I have a similar situation with a different website.  It is a site that
several users visit to update a company web page.  Every time the site
is visited I get TCP_Overlap_Data events like crazy.  I have looked at
this from every possible angle and am still at a loss as to why it
happens.


-----Original Message-----
From: Chris Caydes [mailto:[EMAIL PROTECTED] 
Sent: Thursday, February 20, 2003 11:28 AM
To: [EMAIL PROTECTED]
Subject: [ISSForum] TCP_Overlap_Data .... CNN.com

Hello everyone,

My RealSecure 6.5 network sensor sends many
TCP_Overlap_Data events (around a hundred per minute
during business hours), apparently caused by HTTP
accesses made to the CNN.com website.
The alert is generated on CNN.com's reply packets,
like on the example below. The source address
64.236.24.137 resolves to i3.cnn.net.

Has anyone else experienced similar phenomenon ? The
CNN.com website is very popular in my company, plus it
contains pages that refresh automatically.

'TCP_Overlap_Data' event detected by the RealSecure
'network_sensor_1' at 'xxx.xxx.xxx.xxx'.
Details:
                 Source Address: 64.236.24.137
                 Source Port: HTTP (80)
                 Source MAC Address: 00:30:85:D3:D0:C2
                 Destination Address: xxx.xxx.xxx.xxx
                 Destination Port: 27881
                 Destination MAC Address: xx:xx:xx:xx:xx:xx
                 Time: 2003-02-20 16:07:54 UTC
                 Protocol: TCP (6)
                 Priority: high
                 Actions:
DISPLAY=Default:0,EMAIL=Default:0,VIEWSESSION=Default:0
                 Event Specific Information:


Regards,
Chris


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