this post was submitted on 03 Aug 2023
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I just did a test with my Brother printer on Windows. I saw one port opened for the print protocol and four or five for various name service protocols (because I have a homelab and have screwed around with DNS a little too much, apparently). If you're opening half of all possible TCP and UDP ports to get the printing protocol to work, you're doing something wrong.
I said "for all print protocols", as in all the ones network printers have to support to get all possible clients to work.
But why would you need to get all possible clients to work? Just get the ones that are actually on your network working. And don't open your Internet-facing firewall unless for some bizarre reason you have to print from over the Internet (can't really see a critical use case for this except for outliers).
Unless you're running a web cafe or something and have to support random laptops that people bring in. At that point security is out the window anyway because who knows what will be going on your network.
The point was that the protocols are badly designed and I was talking about firewalls between subnets.
If you have to print from a location away from your network ( like on a business trip ) us tailscale!