Archived
Tested live: AP isolation was already off on the TP-Link BE9300, and a second wireless device (phone) failed identically to the laptop - rules out isolation entirely. Real cause is the router's 4addr/WDS handling not forwarding wireless-client broadcast/ARP traffic to pve-test's WDS association, even though wired forwarding to it works fine. Since ARP never resolves for wireless peers, this affects every protocol (web UI included), not just ICMP - corrects an earlier draft of this doc that speculated TCP might still work.