[ Thanks to linuxaria for this link.
“Iptables requires elevated privileges to operate and
must be executed by user root, otherwise it fails to function. On
most Linux systems, iptables is installed as /usr/sbin/iptables and
documented in its man page, which can be opened using `man
iptables` when installed.
“For a basic guide to iptables, I suggest the excellent Ubuntu
“In this article I will try to show some unusual use of the