Enable simple iptables firewall on Debian 7 Wheezy








  • Install iptables-persistent:
    sudo apt-get install iptables-persistent
  • Edit /etc/iptables/rules.v4 and /etc/iptables/rules.v6
    # /etc/iptables/rules.v4
    *filter :INPUT ACCEPT [0:0]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [0:0]
    :RH-Firewall-1-INPUT - [0:0]
    -A INPUT -j RH-Firewall-1-INPUT
    -A FORWARD -j RH-Firewall-1-INPUT
    -A RH-Firewall-1-INPUT -i lo -j ACCEPT
    -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
    # ESP protocol
    -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
    # AH protocol
    -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
    # multicast Bonjour/mDNS
    -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
    # cups printing
    -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
    -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
    -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
    -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
    -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
    COMMIT 
    
    # /etc/iptables/rules.v6
    *filter :INPUT ACCEPT [0:0]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [0:0]
    :RH-Firewall-1-INPUT - [0:0]
    -A INPUT -j RH-Firewall-1-INPUT
    -A FORWARD -j RH-Firewall-1-INPUT
    -A RH-Firewall-1-INPUT -i lo -j ACCEPT
    -A RH-Firewall-1-INPUT -p icmpv6 -j ACCEPT
    # ESP protocol
    -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
    # AH protocol
    -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
    # multicast Bonjour/mDNS
    -A RH-Firewall-1-INPUT -p udp --dport 5353 -d ff02::fb -j ACCEPT
    # cups printing
    -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT 
    -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
    -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
    -A RH-Firewall-1-INPUT -m state --state NEW -p tcp --dport 22 -j ACCEPT
    -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp6-adm-prohibited
    COMMIT 
    

See also




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