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    That doesn't make any sense and isn't how TCP/IP communications work... Can elaborate on the connectivity of the Linux and MacOS machines? What is the subnet(s) and IP addresses involved here?
    – acejavelin
    Commented Jun 24, 2023 at 2:51
  • Basic home network. Dlink router, 192.168.0.x ip addresses, 255.255.255.0 subnet assigned by DHCP. A Dell Windows 10 PC using a Wifi usb adapter. A Mac Mini running 10.15 and a Chromebook can't ping the Dell. If I connect the Dell wired to the router there is no problem.
    – venatorgh
    Commented Jun 24, 2023 at 4:27
  • (1) Are all computers connected to the router by wifi? (2) What are the IP addresses of Mac & LInux? (3) Does the router have any kind of isolation settings? (Add to your comment @harrymc for me to be notified.)
    – harrymc
    Commented Jun 24, 2023 at 8:00
  • @harrymc 1. All PC's are connected to the network by wifi. IP addresses are all in the 192.168.0.x range, for example 192.168.0.123 dell, 192.168.0.143 chromebook. It is a Dlink commercial router from Best Buy so not many user controls but I don't see anything that should be blocking wifi traffic.
    – venatorgh
    Commented Jun 24, 2023 at 14:24
  • Do Linux/Mac even see the Windows computer in the network? If the router has a screen for all attached devices, is it showing the Windows computer differently than Linux/Mac?
    – harrymc
    Commented Jun 24, 2023 at 14:43