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Exactly, if your two computer are in different VLAN, you can't ping one to another even if your two computer are on the same subnet.Verify if Your two PC are on the same VLAN.
It's normal you ping the PC, because the two PC are in the same VLAN and same Subnet.But it is impossible to have differents VLAN in the Same Subnet, because VLAN is virtuel network, so network