Categories
SecOps

How to immediately drop incoming and outgoing packets using Dynamic Firewall Manager

Enable panic mode to immediately drop incoming and outgoing packets using Dynamic Firewall Manager.

Query panic mode.

$ sudo firewall-cmd --query-panic
no
$ echo $?
1

Enable panic mode.

$ sudo firewall-cmd --panic-on
success

Query panic mode.

$ sudo firewall-cmd --query-panic
yes
$ echo $?
0

Disable panic mode.

$ sudo firewall-cmd --panic-off
success

Do not try this in a production environment as the access to the server will be cut-off.