manage from different subnet to int vlan1 in transparent mode

[janto]

Hi,
I had problem to manage the firewall setup in transparent mode from different subnet (PC2) than int vlan1.
topology :

L3 switch ---- trunk port (vlan 10 & 12) ----FW----trunk port (vlan 10 & 12) ----L2 switch----PC2 (vlan 10)

Vlan 12 on L2 switch and L3 switch configured as native vlan.
Int vlan1 IP address is in Vlan 12 subnet.

Please advice.
Thanks and Regards,
Janto