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Trying to set a rule in my firewall and not sure if it's entered correctly. Can someone take a look to see if I have it done right? (lemmy.world)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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According to Brother (printer company) I need to set a rule for my firewall.

brother printer instructions

as you can see at that page it says :

To scan using the Scan Key Tool, open the following ports in the security/firewall software you use:

UDP: 54925
TCP: 54921

I think I have it correct. but i'm new to linux and to creating rules in firewalls.

Those screenshots of how i created the firewall rule. I have the incoming set to "Deny" but I would assume that means that normally deny incoming BUT the rules I created should be exceptions. At least that's how I would read that. If I am wrong please let me know.

The important part is that according to the instructions ports

UDP: 54925
TCP: 54921

must be opened and allow incoming traffic.

my end goal is to have the ability to push the "Scan" button on my printer/scanner and have a document scan and pushed to the computer. I am running Linux Mint 22.1

If you need more information to help me I'm happy to reply. The big item is :

is the firewall rule created correctly?

I should add that I did create a previous post about my brother printer and I went through brother to make sure the drivers are installed and setup . so that issue has been solved, now it's just the firewall.

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[–] [email protected] 2 points 1 month ago (1 children)

You have the from and to field set to the same IP. Shouldn't the from IP be the printer and and To field be your PC IP?

[–] [email protected] 2 points 1 month ago (1 children)

good point I read it as where my computer was getting the data from or sending it to. but i think you might be right.

although if my computer is dhcp (gets its ip from the router) then what would I put into the TO field?

or do i have to set my computers ip address so it is static?

[–] [email protected] 1 points 1 month ago (1 children)

Can you set the To field to 0.0.0.0/0

That way any IP your PC gets it will be listening for the printer.

[–] [email protected] 1 points 1 month ago* (last edited 1 month ago) (1 children)

ok updated the firewall as you suggested. still no joy for my scanner being able to scan a document and send it to the computer.

first: is the firewall set correct? (if it isn't then please let me know)

second: do i have to have a specific piece of software on my pc installed AND running? for example do i need to have Document Scanner running at the time when I hit try to scan the document or will linux just know to bring up a document scanner piece of software?

but the big item is the firewall, is it set right?

[–] [email protected] 1 points 1 month ago* (last edited 1 month ago)

yes, something must be listening on that port on the PC (it can be a service without a window). I think ss and lsof can be used to check that. Not sure if they need root to get the list if listening programs.