this post was submitted on 25 Jul 2025
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This reminded me of an anecdote from maybe 6 years ago. I was setting up and testing a small network and a couple devices to install for a customer, let's say the subnet was 192.168.2.0/24.
Weird things were happening, I was being lazy and wasn't directly connected to the network, may have setup a VPN between devices somewhere; can't really remember. But pings would sometimes drop or blow out to 100's ms.
I eventually ended up disconnecting that network entirely, then the pings continued and got more stable?? WTF! I need we didn't have that subnet in use, even checked before setting it up. In the time between checking and the issues happening, someone in Sydney somewhere had stuffed up on their router and exposed there LAN to the internet without any Firewalls, just available.
Scanned and found all the IPs in use and in them found a printer. Connected to it and printed a page saying I'm from company XYZ and found all these devices available, and to either contact their IT and resolve it ASAP or my company to help. About an hour later it seemed to be resolved.
It was an interesting day.
Uh... you can't just "expose a LAN network to the Internet" in this manner. Local subnets aren't routable over the Internet, so you can't just enter 192.168.2.3 and end up on somebody else's private LAN.
https://www.geeksforgeeks.org/computer-networks/non-routable-address-space/
They would have needed to either have all their internal devices being assigned public IP's or had NAT+firewall rules explicitly routing ports from their outside address(es) to the inside ones. The former is unlikely as normally ISPs don't allocate that many to a given client, or at least not by DHCP. the latter would require a specific configuration mapping the outside addresses/ports to inside devices, likely on a per device+port basis.
Either your story is missing key details or you've misunderstood/made-up something.
They did indicate that the subnet they provided in the example was not the actual one they used.