Firewalls: what SHOULD I block? (lemmy.wtf)

submitted 13 hours ago by [email protected] to c/[email protected]

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Hey there folks,

I'm trying to figure out how to configure my UFW, and I'm just not sure where to start. What can I do to see the intetnet traffic from individual apps so I can know what I might want to block? This is just my personal computer and I'm a total newbie to configuring firewalls so I'm just not sure how to go about it. Most online guides seem to assume one already knows what they want to block but I don't even know how/where to monitor local traffic to figure out what I can/should consider blocking.

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[-] [email protected] 9 points 12 hours ago

UFW

This is just my personal computer and I'm a newbie to configure firewalls

Leave it alone.

If you want to experiment, set up a VM and experiment there.

Also, if you want to learn about Linux firewalls, go for iptables instead. UFW is easier, yes, but you won't get the standard way of configuring a Linux firewall, though to be honest, unless you are directly connecting the computer to the internet, you probably won't need to bother.

And if you are working in an environment where you are dealing with a segmented network with limited access between segments, they will probably already use a separate firewall that is easier to manage centrally than induvidual firewalls running on individual computers

[-] [email protected] 2 points 2 hours ago

I think it's fine to start with UFW on a desktop system at home to learn the very basics and get an idea on what ports you actually need. learning iptables/nftables is useful, but not necessary for a simple user at that level

[-] [email protected] 8 points 10 hours ago

if you want to learn about Linux firewalls, go for iptables instead.

I'd suggest learning nftables might be more fruitful nowadays.

this post was submitted on 27 Sep 2024

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