Getting logs for DOS Attack:Sync Attack on cisco CSS 11501 frequently.

Hi ,
Since couple of weeks , i am getting below DOS attack logs on cisco CSS.Can anyone help me out about how can we avoid this? and how to deal with it.
04/23/2011 17:27:28:Enterprise:DOS Attack:SYN Attack -> 10 times
04/23/2011 17:30:15:Enterprise:DOS Attack:SYN Attack -> 10 times
04/24/2011 11:20:32:Enterprise:DOS Attack:SYN Attack -> 11 times
04/24/2011 11:24:48:Enterprise:DOS Attack:SYN Attack -> 12 times
04/24/2011 15:30:42:Enterprise:DOS Attack:SYN Attack -> 10 times
Thanks
Manish

Hi Nicolas,
Why i am asking about DOS attack as i am facing some issues for the 2 VIPs configured in cisco CSS 11501.
Can you help me troubleshooting the issue?
I have coming across some Load Balancing issues for the 2 VIPS configured on Cisco CSS11501.
We have cisco CSS 11501. We have 2 VIPs configured on it for FE and BE servers.Now Client calls to FE VIP and LB forwarding it to server and then FE server calls the BE VIP which goes through the same LB and forward to BE server under the VIP.When we start load test, we have observed after 2 hour test, application team getting HTTP timeout.As this application is used by Call center so getting timeout is bad.
Need to troubleshoot this issue if there is any problem from LB End.
Please find the attached file for VIP configs.

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Source Address:             10.6.27.133 Destination Address:         10.6.84.69
Event Type:                 Illegal Src Total Attacks:                        3
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SYN Attacks:                 14,843,912 Maximum per second:                 284
LAND Attacks:                         0 Maximum per second:                   0
Zero Port Attacks:                    0 Maximum per second:                   0
Illegal Src Attacks:         18,325,982 Maximum per second:                 224
Illegal Dst Attacks:                743 Maximum per second:                   4
Smurf Attacks:                        0 Maximum per second:                   0
DOS Attack Event 12:
First Attack: 31/08/2010 22:18:34
Last Attack: 31/08/2010 22:31:26
Source Address:             10.6.67.167 Destination Address:     113.213.43.145
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<Header>
<Product>Microsoft SQL Server Reporting Services Version 2009.0100.1600.01 ((KJ_RTM).100402-1539 )</Product>
<Locale>English (United States)</Locale>
<TimeZone>W. Europe Standard Time</TimeZone>
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