this post was submitted on 23 Aug 2026
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Make no mistake, this is 100% going to be Comcast's alternative to more expensive surveillance options a la Flock, or workplace presence sensor arrays.

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[–] renegadespork@lemmy.jelliefrontier.net 88 points 2 days ago (8 children)

PSA: If you can afford your own a retail router, it’s always a better idea than using the one provided by your ISP. Make no mistake, Xfinity is absolutely collecting (and probably selling) data on the traffic of every device on your network.

[–] thisbenzingring@lemmy.today 32 points 2 days ago (6 children)

Ubiquiti isn't perfect but they make a really good product and you don't have to connect it with a cloud

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[–] DesertCreosote@piefed.blahaj.zone 13 points 2 days ago (1 children)

I work for a different large ISP who provides modems and routers to our customers, but not this specific feature (being a bit vague because I know at one point mentioning the company’s name on social media would result in the post being reviewed by the social media team/referred to security for anything discussing internal processes, and while Lemmy probably isn’t on their radar I’d rather not risk it).

The amount of data we can see if you’re using our routers is pretty crazy, and most people have no idea. We can see exactly what you have on your network and what it’s doing. If you’re just using the modem and not the router, we have much more limited visibility. We don’t have the capacity to monitor everything everyone is doing all the time, so if you’re using your own equipment (and you’re not using our DNS service), it’s unlikely we have much data on your activity. Storage in the scale needed to store what everyone is doing gets expensive.

I’ve always used my own equipment, and I make sure everyone in my family has their own equipment as well. I would absolutely advise against using your ISP’s equipment if your goal is privacy.

[–] Monument@piefed.world 6 points 1 day ago

I encourage everyone with the ability to do so to at least try to run their own networking, or even just periodically examine the logs. The weird things I’ve discovered about random devices on my network have made me seriously question what the fuck companies are doing.

[–] empireOfLove2@lemmy.dbzer0.com 15 points 2 days ago (6 children)

Xfinity is absolutely collecting (and probably selling) data on the traffic of every device on your network.

They're doing that anyway via the modem. Unless you are tunnelling everything your ISP sees every byte you send.

You can also get your own modem, but that doesn’t change the fact that yes, you need to use a VPN for any external traffic you don’t want your ISP seeing.

However, ISP controlled routers provide them direct visibility into your LAN, which they otherwise wouldn’t see. This gives WAY more detailed information about you and your behavior, i.e. the original article.

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[–] Skyrmir@lemmy.world 36 points 2 days ago (4 children)

Regardless of the basic privacy invasion that we all know Comcast is doing. Buy your own cable modem and router. Comcast charges you to use theirs, so they pay for themselves in a couple years.

[–] dan@upvote.au 13 points 2 days ago (6 children)

They used to charge you more for unlimited data if you didn't use their modem. Renting their modem plus getting unlimited data was $30/month, but just getting unlimited data with your own modem was $50/month.

Not relevant any more though, as (at least in my area) they completely removed the data caps.

I'm so glad I have a local ISP that provides 10Gbps for cheaper than Comcast's 1Gbps.

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[–] Raiderkev@lemmy.world 8 points 2 days ago

It's always been a ripoff from the start. The modem / router is far cheaper than whatever they charge you to rent it over a year. Additionally they were broadcasting public wifi hotspots from your rented modem for a while (probably still are) and now this. Having said that, walk into any random friend's house, and what will you see? A big stupid rented Comcast modem.

They've changed it since covid so now if you use their modem/router combo, you get unlimited data for free. If you don't use their modem and router, you have to pay $30/mo to remove the data caps or keep yourself under 1.2TB for the month.

[–] INeedANewUserName@piefed.social 3 points 2 days ago (4 children)

I tried... Comcast would "forget" the modem 3 times a month and would have to call and read them the MAC address again etc... fuck Comcast

[–] Raiderkev@lemmy.world 3 points 2 days ago (1 children)

So glad I was able to get an alternate ISP. A good chunk of my life, Comcast was the only high speed ISP in the area.

[–] INeedANewUserName@piefed.social 2 points 1 day ago (1 children)

If alternatives to Comcast were available was something I have been willing to pay higher rent for in my life.

[–] Raiderkev@lemmy.world 2 points 1 day ago

Yeah, I had a company called Wave that was since bought by or rebranded to Astound. I've had it about 8 years, and had maybe 2 outages. It's night and day.

[–] Skyrmir@lemmy.world 4 points 2 days ago (1 children)

Probably a modem problem honestly. I've been on and off comcast a few times and 3 different modems over the years. Only issue I've had were when my old ones got too out dated.

Possible that one was too new at the time but they claimed to support it was at the start of docsis 3.1 iirc as I had a similar issue with an older docsis 3.0 first

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[–] generic_computers@lemmy.zip 4 points 1 day ago

And you thought having to use Comcast was bad enough!

[–] BCsven@lemmy.ca 23 points 2 days ago (1 children)

Yep it will get used by advertisers to know how many times you get up while watching netflix, or by police to know when to conduct a raid.

[–] dan1101@lemmy.world 15 points 2 days ago

The internet is increasingly a weapon

[–] Kalon@feddit.online 5 points 1 day ago (3 children)

I had (still have) my own modem, but switched to their cheep "prepaid" Xfinity NOW service. Fast enough for my needs but I'm annoyed to learn I can only use the refurbished modem they have given me. No idea if its capable of presence monitoring but Its one of their old ones and I'm sure it already leaks metrics I'd rather not share.

[–] chiliedogg@lemmy.world 2 points 1 day ago

Wrap it in copper and run a hard line to a second router.

[–] Manjushri@piefed.social 3 points 1 day ago

OPs article links to another article at TechCrunch . That article states:

As first reported by The Verge, the new Wi-Fi Motion feature works for advanced Xfinity gateways XB7 and newer models and is opt-in, which means users can choose whether to switch on the feature in the Xfinity app.

So it seems like for now it's only this one model that can do it, if you believe them. Frankly, I wouldn't sniff that opt-in claim either because I'm fairly certain I know which orifice they pulled it out of.

If it's just a modem with no WiFi, then it's not capable of this specific thing.

[–] RoidingOldMan@lemmy.world 20 points 2 days ago

The Dark Knight surveillance tech is real life now. We're screwed.

[–] benjirenji@slrpnk.net 4 points 1 day ago

I like my no BS ISP that allows me to use any retail router matching their specs. One thing I just don't have to worry about.

[–] tynansdtm@lemmy.ml 14 points 2 days ago

I remember the scientific article of this technology as a proof of concept. Honestly it didn't take an ISP very long to ~~weaponize it~~ offer it as a service.

[–] SillyDude@lemmy.zip 11 points 2 days ago (1 children)

Last time I had to use their services I wrapped their modem/router that they forced me to use in a roll of aluminum foil and ran one short ethernet cable out to use my own router with whatever I want. Blocked all their public WiFi you can't turn off and roasted that thing. I was genuinely surprised that it still worked when I gave it back.

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[–] AlecSadler@lemmy.dbzer0.com 5 points 2 days ago (1 children)

Guess I'm injecting metal into my exterior walls and lining my blinds with tin foil

[–] TwodogsFighting 6 points 1 day ago (1 children)

Yup. Turns out the tin foil brigade were right the entire fucking time.

[–] tal@lemmy.today 5 points 2 days ago* (last edited 1 day ago) (3 children)

If Google and Apple start doing this with Bluetooth and WiFi on Location Services, they're not that far off the The Dark Knight sonar scene:

https://www.youtube.com/watch?v=IRELLH86Edo

[–] bless@lemmy.ml 5 points 2 days ago

Except that TDK is fiction, so the billionaire has morals

[–] Archer@lemmy.world 3 points 2 days ago

I did like that old Reddit post where someone did the math on the charges he’d get for this and everything else was a rounding error compared to the hacking charges

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[–] unitedwithme@lemmy.today 6 points 2 days ago

Fun fact: I have my device in airplane mode 90% of the time and only use WiFi. My device ID/name is "Unknown device" specifically so it looks like random or no good. I also use randomized Mac addresses.

I'm free of xfinity/Comcast, but for anyone else I know who uses it, I freely offer my professional IT tips to change DNS, recommend modem/gateway, etc.

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