RHEL firewall
Date: 2022-12-15Last modified: 2023-02-17
firewalld is the default firewall on Red Hat Enterprise Linux.
Table of contents
List
firewall-cmd --list-all
Possible output:
public (active)
target: default
icmp-block-inversion: no
interfaces: wlp3s0
sources:
services: dhcpv6-client ssh
ports:
protocols:
forward: no
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
Allow
Deny
Timeout
⚡
Tip
It is possible, especially on remote systems, that an incorrect setting results
in a user locking themselves out of a machine. To prevent such situations, use
the --timeout option. After a specified amount of time, any change reverts to
its previous state. Using this options excludes the --permanent option.
For example, to add the SSH service for 15 minutes:
firewall-cmd --add-service=ssh --timeout 15m