iptables

iptables

Remove rule from iptables

Check for a chain and line number you like to delete
iptables -L -n --line-numbers

Remove from chain
iptables -D < chain > < line number >

If all correct, save iptables
iptables-save

Quick notes into firewall

Basic command definition
iptables -A -i < interface > -p < protocol (tcp/udp) > -s < source > --dport < port no. > -j < target >

Check current iptables rulles
iptables -L -v

Check iptables and their particular traffic

iptables -L -v

How to remove record from fail2ban database

Find chain/rule name with IP address
iptables -L -n

Find jailname
fail2ban-client status

iptables gui
fwbuilder

see ip tables
iptables -L

use: write a script some-settings.sh & run
sh +x some-settings.sh

If u need to block a particular IP address within a linux firewall, than this command

iptables -A INPUT -s 65.55.44.100 -j DROP

remove rule from iptables
iptables -D INPUT -s 65.55.44.100 -j DROP

check iptables
iptables -S