this post was submitted on 09 Nov 2026
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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:

  1. 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.
  2. 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.
  3. 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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[โ€“] rearview@lemmy.zip 2 points 8 hours ago (1 children)

Damn, I didn't know devices do these dynamic MACs, but yeah it's not a trusted field to begin with.

By IPP autodiscovery, do you mean mDNS? If so, does the router needs to install avahi as well for single-network discovery to work? Or just the client?

Avahi on the router for multi VLAN discovery seem to be a nice idea, I'll look into it and maybe try to hook it up to solution 2. I've thought users could just manually input the IP addresses (and the non-tech users will just simply be onboarded by me anyways), but having it advertised by default may just be less of a hassle for them.

[โ€“] lemmyvore@feddit.nl 1 points 6 hours ago

IPP is a universal printer protocol aka "print anywhere". Some printers support it natively, some need some help from a PC. If that PC runs Linux the most likely method is to run CUPS and connect it to the printer over USB.

By IPP autodiscovery, do you mean mDNS? If so, does the router needs to install avahi as well for single-network discovery to work? Or just the client?

Yes the autodiscovery is done with mDNS, which on Linux is done with Avahi.

Typically Avahi is needed if you consume services over mDNS or provide them.

So the Linux clients need Avahi. But the router only needs Avahi if the printer is connected to it, or to propagate broadcasts across zones.

I've thought users could just manually input the IP addresses

You can, but it's really nice to have the printer available automagically (on any OS).

BTW one extra potential benefit of solution 3 might be that the "printer" would always appear to be present on the network and accept print jobs, even if the actual printer is off, because the Pi running the print server would actually be on. Otherwise if the printer itself is providing the connectivity and announcement it will not appear in the list when it's off. Whether you consider this a plus or not depends on how you handle your printers, I turn mine off when not in use, but some people let it go into powersaving mode so it's always ready to print.