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A comment on Falsehoods Programmers Believe About LANs. Parent comment

Re:Falsehoods Programmers Believe About LANs by wmf on Saturday September 05, 2026 @07:23PM (#49581724)
There are recent "client isolation" features that prevent P2P communication. Some hosting providers also block customers on the same LAN from attacking each other.
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Re:Falsehoods Programmers Believe About LANs by jrockway on Saturday September 05, 2026 @07:25PM (#49581748)
Indeed. You might share a subnet with other customers of your ISP, but your ISP probably doesn't let you ARP poison them.

This isn't even that recent. I remember doing ARP poisoning exactly once and then being surprised that it didn't work everywhere.

I think the falsehood here is that same IPv4 subnet = same link layer network, but that doesn't have to be the case.

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Re:Falsehoods Programmers Believe About LANs by Hikikomori on Saturday September 05, 2026 @07:34PM (#49581827)
Did arp poisoning in school and used a tool to show images from websites people visited on the projector. Teacher thought it was fun until someone went to goatse.
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Re:Falsehoods Programmers Believe About LANs by jrockway on Saturday September 05, 2026 @07:24PM (#49581742)
Indeed. You might share a subnet with other customers of your ISP, but your ISP probably doesn't let you ARP poison them.

This isn't even that recent. I remember doing ARP poisoning exactly once and then being surprised that it didn't work everywhere.

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