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Firewalld https://www.youtube.com/watch?v=T2g6nxRCnLQ&ab_channel=NetSecProf

firewall-cmd --list-all (default zone= public )

Start and stop deamon

[root@sn9120210070 ~]# firewall-cmd --state
running

sudo systemctl status firewalld.service

sudo systemctl start firewalld.service

disable the firewalld sudo systemctl stop firewalld.service

Services

list all services available firewall-cmd --get-services

add service to a zone

firewall-cmd --add-service=https ( will add to the default zone= public or "untrusted" or what ever default zone)

firewall-cmd --reload

list all ICMP type

firewall-cmd --get-icmptypes

https://superuser.com/questions/1114065/getting-firewalld-to-allow-ping-requests

allow ICMP

( by default block, inversion=allow ;-) firewall-cmd

--permanent

--add-icmp-block-inversion firewall-cmd --permanent --add-icmp-block=echo-reply firewall-cmd --permanent --add-icmp-block=echo-request firewall-cmd --reload

Code Block

title	before and after
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[root@conductor t128]# firewall-cmd --list-all
t128 (

by default block, inversion=allow ;-)

active)
  target: DROP
  icmp-block-inversion: no
  interfaces: eth0
  sources:
  services: https netconf salt-master ssh zookeeper
  ports: 443/tcp 930/tcp 4505-4506/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:  <<<<<<<<<<<<<<<< BEFORE
  rich rules:


[root@conductor t128]# firewall-cmd --permanent --add-icmp-block-inversion
success
[root@conductor t128]# firewall-cmd --permanent --add-icmp-block=echo-reply
success
[root@conductor t128]# firewall-cmd --permanent --add-icmp-block=echo-request
success
[root@conductor t128]# firewall-cmd --reload
success
[root@conductor t128]# firewall-cmd --list-all
t128 (active)
  target: DROP
  icmp-block-inversion: yes
  interfaces: eth0
  sources:
  services: https netconf salt-master ssh zookeeper
  ports: 443/tcp 930/tcp 4505-4506/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks: echo-reply echo-request   <<<<<<<<<<<< AFTER
  rich rules:

[root@conductor t128]#

traceroute

firewall-cmd --permanent --add-icmp-block=time-exceeded
firewall-cmd --permanent --add-icmp-block=port-unreachable
firewall-cmd --reload

add permanent service firewall-cmd --add-service-https --permanent

create service

Ports

add port firewall-cmd --get-ports

add permanent port

host or IP address or subnet

sudo firewall-cmd --permanent --add-source=192.168.2.50

sudo firewall-cmd --permanent --add-source=192.168.2.0/24

on the conductor

Zones

list zones firewall-cmd --get-zones

zones config info firewall-cmd --zone=home --list-all

add zones

create zone

NAT or masquarade

...

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