ipcop and loopback

From: Sauro (nospam_at_grazie.it)
Date: 10/09/03 

Date: Thu, 09 Oct 2003 16:27:42 GMT

Hi,
ipcop intrusion detection system returns this advice

Sid:528
Under normal circumstances traffic to the localhost (127.0.0.0/8) should
only be seen on the loopback interface (lo0).

an indicator of unauthorized network use, reconnaisance activity or
system compromise. These rules may also generate an event due to
improperly configured network devices

How to set up an iptable rule to fix it?
Thanks