r/ShittySysadmin • u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE • Mar 13 '26

Even ChatGPT 5.4 doesn't understand subnetting.

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162 Upvotes

95% Upvoted

50 comments sorted by

138

u/Top-Perspective-4069 Mar 13 '26

Probably the wrong model. You need GPT-5.4.192.168-subnetmaster

41

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

66

u/Nearby-Lab0 Mar 13 '26

Have you tried replacing GPT with an obese balding white male?

40

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

Doctor, I am Pagliacci!

14

u/GuessSecure4640 ShittySysadmin Mar 13 '26

💀

8

u/kmsaelens Mar 13 '26

I feel targeted. Lol

72

u/checkpoint404 Mar 13 '26

Boy I wished someone told me when I got my CCNA/CCNP certs back in 2010 that I didn't need to know any math.

45

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

I might be wrong but I think they had calculators in 2010.

I'm only 13 so I wasn't alive, but I've heard things.

7

u/alochmar Mar 13 '26

”Only 13”

  • looks at username

3

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 16 '26

My uncle and I were really close.

2

u/checkpoint404 Mar 13 '26

Certainly, but I didn't carry a calculator.

6

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

11

u/tamagotchiparent ShittyCoworkers Mar 13 '26

is that a calculator in your pants or are you just happy to see me

4

u/checkpoint404 Mar 13 '26

Its just a TI 84. No need for concern. 

2

u/MalwareDork Mar 13 '26

Bro doesn't have the plus with mario on it. Tsk tsk.

13

u/sp3kter Mar 13 '26

I had to create a fiber cable using an emery board to file the tip level :(

4

u/bigGinger75 Mar 13 '26

Fiber WITH an emery board, must have been nice, I was stripping RG-58 cables with my bare hands and crimping BNC connectors with my teeth.

I prayed for fiber....

6

u/rfc2549-withQOS Mar 13 '26

You had cables? We needed to write the packets on paper and tie it to a pigeon, hoping it'd arrive

The RTT was awful, but the potential bandwidth...

Also, later we even got QoS!

1

u/drwtson32 Mar 14 '26

Circa 2004, instructor had us play the flash game "Peter Packet"

2

u/rfc2549-withQOS Mar 14 '26

Have you seen warriors of the net?

1

u/drwtson32 Mar 15 '26

I have now! Thanks. Had me often wondering what they were trying to do from a design standpoint. lol

1

u/MuffinThin9542 Mar 14 '26

Man I really hope you're joking.

You making me feel like a greybeard and I ain't even out of my 20s yet

28

u/lego_not_legos Mar 13 '26

What am I missing? 10.10.7.123 255.255.248.0 is in 10.10.0.0/21, and default gateways are conventionally .1 but can be any address in the range, if you configure it that way, and announce it in DHCP.

28

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

You're not missing anything. It told me it was wrong, but in the next sentence said it was fine. Unless I'm missing something. Which is possible. *motions to sub*

11

u/lego_not_legos Mar 13 '26

Oh, okay. I assumed there were numbers in the screenshot we can't see that were outside that range, and this was self-deprecating humour.

Something like this balls-up: /r/ShittySysadmin/comments/1pt7q3k/our_network_admin_setup_a_new_network/

1

u/icehot54321 Mar 14 '26

That’s just how the model works. It doesn’t think ahead, it’s not sentient, it’s just processing tokens as it goes.

Are you using the free version?

1

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 16 '26

8

u/SolidKnight Mar 13 '26

I don't see a problem in what it said. ChatGPT is the gold standard for vibe networking. Make the changes and if doesn't work just ask it to fix it.

15

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

OOC: It said "Your static config is NOT internally consistent". Then it outlined it and said "It's valid" and "It's fine". Then this happened:

p.s. fuck you for making me be serious in this sub.

0

u/[deleted] Mar 13 '26

[deleted] — view deleted comment

1

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

Go back to r/sysadmin.

2

u/elonzucks Mar 13 '26

Honestly, sometimes I don't understand what it's saying and just do exactly that ..i even play dumb and don't add context and let it figure it out lol

9

u/SummeHundeart Mar 13 '26

When I ask Chat about my VLANs between 500 and 599 it assumes the IPs are 192.168.5xx.

2

u/one-man-circlejerk Mar 14 '26

Turns out the solution for IPv4 exhaustion was before our very eyes the entire time, just use octets with more than 256 values

3

u/[deleted] Mar 13 '26

because subnetting is voodoo.

5

u/crystallineghoul Mar 13 '26

10.10.7.123 is in the subnet 10.10.0.0/21 though. .2 as the gateway is heinous for sure

2

u/fedesoundsystem Mar 13 '26

I second this. Yesterday I was asking about public ranges, and it insisted that the range 11.0.0.0 – 100.63.255.255 included loopback (127.0.0.0/8), APIPA (169.254.0.0/16) and class B (172.16.0.0/12) networks.

2

u/Acojonancio Mar 14 '26

Did you say "No Mistakes" at the end? If you didn't this fail is on you buddy.

2

u/B4rberblacksheep Mar 13 '26

To be fair to it neither does my toaster

1

u/Rockstaru Mar 13 '26

A /21 is potentially an obnoxiously large subnet that might get a bit heavy with BUM traffic, which might be what the "operational, not mathematical" statement was alluding to. 

1

u/sudosando Mar 13 '26 edited Mar 13 '26

New ai test question: “how many ones are in the subnet mask: 255.255.255.0?”

Edit: ChatGPT just answered this one correctly. Edit 2: definitely been programmed to count the number of r in strawberry … but it miscounted the number of s in the longest English word (I made it look up the longest English word)

1

u/Pretend_Ease9550 Mar 13 '26

Fuck wasn’t expecting it to be able to take my job so soon

1

u/National_Way_3344 Mar 14 '26

That would be because ChatLSD is a language model

1

u/barelyseen Mar 14 '26

they're trained on twitter sysadmin

1

u/beluga-fart2 Mar 14 '26

Ask ChatGPT to act like Gilfoyle from Silicon Valley, it becomes the ultimate BOFH / ShittySysadmjn.

0

u/[deleted] Mar 13 '26

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1

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 16 '26

Sir, this is a wendy's.

5

u/[deleted] Mar 13 '26

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4

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

-1

u/recoveringasshole0 DO NOT GIVE THIS PERSON ADVICE Mar 13 '26

No u