I have a headless mini computer with an Ethernet port, a Mac with a USB (not C) port, and a USB to Ethernet adaptor.
The mini computer is running standard CentOS Linux, and the eth interface is set to DHCP. The moment I connect the mini computer to a router via an Ethernet cable, it has access to the internet without any configuration.
The USB to Ethernet adaptor for my mac is also functional. I can connect it directly to the router and access the internet without configuration.
I would like to SSH into my mini computer over Ethernet, without needing the screen and keyboard, nor the intermediate router. However, I'm not getting any connectivity.
Do I need a cross-over Ethernet cable?
I know this is a very broad and ambigous question, but any pointers to what I could learn or investigate more about would be helpful.