Documentation

iptables

Manage iptables firewall rules.

Attributes

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Parameters

Parameter	Required	Type	Values	Description
chain	true	string		The iptables chain to modify.
comment		string		Comment for the rule (requires iptables comment module).
ctstate		string		Connection tracking states (ESTABLISHED, RELATED, NEW, INVALID).
destination		string		The destination address/network.
destination_port		string		The destination port.
flush		boolean		Flush all rules in the chain. [default: `false`]
flush_all		boolean		Perform a flush before adding rules. [default: `false`]
in_interface		string		The input interface.
ip_version		string	ipv4 ipv6	The iptables command to use (iptables, ip6tables). [default: `"iptables"`]
jump		string		The jump target (ACCEPT, DROP, REJECT, LOG, etc.).
match		string		Match extensions (state, conntrack, etc.).
out_interface		string		The output interface.
policy		string		Set the policy for the chain (ACCEPT, DROP, REJECT, etc.).
protocol		string		The protocol of the rule (tcp, udp, icmp, all).
rule_num		string		Append rule as a specific rule number (1-based).
source		string		The source address/network.
source_port		string		The source port.
state		string	present absent	Whether the rule should be present or absent. [default: `"present"`]
table		string		The iptables table to modify. [default: `"filter"`]
to_destination		string		The target for DNAT/SNAT (e.g., “192.168.1.1:80”).
to_ports		string		The ports for DNAT/SNAT (e.g., “8080-8090”).
to_source		string		The source for SNAT (e.g., “192.168.1.1”).

Examples

- name: Allow HTTP traffic
  iptables:
    chain: INPUT
    protocol: tcp
    destination_port: "80"
    jump: ACCEPT

- name: Allow established connections
  iptables:
    chain: INPUT
    ctstate: ESTABLISHED,RELATED
    jump: ACCEPT

- name: Allow traffic from specific source
  iptables:
    chain: INPUT
    source: "192.168.1.0/24"
    jump: ACCEPT

- name: NAT masquerade for outgoing traffic
  iptables:
    table: nat
    chain: POSTROUTING
    source: "10.0.0.0/24"
    out_interface: eth0
    jump: MASQUERADE

- name: Forward port 8080 to 80
  iptables:
    table: nat
    chain: PREROUTING
    in_interface: eth0
    protocol: tcp
    destination_port: "8080"
    jump: DNAT
    to_destination: "127.0.0.1:80"

- name: Remove a specific rule
  iptables:
    chain: INPUT
    protocol: tcp
    destination_port: "8080"
    jump: ACCEPT
    state: absent

- name: Set the policy for the INPUT chain
  iptables:
    chain: INPUT
    policy: DROP

- name: Flush all rules in INPUT chain
  iptables:
    chain: INPUT
    flush: true