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How do you isolate a printer in your homelab? (lemmy.zip)

submitted 9 hours ago by rearview@lemmy.zip to c/selfhosted@lemmy.world

34 comments fedilink hide all child comments

Hi all, I've gotten a Brother machine (DCP series) that can do wifi printing/scanning over their proprietary app. However, I'd like to lock it down from my network, because having it on the same LAN as my other devices and the ability to phone out to the internet seem like room for mischievious activities.

For context, I have OpenWRT on my router, and my clients can access the Brother using their iPrint&Scan app and AirPrint on wifi, as well as the traditional USB port. But I'm not good in networking. In my research, I drafted out the following solutions:

Create a firewall rule to block the printer itself from making outbound requests. Seems simple, but I'm not sure if this can persist after IP changes or not.
Create a VLAN for "IoT devices" that cannot send outbound requests to my normal VLAN nor the internet. Inspiration from this video, I'd need to manage a new SSID but it may come in handy for more IoT devices later.
Hook the Brother up to a Raspberry Pi via USB, and install CUPS + SANE on the Pi. Assuming the Pi cannot "phone home" on behalf of the printer, this makes it a local-only "print+scan service" on my normal network and doesn't require an extra VLAN.

I'd like to ask: which solution above is best for "neutering" the Brother? Or are there any alternatives/details I might've missed? I'm not sure if blocking outbound requests this way is enough of a security hardening for an untrusted device, and if there are any usability issues I've overlooked so far.

Thanks for any advice, and please share any printer/scanner setup you have in your networks as well. So hopefully I can get more inspiration!

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[–] Reannlegge@lemmy.ca 2 points 6 hours ago

This is just my story and how I have done/am considering looking at doing it. I to have a OpenWRT firewall, I to have lived in the Apple ecosystem my whole life, but I am slowly climbing out of it.

I have a Samsung laser printer of some sort, before I got into the whole home labbing and privacy thing I just had a raspberry pi of some sort (it rotated a few times because I was attempting the adblocking with pihole off and on). When I decided privacy was the better option and I had my pihole figured out I installed CUPS on a pi zero 2, I so rarely used the thing that it was not a thought for me to look up and install SANE I just used the app and the wifi from the printer. A day came a long when I had to do the wifi suffle to do the scanning when I thought there must be a better way and installed SANE. Fun side note; I have a perimant disability and see a physio, the insurance I have wants some paper work (that so rarely changes) every three months so I just have a script that looks at my calendar so the day of my physio treatments and counts the number of times I have seen them and prints out the documents if it is time to send them! So number 2 is my suggestion for sure if you are just beginning.

I have a vLAN (10.0.69.0/24) that my homelab sits on so my printer is attached to it that way with the pi I am using for CUPS and SANE, my HAOS pi is also on that vLAN and I see HA has something it can do with the printer I have considered looking at that once or twice. Now that you have mentioned this I may just read up on it because I have issues with SANE, not sure if it is configured correctly or my printer just really does not like it but if HA can do the things I may set it up and attach it to my IoT wifi vLAN (10.66.6.0/24) which does not access the outside world but HA and my 2 personal vLANs (10.42.0.0/24 for wifi and 10.4.20.0/24 for my VPN) can do things in it. I got into numbering my vLANs with fun combos when one day I was out and about when I could not connect to my VPN because it used the same IP range or something like that.

I use static IPs for everything within their own vLAN but I do not think it would be worth my time to set up firewall rules just for it when I have other options. If it does not need to phone home for anything other than data harvasting it is either not attached to the internet like my “smartTV” or it goes onto my IoT wifi that HA can do the stuff with.