set vlans v100-INTERNAL1 vlan-id 100
set vlans v101-INTERNAL2 vlan-id 101
set vlans v102-EXTERNAL vlan-id 102

set interfaces fe-0/0/0 unit 0 family ethernet-switching vlan-members v100-INTERNAL1
set interfaces fe-0/0/1 unit 0 family ethernet-switching vlan-members v101-INTERNAL2
set interfaces fe-0/0/2 unit 0 family ethernet-switching vlan-members v102-EXTERNAL

set interfaces vlan unit 100 family inet address 192.168.100.1/24
set interfaces vlan unit 101 family inet address 192.168.101.1/24
set interfaces vlan unit 102 family inet address 192.168.102.1/24

set vlans v100-INTERNAL1 l3-interface vlan.100
set vlans v101-INTERNAL2 l3-interface vlan.101
set vlans v102-EXTERNAL l3-interface vlan.102

set routing-options static route 0.0.0.0/0 next-hop 192.168.102.254

set security zones security-zone INTERNAL host-inbound-traffic system-services all
set security zones security-zone EXTERNAL host-inbound-traffic ping

set security zones security-zone EXTERNAL interfaces vlan.102
set security zones security-zone INTERNAL interfaces vlan.100
set security zones security-zone INTERNAL interfaces vlan.101

set security policies from-zone INTERNAL to-zone EXTERNAL policy PERMIT-OUTBOUND match source-address any destination-address any application any
set security policies from-zone INTERNAL to-zone EXTERNAL policy PERMIT-OUTBOUND then permit
set security policies from-zone INTERNAL to-zone INTERNAL policy PERMIT-INTERNAL match source-address any destination-address any application any
set security policies from-zone INTERNAL to-zone INTERNAL policy PERMIT-INTERNAL then permit