I have read "you cannot configure two vlans with the same IP address range".
Why not? I thought the whole idea of vlans was to effectively implement two networks on one switch, by the addition of tags containing a vlan id?
So why can't I have red 192.168.0.0/24 on vlan 10 and blue 192.168.0.0/24 on vlan 20?
I know there's a good reason, but I can't figure it out at the moment.