How can I ping point to point, or ethernet to ethernet when there is no IP address assigned? Is that possible? I tried using a MAC address with Ping but that did not work. In this case its a PC to a ethernet to 100BaseF (fiber) conversion and I want to send pings to test the link (no other routers or switches involved, just point to point). Any insight appreciated

You can't. You basically have no network if you have no ip's

you can't ping without an IP address. are you using this network to ping between PCs or access the internet. if you are only using it for testing you can assign a static IP address to each machine from the network configuration settings in the windows control panel, just right click and scroll down to TCP IP, then use a 192, 127, or 10 net address for your testing and a subnet mask of 255.255.255.0

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