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→Collection of basic Linux Firewall iptables rules
==Collection of basic Linux Firewall iptables rules==
==Collection of basic Linux Firewall iptables rules==
=== Redirect connections to service ===
===Redirect connections to service===
<syntaxhighlight lang="bash">
<syntaxhighlight lang="bash">
sysctl net.ipv4.ip_forward=1
sysctl net.ipv4.ip_forward=1
service networking restart
service networking restart
iptables -t nat -A PREROUTING -p tcp --dport <puerto receptor> -j DNAT --to-destination <ip final>:<puerto de ip final>
# iptables -t nat -A PREROUTING -p tcp --dport <puerto receptor> -j DNAT --to-destination <ip final>:<puerto de ip final>
iptables -t nat -A PREROUTING -p tcp --dport 1081 -j DNAT --to-destination 18.193.226.201:1800
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -t nat -A POSTROUTING -j MASQUERADE
EJ: iptables -t nat -A PREROUTING -p tcp --dport 110 -j DNAT --to-destination 10.10.0.2:110
# EJ: iptables -t nat -A PREROUTING -p tcp --dport 110 -j DNAT --to-destination 10.10.0.2:110
# iptables -L -n -t nat
# sudo iptables -L -t nat --line-numbers
sudo iptables -t nat -v -L PREROUTING -n --line-number
# Delete rule
# sudo iptables -t nat -D PREROUTING {rule-number-here}
</syntaxhighlight>
</syntaxhighlight>