[ 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
guide: https://help.ubuntu.com/community/IptablesHowTo“In this article I will try to show some unusual use of the
command.”