Captured data length < Ethernet header length

["Mark Anderson" <cronus () whitedust net>]

Forgive me if this has been discussed already but I am
a new subscriber to the list.

I'm running Snort Version 1.8.1-RELEASE (Build 74) which
is probably an old version but I haven't had the chance to
update it. I regularly get the following message in my
syslog;

snort: Captured data length < Ethernet header length! (0 bytes)

I was hoping someone could shed some light on what 
it means. I'm not even sure how to write a snort rule to
determine which machine it in on the network thats
generating these packets. Or is it my copy of snort ?

Any help would be greatly appreciated.

Mark Anderson.