Detailed explanation of the use of firewall in Linux

This article mainly introduces the relevant information about the use of firewall in Linux. Here are the commands used to help everyone learn and understand. Friends in need can refer to

Firewall in Linux Summary of usage

Simple use of firewall

1. Display all configurations

firewall-cmd --list-all-zones

2. Reload the configuration

firewall-cmd --reload

3, remove interface from public

firewall-cmd --zone=public --remove-interface=eno16777736

4, query external network Port

firewall-cmd --permanent --query-port=8080/tcp

5, delete port 8080, prohibit external network access

firewall-cmd --permanent --remove-port=8080/tcp

6 , add port 8080 for external network access

firewall-cmd --permanent --add-port=8080/tcp

7, restart the firewall

systemctl restart firewalld

8, forward the request to port 80 to 8080

firewall-cmd --add-forward-port=port=80:proto=tcp:toport=8080

9, check which services and ports the firewall has opened now

[root@localhost ~]# firewall-cmd --list-all
public (default, active)
 interfaces: eno16777736
 sources: 
 services: dhcpv6-client ssh
 ports: 8080/tcp
 masquerade: no
 forward-ports: port=80:proto=tcp:toport=8080:toaddr=
 icmp-blocks: 
 rich rules:

10, set the default zone

irewall-cmd --get-default-zone
firewall-cmd --set-default-zone=trusted

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