Dear,
I have WAN 1 (203.176.130.18/30) as IP Forwarding mode and LAN (VLAN 801: 203.176.142.129/27)
So Can I use IP in Vlan 801 to be WAN2 as NAT mode ?
WAN2 network needs to be unique from VLAN 801 on the LAN as you are doing a NAT from LAN/WAN networks.