I first thought that vlans aren’t supposed to ping each other. But i saw topics that people wanted that the vlans could ping each other. I'm so confused right now. Can somebody explain which is the most average? en why..   

Hi :)   I'm new to this and i'm trying to build a vlan network based on the router on a stick principle. When i first created the vlans and stuff it worked.. and i could'nt ping from vlan 10 to vlan 20. But when i added nat overload to vlan 10 and 20...