Firewall

most /proc/net/xt_recent/ATTACK
/proc/net/xt_recent/BANNED1
/proc/net/xt_recent/BANNED2
/proc/net/xt_recent/BANNED3
/proc/net/xt_recent/BANNED4
/var/log/iptables.log

apt install ipcalc
ipcalc 0.0.0.0/7
ipcalc 224.0.0.0/3
ipcalc 96.0.0.0/4

#!/bin/bash
#
# Resets all firewall rules
 
echo "Stopping firewall and allowing everyone..."
 
#
# Modify the following settings as required:
#
 
IPTABLES=/sbin/iptables
 
#
# Reset the default policies in the filter table.
#
 
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
$IPTABLES -P OUTPUT ACCEPT
 
#
# Reset the default policies in the nat table.
#
 
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
 
#
# Reset the default policies in the mangle table.
#
 
$IPTABLES -t mangle -P PREROUTING ACCEPT
$IPTABLES -t mangle -P POSTROUTING ACCEPT
$IPTABLES -t mangle -P INPUT ACCEPT
$IPTABLES -t mangle -P OUTPUT ACCEPT
$IPTABLES -t mangle -P FORWARD ACCEPT
 
#
# Flush all the rules in the filter, nat and mangle tables.
#
 
$IPTABLES -F
$IPTABLES -t nat -F
$IPTABLES -t mangle -F
 
#
# Erase all chains that are not default in filter, nat and mangle tables.
#
 
$IPTABLES -X
$IPTABLES -t nat -X
$IPTABLES -t mangle -X