Difference between revisions of "Iptables quick guide"
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http://www.linode.com/wiki/index.php/Netfilter_IPTables_Mini_Howto | http://www.linode.com/wiki/index.php/Netfilter_IPTables_Mini_Howto | ||
| − | == Changing the default policy in iptables == | + | ==rule basics== |
| + | |||
| + | === Changing the default policy in iptables === | ||
iptables -P INPUT DROP | iptables -P INPUT DROP | ||
| Line 8: | Line 10: | ||
iptables -I OUTPUT -p tcp -d 1.1.1.1 --dport 873 -j ACCEPT | 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 --match multiport --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 | ||
| + | |||
| + | ===allow icmp echo-reply=== | ||
| + | iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT | ||
== NAT == | == NAT == | ||
| Line 15: | Line 34: | ||
'''hide nat behind and interface''' | '''hide nat behind and interface''' | ||
iptables -t nat -A POSTROUTING -o tun0 -s 192.168.1.0/24 -j MASQUERADE | 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 == | == saving rules for reload on reboot == | ||
Latest revision as of 21:47, 3 November 2014
http://www.linode.com/wiki/index.php/Netfilter_IPTables_Mini_Howto
Contents |
rule basics
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 --match multiport --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
allow icmp echo-reply
iptables -A INPUT -p icmp --icmp-type echo-reply -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
