Hi Kumar,
not sure if I understand you correctly...lets see:
PVE server:
NIC1=vmbr0=192.168.178.22
NIC2=vmbr1=192.168.16.1
So all my traffic for my subnet goes through NIC2. Thats why the IP address of NIC2 is used as the gateway address for the external connection of the firewall. My router...