I typed iptables -F by mistake, how to undo?

Question

I typed iptables -F by mistake, how can I undo it?

I see now strange activity on my routers IP, scanned it and saw that strange ports are open. How can I block these ports?

See here: https://unix.stackexchange.com/questions/61957/does-iptables-f-permanently-delete-all-iptables-rules — valiano, Jul 23 '18 at 15:08
I do not have /etc/sysconfig/iptables, I only see /etc/sysctl.d/ and systemd/ — Gilfoyle, Jul 23 '18 at 15:21

score 1 · Accepted Answer · answered Jul 23 '18 at 15:11

1

According to This Post iptables -F only flushes out the currently running rule set and everything will be back after reboot.

To block ports, you can follow This Howto or use the following (blocking incoming on port 80 as an example):

sudo iptables -A INPUT -p tcp --destination-port 80 -j DROP
sudo service iptables save

answered Jul 23 '18 at 15:11

Joshua Besneatte

yeah I found it out by myself with help of you guys! thanks – Gilfoyle Jul 24 '18 at 10:43

1 Answers1