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--- networking:firewall:iptables [2012/04/09 01:21]
gcooper created
+++ networking:firewall:iptables [2022/07/29 11:12] (current)
gcooper
@@ Line 4: / Line 4: @@
 http://www.cyberciti.biz/faq/rhel-fedorta-linux-iptables-firewall-configuration-tutorial/
+List rules:
+<file>
+iptables -nL <table> -v
+</file>
+===== Flush All =====
+  - **Set the default policies** for each of the built-in chains to ''ACCEPT''
+  - **Flush** the ''nat'' and ''mangle'' **tables**
+  - **Flush all chains** (-F)
+  - **Delete all non-default chains** (-X)
+  - **Flush all counters** (-Z)
+<file>
+iptables -P INPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -P OUTPUT ACCEPT
+iptables -F
+iptables -X
+iptables -Z
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+iptables -t raw -F
+iptables -t raw -X
+</file>
+===== Docker =====
+How to firewall external access to Docker 'published' ports example:
+<file>
+iptables -L DOCKER-USER >/dev/null || iptables -N DOCKER-USER
+iptables -I DOCKER-USER 1 -i eth0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
+iptables -I DOCKER-USER 2 -i eth0 -m conntrack --ctstate INVALID -j DROP
+iptables -I DOCKER-USER 3 -i eth0 --match multiport -p tcp --dports 80,443 -j ACCEPT
+iptables -I DOCKER-USER 4 -i eth0 -m conntrack --ctstate NEW -j LOG --log-prefix "DOCKER-USER_DROP "
+iptables -I DOCKER-USER 5 -i eth0 -m conntrack --ctstate NEW -j DROP
+iptables -nL DOCKER-USER -v
+</file>

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