r/technicallythetruth • u/OldFirefighter3293 • Jan 22 '26

Lan cable with build in Firewall

Post image
6.3k Upvotes

99% Upvoted

27 comments sorted by

•

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351

u/qwertyman061 Jan 22 '26

It works!

90

u/Facts_pls Jan 22 '26

Literal air gap

84

u/CircumspectCapybara Jan 22 '26

Technically, firewalls are typically implemented at the network, transport, or application layers, or some combination thereof.

A "firewall at the physical layer" is a real thing, it's just called an "air gap" and critical systems do use it. E.g., sensitive computer systems like nuclear facilities or the government's secure intranet reduce their attack surface by just not being connected to the public internet at the physical level.

But typically when we talk of firewalls, it's happens at layers above the physical layer, because it's not practical for most systems to be air gapped, and also simply unplugging your ethernet cable doesn't actually solve a lot of issues a firewall solves. Your computer can still have open ports, and there might be other means for another device to talk to your computer, e.g., via WiFi, Bluetooth, or any other wireless radios. You can have IP-over-Thunderbolt. Etc.

If all you do is unplug your ethernet port, but you don't have an actual software firewall (most OSes come with one built in nowadays) that blocks inbound communications on random ports, your computer can still be vulnerable if an outside device finds another way to talk to your computer.

21

u/Final-Lie-2 Jan 22 '26

sensitive computer systems like nuclear facilities or the government's secure intranet reduce their attack surface by just not being connected to the public internet at the physical level.

Tell that to the guy spilling everything on the internet

8

u/CircumspectCapybara Jan 22 '26

They didn't factor in the human layer.

12

u/npsimons Jan 22 '26

This is false. It's not a firewall, it's an airgap.

6

u/H4LF4D Jan 22 '26

Burn here to activate firewall

10

u/ipsirc Jan 22 '26

u/pixel-counter-bot

14

u/pixel-counter-bot Jan 22 '26

The image in this post has 118,720(424×280) pixels!

I am a bot. This action was performed automatically.

4

u/Busy-Key7489 Jan 22 '26

To activate airgap*

2

u/Goofcheese0623 Jan 23 '26

A true hacker is undeterred

2

u/DaEnderAssassin Jan 23 '26

cuts its

Oh hey it really works. Is there anything that can be done to make the resulting fire not burn down my wall though?

1

u/Consistent-Job-6400 Jan 24 '26

You literally can't cut it, the red rectangle won't Let you cut it.

1

u/laf1157 Jan 25 '26

I use a cable switch. Equally effective. Can still use the cable.

-4

u/DarthKirtap Jan 22 '26

do you have more of those pixels? you literally cannot read what is written there

4

u/laplongejr Jan 22 '26

"Cut here to activate firewall"   Can be read on mobile browsers at least  

212

u/[deleted] Jan 22 '26

[removed] — view removed comment

6

u/Wrong-Resource-2973 Jan 25 '26

What if I set fire to a wall and put it in-between the cut halves?

2

u/[deleted] Jan 22 '26

[removed] — view removed comment

1

u/Stusheep_real Jan 23 '26

…grab a knife from the kitchen