Thanks to the precious help of the zrouter.org teamI succeeded in installing OPNSense on NetASQ U70. The internal switch is connected to the secondary RS232 port of the board.So, consider the following procedure :Define 2 VLAN at startup : VLAN 1 et VLAN 2 both on em0 interface then,Assign em0_vlan1 to WANAssign em0_vlan2 to LANThe switch configuration hereafter has to be respected to obtain :port 1 = WANport 2 to 6 = LANConfiguration of switch NetASQ_U70 :cu -s 9600 -l /dev/ttyu1> vlanVLAN> aware 1 enableVLAN> pvid 1 noneVLAN> frame type 1 TaggedVLAN> aware 2-8 disableVLAN> pvid 2 1VLAN> pvid 3-8 2VLAN> del 1-4094VLAN> add 1 1-2VLAN> add 2 1,3-8VLAN> configVLAN Configuration: Port Aware PVID Ingress Filtering Frame Type 1: enabled none disabled Tagged 2: disabled 1 disabled All 3: disabled 2 disabled All 4: disabled 2 disabled All 5: disabled 2 disabled All 6: disabled 2 disabled All 7: disabled 2 disabled All 8: disabled 2 disabled All Entries in permanent table: 1: 1,2 2: 1,3,4,5,6,7,8VLAN>Use the cu(1) escape sequence <Enter> then ~ (tilde) followed by . (dot)For further reading on the switch CLI : https://www.szafa-rackowa.pl/zalacznik/Instrukcja-obslugi-Lantech-LGS-2424C-1200.pdfHave fun.