My setup:
Head Office:
VPN LAN-to-LAN from 2 ISP, vpn0 and vpn1
Bridge the VPN to another eth for LAN connection, bridge0
Branch Office:
VPN LAN-to-LAN from 2 ISP, vpn0 and vpn1
Bonding 2 VPN to bond0 interface, load balancing
Bridge bond0 with another eth to provide LAN connection, bridge0
Http proxy and antivirus On
The connection in the bridge mode.
NA-811:
Processor: Intel Celeron 1GHz
Memory: 1 GB
CF: 4 GB
LAN: 4 10/100/1000Mbps Ethernet ports (Intel® 82573)
At the moment, QoS not yet set, but I will try to test with QoS for VOIP and Video Conference.