TCP Portsweep and TCP Portscan

["Ashgate Publishing Information Technology" <itnotify () ashgate com>]

Hi,

I'm new to snort.  I have sensors setup on both the WAN side and the LAN
side of my network.  I'm seeing many, many alerts that are triggered on both
sensors. They are:

[**] [122:3:0] (portscan) TCP Portsweep [**]

and

[**] [122:1:0] (portscan) TCP Portscan [**]

The source is always a local workstation, and a large number of these are
coming from one workstation and the destination host is usually in the
yahoo.com domain.  I have also seen this alert when users visit ebay.

Can anyone provide any insight on what this is?  I'm relatively new to IDS
so I'd appreciate some pointers.

Thanks,

Nick




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