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ping -b 192.168.1.255(which doesn't require ARP) once you allow answering broadcasts (sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=0) in peers . Also togglingap_isolatelike told in the answer might change behaviour (but answer talks about a non-existing bridge). multicast (and broadcast) can be handled differently than unicast sometimes in Wifi (related to shared group key etc.)ping -bis working ificmp_echo_ignore_broadcasts=0.