Difference between revisions of "Iptables"

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Line 5: Line 5:
 
* <code>sudo iptables -L</code>
 
* <code>sudo iptables -L</code>
 
* <code>iptables-save</code> and <code>iptables-restore</code>
 
* <code>iptables-save</code> and <code>iptables-restore</code>
 
+
* <code> apt-get install iptables-persistent</code>
  
 
== Examples ==
 
== Examples ==

Revision as of 08:03, 22 March 2020

iptables command line utility allows to modify Linux kernel firewall rules.


Basic commands

  • sudo iptables -L
  • iptables-save and iptables-restore
  • apt-get install iptables-persistent

Examples

KVM VNC remote viewer
iptables -t nat -A PREROUTING -i eno1 -p tcp --dport 5900 -j DNAT --to 127.0.0.1:5900
sysctl -w net.ipv4.ip_forward=1
sysctl -p /etc/sysctl.conf


  • Block all output traffic: iptables -A OUTPUT -o ethXXX -j DROP


Block all but a range

iptables -I OUTPUT -m iprange --dst-range <remote_ip>  -j ACCEPT
iptables -I INPUT -m iprange --src-range <remote_ip> -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT DROP


Block all but one IP

iptables -I OUTPUT -d <remote_ip>  -j ACCEPT
iptables -I INPUT -s <remote_ip> -j ACCEPT
iptables -I OUTPUT -d <remote_ip> -j ACCEPT
iptables -I INPUT -s <remote_ip> -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT DROP

Activities

  1. Read iptables Ubuntu howto: https://help.ubuntu.com/community/IptablesHowTo
  2. Read archlinux documentation: https://wiki.archlinux.org/index.php/iptables
  3. Read Stackoverflow iptables questions: https://stackoverflow.com/questions/tagged/iptables?tab=Votes
  4. Review your current iptables configuration
  5. iptables-save

See also

  • https://serverfault.com/a/608976
  • Advertising: