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--- iptables:basic_commands [2016/10/07 13:57] – peter
+++ iptables:basic_commands [2019/11/29 16:34] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== IPTables - Basic commands ======
-Install iptables
-<code bash>
-sudo apt-get install iptables
-</code>
-Policy Chain Default Behavior
-iptables --policy INPUT DROP
-iptables --policy OUTPUT DROP
-iptables --policy FORWARD DROP
-Block all connections from the IP address 10.10.10.10.
-<code bash>
-iptables -A INPUT -s 10.10.10.10 -j DROP
-</code>
-Block all of the IP addresses in the 10.10.10.0/24 network range.
-<code bash>
-iptables -A INPUT -s 10.10.10.0/24 -j DROP
-</code>
-or
-<code bash>
-iptables -A INPUT -s 10.10.10.0/255.255.255.0 -j DROP
-</code>
-Block SSH connections from 10.10.10.10.
-<code bash>
-iptables -A INPUT -p tcp --dport ssh -s 10.10.10.10 -j DROP
-</code>
-Block SSH connections from any IP address.
-<code bash>
-iptables -A INPUT -p tcp --dport ssh -j DROP
-</code>
-Connection States
-<code bash>
-iptables -A INPUT -p tcp --dport ssh -s 10.10.10.10 -m state --state NEW,ESTABLISHED -j ACCEPT
-iptables -A OUTPUT -p tcp --sport 22 -d 10.10.10.10 -m state --state ESTABLISHED -j ACCEPT
-</code>