적수네 동네 - 1원짜리 팁?

	>> Read No. 3165 article
마스커레이딩시 iptables 스크립트......
등록 2002-12-18 14:26:00 조회 6
이름 Wizard
		필요하신분이 있을거 같아서 올립니다.
적절히 수정하셔서 사용하십시오.
 [wizard@linux wizard]$ vi /etc/rc.d/init.d/iptables
 #!/bin/sh
# Invoked from /etc/rc.d/init.d/iptables.
# chkconfig: - 60 95
# description: Starts and stops the IPTABLES packet filter
#              used to provide firewall network services.
 # Source function library.
. /etc/rc.d/init.d/functions
 # Source networking configuration.
. /etc/sysconfig/network
 # Check that networking is up.
if [ ${NETWORKING} = "no" ]
then
        exit 0
fi
 if [ ! -x /sbin/iptables ]; then
    exit 0
fi
 # See how we were called.
case "$1" in
  start)
        echo -n "Starting Firewalling:"
 # ----------------------------------------------------------------------------
#  Some definitions for easy maintenance.
#  EDIT THESE TO SUIT YOUR SYSTEM AND ISP.
 IPADDR=`ifconfig eth0 | fgrep -i inet | cut -d : -f 2 | cut -d   -f 1`
EXTERNAL_INTERFACE="eth0"                       # Internet connected interface
LOOPBACK_INTERFACE="lo"                         # Your local naming convention
LOCAL_INTERFACE_1="eth1"                        # Your Internal LAN interface
INTRANET="***.**.**.*/24"                     	# Your Private IP Addr Range
PRIMARY_NAMESERVER="***.**.**.*"                # Your Primary Name Server
#SECONDARY_NAMESERVER="***.**.**.*"              # Your Secondary Name Server
#SYSLOG_SERVER="***.**.**.*"   		        # Your Syslog Internal Server
 LOOPBACK="127..0/8"                          # Reserved loopback address range
CLASS_A="10..0/8"                            # Class A private networks
CLASS_B="172.16./12"                         # Class B private networks
CLASS_C="192.168./16"                        # Class C private networks
CLASS_D_MULTICAST="224..0/4"                 # Class D multicast addr
CLASS_E_RESERVED_NET="240..0/5"              # Class E reserved addr
BROADCAST_SRC=".0.0"                         # Broadcast source addr
BROADCAST_DEST="255.255.255.255"                # Broadcast destination addr
PRIVPORTS="0:1023"                              # Privileged port range
UNPRIVPORTS="1024:"                             # Unprivileged port range
 # ----------------------------------------------------------------------------
 # The SSH client starts at 1023 and works down to 513 for each
# additional simultaneous connection originating from a privileged port.
# Clients can optionally be configured to use only unprivileged ports.
SSH_LOCAL_PORTS="1022:65535"                    # Port range for local clients
SSH_REMOTE_PORTS="513:65535"                    # Port range for remote clients
 # traceroute usually uses -S 32769:65535 -D 33434:33523
TRACEROUTE_SRC_PORTS="32769:65535"
TRACEROUTE_DEST_PORTS="33434:33523"
 # ----------------------------------------------------------------------------
 # FIREWALL MODULES
# ----------------
     # Uncomment all of the following modules lines only
    # for modularized kernel system.
     # These modules are necessary to masquerade their respective services.
#    /sbin/modprobe ip_tables
#    /sbin/modprobe iptable_nat
#    /sbin/modprobe ip_conntrack
#    /sbin/modprobe ip_conntrack_ftp
#    /sbin/modprobe ip_tables
#    /sbin/modprobe ip_nat_ftp
#    /sbin/modprobe ipt_LOG
#    /sbin/modprobe ipt_MARK
#    /sbin/modprobe ipt_MASQUERADE
#    /sbin/modprobe ipt_REDIRECT
#    /sbin/modprobe ipt_REJECT
#    /sbin/modprobe ipt_TOS
#    /sbin/modprobe ipt_limit
#    /sbin/modprobe ipt_mac
#    /sbin/modprobe ipt_mark
#    /sbin/modprobe ipt_multiport
#    /sbin/modprobe ipt_state
#    /sbin/modprobe ipt_tos
#    /sbin/modprobe iptable_mangle
 # ----------------------------------------------------------------------------
 # Default policy is DENY
# Explicitly accept desired INCOMING & OUTGOING connections
     # Remove all existing rules belonging to this filter
    iptables -F
    iptables -F -t nat
     # Remove any existing user-defined chains.
    iptables -X
     # Set the default policy of the filter to deny.
    iptables -P INPUT   DROP
    iptables -P OUTPUT  DROP
    iptables -P FORWARD DROP
 # ----------------------------------------------------------------------------
 # LOOPBACK
# --------
     # Unlimited traffic on the loopback interface.
     iptables -A INPUT  -i $LOOPBACK_INTERFACE  -j ACCEPT
    iptables -A OUTPUT -o $LOOPBACK_INTERFACE  -j ACCEPT
 # ----------------------------------------------------------------------------
 # Unlimited traffic within the local network.
     # All internal machines have access to the fireall machine.
     iptables -A INPUT  -i $LOCAL_INTERFACE_1 -s $INTRANET -j ACCEPT
    iptables -A OUTPUT -o $LOCAL_INTERFACE_1 -d $INTRANET -j ACCEPT
 # ----------------------------------------------------------------------------
 # STATEFUL PART!
# --------------
     # Kill malformed XMAS packets
    iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
    iptables -A FORWARD -p tcp --tcp-flags ALL ALL -j DROP
     # Kill malformed NULL packets
    iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
    iptables -A FORWARD -p tcp --tcp-flags ALL NONE -j DROP
     # Block faked, or "spoofed," packets from getting through the firewall.
    iptables -A FORWARD -i $LOCAL_INTERFACE_1 -s ! $INTRANET -j DROP
     # Allow all internal packets out of our network.
    iptables -A FORWARD -m state --state NEW -i $LOCAL_INTERFACE_1
             -s $INTRANET -j ACCEPT
     # Allow the associated packets with those connections back in.
    iptables -A FORWARD -m state --state ESTABLISHED,RELATED
             -i $EXTERNAL_INTERFACE -s ! $INTRANET -j ACCEPT
     # All internal traffic is masqueraded externally.
    iptables -A POSTROUTING -t nat -o $EXTERNAL_INTERFACE -j MASQUERADE
 # Blocks any forwards that come from Internet connection. Uncomment only for
# users with modem device like "ppp0".
 #    iptables -A FORWARD -i $EXTERNAL_INTERFACE -m state
#    --state NEW,INVALID -j REJECT
 # ----------------------------------------------------------------------------
 # Network Ghouls
     # Deny access to jerks
    # --------------------
    # /etc/rc.d/rc.firewall.blocked contains a list of
    # iptables -A INPUT -i $EXTERNAL_INTERFACE -s address -j DROP
    # rules to block from any access.
     # Refuse any connection from problem sites
    if [ -f /etc/rc.d/rc.firewall.blocked ]; then
    deny_file="/etc/rc.d/rc.firewall.blocked"
    temp_file="/tmp/temp.ip.addresses"
    cat $deny_file | sed -n -e "s/^[ ]*([0-9.]*).*$/1/p"
    | awk ' $1 ' > $temp_file
    while read ip_addy
    do
      case $ip_addy in
        *) iptables -A INPUT -i $EXTERNAL_INTERFACE -s $ip_addy -j DROP
           iptables -A INPUT -i $EXTERNAL_INTERFACE -d $ip_addy -j DROP
           iptables -A OUTPUT -o $EXTERNAL_INTERFACE -s $ip_addy -j REJECT
           iptables -A OUTPUT -o $EXTERNAL_INTERFACE -d $ip_addy -j REJECT
        ;;
     esac
    done < $temp_file
    rm -f $temp_file > /dev/null 2>&1
    unset temp_file
    unset deny_file
    fi
 # ----------------------------------------------------------------------------
 # SPOOFING & BAD ADDRESSES
# Refuse spoofed packets.
# Ignore blatantly illegal source addresses.
# Protect yourself from sending to bad addresses.
     # Refuse incoming packets pretending to be from the external address.
    iptables -A INPUT   -s $IPADDR -j DROP
     # Refuse incoming packets claiming to be from a Class A, B or C private network
    iptables -A INPUT   -s $CLASS_A -j DROP
    iptables -A INPUT   -s $CLASS_B -j DROP
#    iptables -A INPUT   -s $CLASS_C -j DROP
     # Refuse broadcast address SOURCE packets
    iptables -A INPUT   -s $BROADCAST_DEST -j DROP
    iptables -A INPUT   -d $BROADCAST_SRC -j DROP
     # Refuse Class D multicast addresses
    # Multicast is illegal as a source address.
    # Multicast uses UDP.
    iptables -A INPUT   -s $CLASS_D_MULTICAST -j DROP
     # Refuse Class E reserved IP  addresses
    iptables -A INPUT   -s $CLASS_E_RESERVED_NET -j DROP
     # Refuse special addresses defined as reserved by the IANA.
    # Note:  The remaining reserved addresses are not included
    # filtering them causes problems as reserved blocks are
    # being allocated more often now. The following are based on
    # reservations as listed by IANA as of 2001/01/04. Please regularly
    # check at http://www.iana.org/ for the latest status.
     # Note:  this list includes the loopback, multicast, & reserved addresses.
     # 0.*.*.*                   - Can't be blocked for DHCP users.
    # 127.*.*.*                 - LoopBack
    # 169.254.*.*               - Link Local Networks
    # 192.0.2.*                 - TEST-NET
    # 224-255.*.*.*             - Classes D & E, plus unallocated.
     iptables -A INPUT   -s .0.0/8 -j DROP
    iptables -A INPUT   -s 127..0/8 -j DROP
    iptables -A INPUT   -s 169.254./16 -j DROP
    iptables -A INPUT   -s 192.0.2.0/24 -j DROP
    iptables -A INPUT   -s 224..0/3 -j DROP
 # ----------------------------------------------------------------------------
     # UDP TRACEROUTE
    # --------------
     # traceroute usually uses -S 32769:65535 -D 33434:33523
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             --source-port $TRACEROUTE_SRC_PORTS
             -d $IPADDR --destination-port $TRACEROUTE_DEST_PORTS -j DROP
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p udp 
             -s $IPADDR --source-port $TRACEROUTE_SRC_PORTS
             --destination-port $TRACEROUTE_DEST_PORTS -j ACCEPT
 # ----------------------------------------------------------------------------
     # DNS forward-only nameserver
    # ---------------------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             -s $PRIMARY_NAMESERVER --source-port 53
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p udp 
             -s $IPADDR --source-port $UNPRIVPORTS
             -d $PRIMARY_NAMESERVER --destination-port 53 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             -s $PRIMARY_NAMESERVER --source-port 53
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             -d $PRIMARY_NAMESERVER --destination-port 53 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             -s $SECONDARY_NAMESERVER --source-port 53
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p udp 
             -s $IPADDR --source-port $UNPRIVPORTS
             -d $SECONDARY_NAMESERVER --destination-port 53 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             -s $SECONDARY_NAMESERVER --source-port 53
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             -d $SECONDARY_NAMESERVER --destination-port 53 -j ACCEPT
     # ------------------------------------------------------------------
     # HTTP client (80)
    # ----------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 80
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 80 -j ACCEPT
     # ------------------------------------------------------------------
     # HTTPS client (443)
    # ------------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 443
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 443 -j ACCEPT
     # ------------------------------------------------------------------
     # WWW-CACHE client
    # ----------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#             --source-port 3128
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 3128 -j ACCEPT
     # ------------------------------------------------------------------
     # NNTP NEWS client (119)
    # ----------------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 119
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 119 -j ACCEPT
     # ------------------------------------------------------------------
     # POP client (110)
    # ----------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 110
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 110 -j ACCEPT
     # ------------------------------------------------------------------
     # IMAP client (143)
    # -----------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#             --source-port 143
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 143 -j ACCEPT
     # ------------------------------------------------------------------
     # SMTP client (25)
    # ----------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 25
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 25 -j ACCEPT
     # ------------------------------------------------------------------
     # SSH server (22)
    # ---------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp 
             --source-port $SSH_REMOTE_PORTS
             -d $IPADDR --destination-port 22 -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp ! --syn
             -s $IPADDR --source-port 22
             --destination-port $SSH_REMOTE_PORTS -j ACCEPT
      # SSH client (22)
    # ---------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 22
             -d $IPADDR --destination-port $SSH_LOCAL_PORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $SSH_LOCAL_PORTS
             --destination-port 22 -j ACCEPT
     # ------------------------------------------------------------------
     # TELNET client (23)
    # ------------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#            --source-port 23
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 23 -j ACCEPT
     # ------------------------------------------------------------------
     # AUTH server (113)
    # -----------------
     # Reject, rather than deny, the incoming auth port. (NET-3-HOWTO)
    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp 
             --source-port $UNPRIVPORTS
             -d $IPADDR --destination-port 113 -j REJECT
      # AUTH client (113)
    # -----------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#             --source-port 113
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 113 -j ACCEPT
     # ------------------------------------------------------------------
     # WHOIS client (43)
    # -----------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#             --source-port 43
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 43 -j ACCEPT
     # ------------------------------------------------------------------
     # FINGER client (79)
    # ------------------
 #    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
#             --source-port 79
#             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
 #    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
#             -s $IPADDR --source-port $UNPRIVPORTS
#             --destination-port 79 -j ACCEPT
     # ------------------------------------------------------------------
     # FTP client (21)
    # ---------------
     # outgoing request
    iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 21 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 21
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
      # PORT mode data channel
    iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp 
             --source-port 20
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp ! --syn
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 20 -j ACCEPT
     # ------------------------------------------------------------------
     # IRC client (6667)
    # -----------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 6667
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 6667 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp 
             --source-port $UNPRIVPORTS
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port $UNPRIVPORTS -j ACCEPT
     # ------------------------------------------------------------------
     # RealAudio / QuickTime client
    # ----------------------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 554
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 554 -j ACCEPT
      # TCP is a more secure method:  7070:7071
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 7070:7071
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 7070:7071 -j ACCEPT
      # UDP is the preferred method:  6970:6999
    # For LAN machines, UDP requires the RealAudio masquerading module and
    # the ipmasqadm third-party software.
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             --source-port $UNPRIVPORTS
             -d $IPADDR --destination-port 6970:6999 -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p udp 
             -s $IPADDR --source-port 6970:6999
             --destination-port $UNPRIVPORTS -j ACCEPT
     # ------------------------------------------------------------------
     # ICQ client (4000)
    # -----------------
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp ! --syn
             --source-port 2000:4000
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p tcp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 2000:4000 -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             --source-port 4000
             -d $IPADDR --destination-port $UNPRIVPORTS -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p udp 
             -s $IPADDR --source-port $UNPRIVPORTS
             --destination-port 4000 -j ACCEPT
     # ------------------------------------------------------------------
     # SYSLOG client (514)
    # -------------------
 #    iptables -A OUTPUT  -o $EXTERNAL_INTERFACE -p udp
#             -s $IPADDR --source-port 514
#             -d $SYSLOG_SERVER --destination-port $UNPRIVPORTS -j ACCEPT
 # ----------------------------------------------------------------------------
 # ICMP
     #    To prevent denial of service attacks based on ICMP bombs, filter
    #    incoming Redirect (5) and outgoing Destination Unreachable (3).
    #    Note, however, disabling Destination Unreachable (3) is not
    #    advisable, as it is used to negotiate packet fragment size.
     # For bi-directional ping.
    #     Message Types:  Echo_Reply (0),  Echo_Request (8)
    #     To prevent attacks, limit the src addresses to your ISP range.
    #
    # For outgoing traceroute.
    #     Message Types:  INCOMING Dest_Unreachable (3), Time_Exceeded (11)
    #     default UDP base: 33434 to base+nhops-1
    #
    # For incoming traceroute.
    #     Message Types:  OUTGOING Dest_Unreachable (3), Time_Exceeded (11)
    #     To block this, deny OUTGOING 3 and 11
     #  0: echo-reply (pong)
    #  3: destination-unreachable, port-unreachable, fragmentation-needed, etc.
    #  4: source-quench
    #  5: redirect
    #  8: echo-request (ping)
    # 11: time-exceeded
    # 12: parameter-problem
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type echo-reply
             -d $IPADDR -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type destination-unreachable
             -d $IPADDR -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type source-quench
             -d $IPADDR -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type time-exceeded
             -d $IPADDR -j ACCEPT
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type parameter-problem
             -d $IPADDR -j ACCEPT
      iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p icmp 
             -s $IPADDR --icmp-type fragmentation-needed -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p icmp 
             -s $IPADDR --icmp-type source-quench -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p icmp 
             -s $IPADDR --icmp-type echo-request -j ACCEPT
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE -p icmp 
             -s $IPADDR --icmp-type parameter-problem -j ACCEPT
 # ----------------------------------------------------------------------------
 # Enable logging for selected denied packets
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p tcp  -j DROP
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             --destination-port $PRIVPORTS -j DROP
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p udp 
             --destination-port $UNPRIVPORTS -j DROP
      iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type 5 -j DROP
     iptables -A INPUT  -i $EXTERNAL_INTERFACE -p icmp 
             --icmp-type 13/255 -j DROP
     iptables -A OUTPUT -o $EXTERNAL_INTERFACE  -j REJECT
 # ----------------------------------------------------------------------------
         ;;
  stop)
        echo -n "Shutting Firewalling:"
     # Remove all existing rules belonging to this filter
    iptables -F
     # Delete all user-defined chain to this filter
    iptables -X
     # Reset the default policy of the filter to accept.
    iptables -P INPUT   ACCEPT
    iptables -P OUTPUT  ACCEPT
    iptables -P FORWARD ACCEPT
         ;;
  status)
        status iptables
        ;;
  restart|reload)
        $0 stop
        $0 start
        ;;
  *)
        echo "Usage: iptables {start|stop|status|restart|reload}"
        exit 1
esac
echo "done"
 exit 0
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