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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-iptables.sh 1867 2016-05-04 12:22:08Z raphael.pion $
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# $Id: alcasar-iptables.sh 1872 2016-05-05 08:45:44Z richard $
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# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
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# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
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# This script writes the netfilter rules for ALCASAR
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# This script writes the netfilter rules for ALCASAR
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# Rexy - 3abtux - CPN
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# Rexy - 3abtux - CPN
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#
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#
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# Reminders
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# Reminders
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# Saving SET of connected users if it exists
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# Saving SET of connected users if it exists
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ipset list not_filtered 1>/dev/null 2>&1
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ipset list not_filtered 1>/dev/null 2>&1
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if [ $? -eq 0 ];
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if [ $? -eq 0 ];
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then
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then
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	ipset save not_filtered > $TMP_users_set_save
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	ipset save not_filtered > $TMP_users_set_save
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	ipset save havp_set >> $TMP_users_set_save
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	ipset save havp >> $TMP_users_set_save
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	ipset save havp_bl_set >> $TMP_users_set_save
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	ipset save havp_bl >> $TMP_users_set_save
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	ipset save havp_wl_set >> $TMP_users_set_save
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	ipset save havp_wl >> $TMP_users_set_save
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	ipset save not_auth_yet >> $TMP_users_set_save
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	ipset save not_auth_yet >> $TMP_users_set_save
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	ipset save users_list >> $TMP_users_set_save
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	ipset save users_list >> $TMP_users_set_save
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fi
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fi
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# loading of NetFlow probe (ipt_NETFLOW kernel module)
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# loading of NetFlow probe (ipt_NETFLOW kernel module)
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then
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then
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	ipset -! restore < $TMP_users_set_save
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	ipset -! restore < $TMP_users_set_save
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	rm -f $TMP_users_set_save
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	rm -f $TMP_users_set_save
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else
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else
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	ipset create not_filtered hash:net hashsize 1024
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	ipset create not_filtered hash:net hashsize 1024
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	ipset create havp_set hash:net hashsize 1024
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	ipset create havp hash:net hashsize 1024
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	ipset create havp_bl_set hash:net hashsize 1024
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	ipset create havp_bl hash:net hashsize 1024
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	ipset create havp_wl_set hash:net hashsize 1024
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	ipset create havp_wl hash:net hashsize 1024
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	#utilisé pour l'interception des utilisateurs non authentifiés au réseau
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	#utilisé pour l'interception des utilisateurs non authentifiés au réseau
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	#used for intercepting users not connected to the network
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	#used for intercepting users not connected to the network
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	ipset create not_auth_yet hash:net hashsize 1024
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	ipset create not_auth_yet hash:net hashsize 1024
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	ipset create users_list list:set
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	ipset create users_list list:set
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	ipset add users_list havp_set
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	ipset add users_list havp
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	ipset add users_list havp_wl_set
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	ipset add users_list havp_wl
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	ipset add users_list havp_bl_set
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	ipset add users_list havp_bl
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	ipset add users_list not_filtered
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	ipset add users_list not_filtered
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	ipset add users_list not_auth_yet
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	ipset add users_list not_auth_yet
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fi
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fi
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#############################
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#############################
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# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
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# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
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# redirection DNS des usagers 'havp_bl' vers le port 54
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# redirection DNS des usagers 'havp_bl' vers le port 54
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# redirect DNS of 'havp_bl' users to port 54
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# redirect DNS of 'havp_bl' users to port 54
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
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# redirection DNS des usagers 'havp_wl' vers le port 55
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# redirection DNS des usagers 'havp_wl' vers le port 55
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# redirect DNS of 'havp_bl' users to port 55
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# redirect DNS of 'havp_wl' users to port 55
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55
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# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
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# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
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# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
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# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_http -- ACCEPT "
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_http -- ACCEPT "
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# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
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# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
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# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
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# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set bl_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
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# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
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# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
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# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
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# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -m set ! --match-set wl_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -m set ! --match-set wl_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
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# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
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# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
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# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
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# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
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# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
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# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
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# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
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# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
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# Redirection des requêtes NTP vers le serveur NTP local
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# Redirection des requêtes NTP vers le serveur NTP local
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# Redirect NTP request in local NTP server
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# Redirect NTP request in local NTP server
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
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#############################
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#############################
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#        FORWARD            #
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#        FORWARD            #
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#############################
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#############################
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# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl_set
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# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
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# Deny IPs of the SET bl_ip_blocked for the set havp_bl_set
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# Deny IPs of the SET bl_ip_blocked for the set havp_bl
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set bl_ip_blocked dst -p icmp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p icmp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set bl_ip_blocked dst -p udp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p udp -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set bl_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
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$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
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# Rejet des requêtes DNS vers Internet
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# Rejet des requêtes DNS vers Internet
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# Deny forward DNS
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# Deny forward DNS
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$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
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$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset