# This will create you three sepatate interfaces

robocfg switch disable
robocfg vlans enable reset
robocfg vlan 0 ports "0 5u"
robocfg vlan 1 ports "1 5t"
robocfg vlan 2 ports "2 3 4 5t"
robocfg switch enable

vconfig add eth0 1
vconfig add eth0 2

# eth0, eth0.1, eth0.2
# eth0 = WAN
# eth0.1 = LAN1
# eth0.2 = LAN2-3-4

ifconfig eth0 192.168.10.1
ifconfig eth0.1 192.168.11.1
ifconfig eth0.2 192.168.12.1