system {
    host-name firewall-demo;
    time-zone GMT-6;
    authentication-order password;
    root-authentication {
        encrypted-password "asdkjas[98y34tbfp;hsdfo[ihas]goj"; ## SECRET-DATA
    }
    name-server {
        208.67.222.222;
        208.67.220.220;
    }
    services {
        ssh {
            protocol-version v2;
        }
        dhcp {
            pool 10.2.1.0/24 {
                address-range low 10.2.1.10 high 10.2.1.200;
                domain-name domain.com;
                name-server {
                    208.67.222.222;
                    208.67.220.220;
                }
                router {
                    10.2.1.1;
                }
            }
        }
    }
    syslog {
        user * {
            any emergency;
        }
        file messages {
            any any;
            authorization info;
        }
        file interactive-commands {
            interactive-commands any;
        }
        file allowed-traffic {
            any any;
            match RT_FLOW_SESSION_CREATE;
        }
        file blocked-traffic {
            any any;
            match RT_FLOW_SESSION_DENY;
        }
    }
    ntp {
        server 192.5.41.40 prefer;
        server 192.5.41.41;
    }
}
interfaces {
    ge-0/0/0 {
	description "Internal Interface";
        vlan-tagging;
        unit 10 {
            vlan-id 10;
            family inet {
                address 10.1.1.1/24;
            }
        }
        unit 20 {
            vlan-id 20;
            family inet {
                address 10.2.1.1/24;
            }
        }
        unit 30 {
            vlan-id 30;
            family inet {
                address 10.3.1.1/24;
            }
        }
    }
    ge-0/0/1 {
	description "External Interface";
        unit 0 {
            family inet {
                address 12.35.45.202/24; ##guessing on the subnet mask here
            }
        }
    }
}
routing-options {
    static {
        route 0.0.0.0/0 next-hop 12.35.45.1; ##guessing on the default gateway as well
    }
}
security {
    nat {
        source {
            rule-set outbound {
                from zone Trust;
                to zone Untrust;
                rule outbound-rule {
                    match {
                        source-address 10.0.0.0/8;
                    }
                    then {
                        source-nat {
                            interface;
                        }
                    }
                }
            }
        }
		destination {
            pool subversion {
                address 10.1.1.35/32;
            }
			pool web {
                address 10.1.1.36/32;
            }
			pool ftp {
                address 10.1.1.37/32;
            }
            rule-set inbound {
                from zone Untrust;
                rule subversion-nat {
                    match {
                        destination-address 12.35.45.202/32;
                        destination-port 22;
                    }
                    then {
                        destination-nat pool subversion;
                    }
                }
				rule web-nat {
                    match {
                        destination-address 12.35.45.202/32;
                        destination-port 80;
                    }
                    then {
                        destination-nat pool web;
                    }
                }
				rule ftp-nat {
                    match {
                        destination-address 12.35.45.202/32;
                        destination-port 21;
                    }
                    then {
                        destination-nat pool ftp;
                    }
                }
            }
        }

    }
    screen {
        ids-option Untrust_screen {
            icmp {
                ip-sweep threshold 1000;
                ping-death;
            }
            ip {
                source-route-option;
                tear-drop;
            }
            tcp {
                fin-no-ack;
                port-scan threshold 1000;
                /* Using default value for timeout since not within range 0-50 */
                syn-flood {
                    timeout 20;
                }
                land;
            }
        }
    }
    zones {
        security-zone Trust {
            tcp-rst;
            address-book {
                address subversion-server 10.1.1.35/32;
                address web-server 10.1.1.36/32;
				address ftp-server 10.1.1.37/32;
            }
            host-inbound-traffic {
                system-services {
                    all;
                }
                protocols {
                    all;
                }
            }
            interfaces {
                ge-0/0/0.10;
				ge-0/0/0.20;
				ge-0/0/0.30;
            }
        }
        security-zone Untrust {
            screen Untrust_screen;
            interfaces {
                ge-0/0/1.0 {
                    host-inbound-traffic {
                        system-services {
                            ping;
                            ike;
                        }
                    }
                }
            }
        }
    }
    policies {
        from-zone Untrust to-zone Trust {
            policy subversion {
                match {
                    source-address any;
                    destination-address subversion-server;
                    application junos-ssh;
                }
                then {
                    permit;
                    log {
                        session-close;
                    }
                }
            }
            policy ftp {
                match {
                    source-address any;
                    destination-address ftp-server;
                    application junos-ftp;
                }
                then {
                    permit;
                    log {
                        session-close;
                    }
                }
            }
			policy web {
                match {
                    source-address any;
                    destination-address web-server;
                    application junos-http;
                }
                then {
                    permit;
                    log {
                        session-close;
                    }
                }
            }
            policy default-deny {
                match {
                    source-address any;
                    destination-address any;
                    application any;
                }
                then {
                    deny;
                    log {
                        session-close;
                    }
                    count;
                }
            }
        }
		from-zone Trust to-zone Trust {
            policy permit-intra-trust {
                match {
                    source-address any;
                    destination-address any;
                    application any;
                }
                then {
                    permit;
                }
            }
        }
        from-zone Trust to-zone Untrust {
            policy permit-outbound {
                match {
                    source-address any;
                    destination-address any;
                    application any;
                }
                then {
                    permit;
                    log {
                        session-close;
                    }
                    count;
                }
            }
        }
    }
    flow {
        tcp-session {
            strict-syn-check;
        }
    }
}