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IPTables » History » Version 23

Laurent GUERBY, 08/25/2014 07:27 PM

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h1. IPTables
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h2. iptables links
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* http://www.bortzmeyer.org/dns-netfilter-u32.html
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* http://www.stearns.org/doc/iptables-u32.current.html
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* http://ebtables.sourceforge.net/br_fw_ia/PacketFlow.png
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* http://ebtables.sourceforge.net/
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* http://www.inetdoc.net/guides/iptables-tutorial/traversingoftables.html
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* http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg
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* https://en.wikipedia.org/wiki/List_of_router_or_firewall_distributions
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DHCP ?
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sysctl -w net.bridge.bridge-nf-call-iptables=1 
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sysctl -w net.bridge.bridge-nf-call-ip6tables=1 
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iptables -A INPUT -p udp --sport 68 --dport 67 -j DROP
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https://bugzilla.redhat.com/show_bug.cgi?id=512206
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* libnml
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** http://www.spinics.net/lists/netfilter/msg52868.html
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** http://1984.lsi.us.es/~pablo/docs/spae.pdf
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h2. iptables hairpin
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Hair pin / hairpin / hairpinning / NAT reflection
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http://serverfault.com/questions/205040/accessing-the-dnatted-webserver-from-inside-the-lan
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Avec PUB_IP = ip publique sur le host, et LXC_IP l'ip privee de la VM
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<pre>
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iptables -t nat -A PREROUTING -d ${PUB_IP}/32  -p tcp -m multiport --dports 80,443 -j DNAT --to-destination ${LXC_IP}
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iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth0 -j MASQUERADE
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iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -d ${LXC_IP}/32  -p tcp -m multiport --dports 80,443 -j MASQUERADE
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iptables -t nat -A OUTPUT -d ${PUB_IP} -p tcp -m multiport --dports 80,443  -j DNAT --to-destination ${LXC_IP}
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</pre>
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h1. ebtables
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ebtables -A FORWARD -d ff:ff:ff:ff:ff:ff/ff:ff:ff:ff:ff:ff -p IPv4 --ip-prot udp --ip-dport 67:68 -j DROP
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* http://serverfault.com/questions/284290/two-dhcp-servers-block-clients-for-one-of-them
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ebtables -A INPUT --in-interface br0 --protocol ipv4 --ip-protocol udp --ip-source-port 67:68 -j DROP
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ebtables -A INPUT --in-interface br0 --protocol ipv4 --ip-protocol udp --ip-destination-port 67:68 -j DROP
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ebtables -A FORWARD --in-interface br0 --protocol ipv4 --ip-protocol udp --ip-destination-port 67:68 -j DROP
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ebtables -A FORWARD --in-interface br0 --protocol ipv4 --ip-protocol udp --ip-source-port 67:68 -j DROP
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h1. ipset
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http://ipset.netfilter.org/