I have two computers: PC1 and PC2. PC1 has an IP address of 10.0.0.1/30, and PC2 has an IP address of 10.0.0.6/30. They are connected directly to each other with a crossover cable. My understanding is that they should not be able to ping each other, but I just tested it, and they can both ping each other. Have I misunderstood something about how subnets work?
EDIT: I can change the IP addresses and subnet masks to anything I want, and they can still ping.