Flushing iptables rules

If you need to flush your firewall iptables rules, do not do a direct `iptables --flush` from a remote machine if the default policy is set to DROP packets, you will lock yourself out.

Run the below script instead:

# flushIptables.sh
/sbin/iptables -P INPUT ACCEPT
/sbin/iptables -P OUTPUT ACCEPT
/sbin/iptables -F

or set the default policy to ACCEPT before flushing.

To find the default policy:

# iptables -L -n | grep policy