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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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

submitted 1 month ago by Cornflake_Dog@lemmy.wtf to c/linux@lemmy.ml

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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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[–] 0x0@programming.dev 9 points 1 month ago (2 children)

What can I do to see the intetnet traffic from individual apps

Wireshark

what I might want to block?

One strategy is to block everything, and open ports as needed. Beware that most guides focus on inbound traffic, whereas you seem to be focusing on outbound traffic.

[–] ReversalHatchery@beehaw.org 1 points 1 month ago (1 children)

wireshark does not work for individual apps, it cannot make a difference between traffic of process a and b.

[–] possiblylinux127@lemmy.zip 1 points 1 month ago* (last edited 1 month ago)

I'm not sure how Wireshark is related to firewalls honestly. It is mostly a layer 1 and 2 tool

[–] possiblylinux127@lemmy.zip 1 points 1 month ago

Why are we recommending Wireshark? That doesn't make any sense what so ever. If anything have them run a port scan with nmap.

This is crazy advise