’ve never tracked it to that detail but my Lucid usually uploads 1-2gb daily on average. I just assumed it’s uploading training data from the cameras for future use.

Curious to see what others say.

 

[knewman]

That does seem like a lot of queries. I just checked mine, my AT has made ~23k requests over the past 7 days. Has your DNS server blocked any requests coming from the car? Maybe something's not able to connect and it's retrying.

As far as data transfer, mine shows just 142mb uploaded in the past 7 days.

 

[Tim-in-CA]

I have the same exact issue. My Air appears to keep a WiFi connection and make constant queries to:

connectivitycheck.gstatic.com
locs-vr-us.pictor.pdx.prod.dataconnectivity.lucidcars.io
mqtt-logs-prod.data.lucidmotors.com
mqtt-logs-prod.data.lucidmotors.com

In the past 24 hours, the vehicle has made 54,468 queries to these URLs and is the top client on my PiHole. Note, no queries are being blocked. Many days, the vehicle will remain silent for about 6 hours in the middle of the night, but today it didn’t. I haven’t noticed any battery drain as a result of this unusual behavior, but the activity seems excessive.

@marqie … is this expected behavior?

 

[Tim-in-CA]

I have the same exact issue. My Air appears to keep a WiFi connection and make constant queries to:

connectivitycheck.gstatic.com
locs-vr-us.pictor.pdx.prod.dataconnectivity.lucidcars.io
mqtt-logs-prod.data.lucidmotors.com
mqtt-logs-prod.data.lucidmotors.com

In the past 24 hours, the vehicle has made 54,468 queries to these URLs and is the top client on my PiHole. Note, no queries are being blocked. Many days, the vehicle will remain silent for about 6 hours in the middle of the night, but today it didn’t. I haven’t noticed any battery drain as a result of this unusual behavior, but the activity seems excessive.

@marqie … is this expected behavior?

Correction, URLs also include :
mqtt-test.data.lucidmotors.com
mqtt-mobile-prod.data.lucidmotors.com

 

[Haj]

Correction, URLs also include :
mqtt-test.data.lucidmotors.com
mqtt-mobile-prod.data.lucidmotors.com

Same urls for me with gstatic.com being 10X or more of the DNS queries compared to the other queries coming from the AT. I keep the AT connected to the LHCS whenever parked in the garage so as to support my Home Assistant charging automations. The AT stays on the network much of the time but still goes to sleep (doors locked and lag to wake the car using the app) which presumably means that the AT only uses OTA for app communication.

This is definitely a fairly recent phenomenon. I don't check AdGuard that frequently but I check it frequently enough to know that the AT used to not produce this amount of DNS traffic.

I'm also posting the total volume of all traffic to/from the AT on my network over the past 24 hours, week and month just to add to knowledge of AT network activity.

None this has any perceptible impact on network performance. Average DNS processing time for all queries is 8ms with the AT queries presumably being satisfied from the cache most of the time. 18GB of internet traffic over the past month is in the top 15 of clients on the network but still nowhere close compared the our main TV (400 GB) and my son's MacBook (600 GB) and a total of 1.43TB of total internet traffic over the same period.

 

[knewman]

Has anyone experienced any sort of negative impact because of this behavior? I've got to imagine this is just the reality of owning a connected car, especially one that is under heavy development as the Air is. I'm thinking Lucid is collecting data from a random sampling of vehicles for development purposes.

 

[borski]

Has anyone experienced any sort of negative impact because of this behavior?

No. Even the prior poster agreed that there has been no perceptible impact to network performance, and that’s been my experience as well. This is mostly just an academic exercise at this point, because people are curious, that’s all.

 

[Haj]

No. Even the prior poster agreed that there has been no perceptible impact to network performance, and that’s been my experience as well. This is mostly just an academic exercise at this point, because people are curious, that’s all.

While it is not impacting my network, I'm definitely curious why a parked and off car would generate such traffic - a request about every 0.5 second. I'm considering blocking the gstatic traffic and see if that impacts the AT.

 

[scal_air]

...I'm definitely curious why a parked and off car would generate such traffic

 

[ccarroz]

A car sitting off for 24 hours should not be sending that traffic, IMO.

I really have no clue how often it should be checking in, but in order for remote start to work and not me slow half the time you want to start the car, it will need to check in and let home know its still there and if there is a new request. I just looked at a bunch of other android devices on my network including things like a amazon fire cube and my phone. its all about the same. The reality is that is how these things need to work to meet your expectations on how responsive remote commands or test messages come in. The other option is it could only check in every 30 secs or a minute, but that is how long its going to take to send your start command. My guess is you would not be happy with a phone that only updated its text and e-mail every min. But hey, you would get better battery life...

 

[Haj]

I think that this behavior has nothing to do with remote start. Remote start must be OTA since it operates independent of WiFi connectivity.