A humble newbie question re probes

From: Please invert everything left of the _at_ to reply (_at_)
Date: 05/02/03 

Date: Thu, 01 May 2003 22:27:55 -0700

A machine at 216.239.168.78
which is registered to an ISP, UNIVERSAL TELECOM, in Corvallis, Oregon
persists in probling our (Comcast-served) home LAN.

An inquiry to them resulted in them telling us to go away and ask our ISP
what they are doing.

Why should a strange system be probing our home LAN?

You thoughful and on-topic responses will be truly appreciated.

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