Difference between revisions of "Iptables quick guide"

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(allow muliple ports example)
(allow muliple ports example)
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== allow muliple ports example ==
+
== allowing muliple ports ==
 
list of ports
 
list of ports
 
  iptables -A tableName -p tcp  --match multiport --dports port1,port2,port3 -j ACCEPT
 
  iptables -A tableName -p tcp  --match multiport --dports port1,port2,port3 -j ACCEPT

Revision as of 21:20, 20 February 2014

http://www.linode.com/wiki/index.php/Netfilter_IPTables_Mini_Howto

Contents

Changing the default policy in iptables

iptables -P INPUT DROP

allow outbound rsync and insert rule at the top of the chain

iptables -I OUTPUT -p tcp -d 1.1.1.1 --dport 873 -j ACCEPT


allowing muliple ports

list of ports

iptables -A tableName -p tcp  --match multiport --dports port1,port2,port3 -j ACCEPT

example

iptables -A INPUT -p tcp --match multiport --dports 22,80,443 -j ACCEPT

port range

iptables -A tableName -p tcp --dports start_port:end_port -j ACCEPT

example

iptables -I OUTPUT -p tcp -d 1.1.1.1 --dport 1024:65535 -j ACCEPT

IP range example

 iptables -A INPUT -p tcp --dport 22 -m iprange --src-range 192.168.1.100-192.168.1.200 -j ACCEPT  

NAT

show nat rules

iptables -L -t nat

hide nat behind and interface

iptables -t nat -A POSTROUTING -o tun0 -s 192.168.1.0/24 -j MASQUERADE

destination NAT

iptables -t nat -A PREROUTING -d 1.1.1.10 -j DNAT --to-destination 192.168.1.228

saving rules for reload on reboot

on fedora 17

iptables-save > /etc/sysconfig/iptables