Currently trying to troubleshoot some things on the local network. All these Linux command line tools have kind of thrown me in the deep end. I’ve encountered ARP, DHCP, DNS, ports which are different from local IPs, Mac addresses, interfaces/devices that are for some reason different on different computers, packets, bridging, SSL, ICMP, NDP. TCP. The list goes on.
I need to take a step back—but where do I start? Are there any good books/resources where I can start from the beginning and learn about all of these things? I don’t need in-depth understanding—I think that will come with further research and playing around—but I do want to understand what I am playing with.
Edit: one question I would like to have answered by you guys: if I run this command on computer X
arping -I eth0 <computer A> And computer B is connected via Ethernet to computer X on computer X’s device eth0. When I run the command, it says
ARPING <computer A> from <computer B> eth0 But nothing is actually being produced. Does that mean that computer B can’t access computer A, or computer X can’t access computer B? What exactly is happening here?
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