I reset the interface with networksetup - this deleted the extra route sudo networksetup -setmanual Ethernet 10.17.124.78 255.255.255.0 the extra route is gone netstat -rnġ0.17.124. Your PCs IP address and your network Subnet Mask and Gateway will be listed. To the switch, a router is just another host on the LAN. On Mac On iOS On Android Find your router’s default gateway address When you are connected to the internet, your router (often called the default gateway) has an IP address. Switches don't understand layer-3 (except for layer-3 switches). Switches lean which MAC address is on which port simply by inspecting the source addresses on frames which come into the switch ports. I recently had an instance where someone setup dual default routes netstat -rnġ0.1.78.255 ff.ff.ff.ff.ff.ff UHLWbI bridge0 ! Switches don't use ARP to learn MAC addresses.
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