security {
    log {
        mode stream;
        report;
        source-interface ge-0/0/1.0;
    }
    nat {
        source {
            rule-set interface-nat {
                from zone trust;
                to zone untrust;
                rule rule1 {
                    match {
                        source-address 0.0.0.0/0;
                        destination-address 0.0.0.0/0;
                    }
                    then {
                        source-nat {
                            interface;
                        }
                    }
                }
            }
        }
    }
    policies {
        from-zone trust to-zone untrust {
            policy Allow_Internet {
                match {
                    source-address any;
                    destination-address any;
                    application [ junos-http junos-http-ext junos-https ];
                }
                then {
                    permit;
                    log {
                        session-init;
                        session-close;
                    }
                }
            }
        }
        default-policy {
            deny-all;
        }
    }
    zones {
        security-zone untrust {
            interfaces {
                ge-0/0/0.0;
            }
        }
        security-zone trust {
            interfaces {
                ge-0/0/1.0 {
                    host-inbound-traffic {
                        system-services {
                            all;
                        }
                        protocols {
                            all;
                        }
                    }
                }
                ge-0/0/1.10 {
                    host-inbound-traffic {
                        system-services {
                            all;
                        }
                        protocols {
                            all;
                        }
                    }
                }
                ge-0/0/1.20 {
                    host-inbound-traffic {
                        system-services {
                            all;
                        }
                        protocols {
                            all;
                        }
                    }
                }
				ge-0/0/1.30 {
                    host-inbound-traffic {
                        system-services {
                            all;
                        }
                        protocols {
                            all;
                        }
                    }
                }
            }
        }
    }
}
interfaces {
    ge-0/0/0 {
        unit 0 {
            family inet {
                address 192.168.250.5/24;
            }
        }
    }
    ge-0/0/1 {
        vlan-tagging;
        unit 0 {
            vlan-id 1;
            family inet {
                address 172.16.0.1/24;
            }
        }
        unit 10 {
            vlan-id 10;
            family inet {
                address 172.16.10.254/24;
            }
        }
        unit 20 {
            vlan-id 20;
            family inet {
                address 172.16.20.254/24;
            }
        }
        unit 30 {
            vlan-id 30;
            family inet {
                address 172.16.30.254/24;
            }
        }
    }
    ge-0/0/2 {
        disable;
    }
    ge-0/0/3 {
        disable;
    }
    ge-0/0/4 {
        disable;
    }
    ge-0/0/5 {
        disable;
    }
    ge-0/0/6 {
        disable;
    }
    ge-0/0/7 {
        disable;
    }
}
routing-options {
    static {
        route 0.0.0.0/0 next-hop 192.168.250.2;
		route 172.16.10.0/24 next-hop 172.16.10.254;
        route 172.16.20.0/24 next-hop 172.16.20.254;
        route 172.16.30.0/24 next-hop 172.16.30.254;
    }
}

[edit]