Configure iptables Firewall

See also

Configuring iptables Firewall:

• http://www.lammertbies.nl/comm/info/iptables.html

IP-address CIDR notation:

• https://en.wikipedia.org/wiki/CIDR_notation

List iptables settings

List iptables settings:

sudo iptables -vnL

Clear all iptables settings

sudo -i

IPTABLES="$(which iptables)"

# RESET DEFAULT POLICIES
$IPTABLES -P INPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
$IPTABLES -t mangle -P PREROUTING ACCEPT
$IPTABLES -t mangle -P OUTPUT ACCEPT

# FLUSH ALL RULES, ERASE NON-DEFAULT CHAINS
$IPTABLES -F
$IPTABLES -X
$IPTABLES -t nat -F
$IPTABLES -t nat -X
$IPTABLES -t mangle -F
$IPTABLES -t mangle -X

exit