RVS 4000 DDOS Attacks

Hello!
Since I got a NAS System connected to my Network (one Month ago) I get attacked every day by DDOS attacks.
I Just set my NAS to the DMZ of my Router and opened 3 Ports for Service of QNAP.
I assume that at this moment I got scanned and thererfore the intrusions started.
For the last month I experianced nearly every Day Internet Connection Problems and the Router didn't respond anymore.
As I found last week a new Firmwar-Version I updated my router, enabled IPS and applied the latest Security file.
In the IPS Report I found loads of DDOS and Synflood attacks.
With IPS my Router Works and I got no more problems that my Inet access is corrupted BUT now I got the Problem that my
downloadrate sunk to 20Mbit from formerly 100Mbit.
I already wrote my ISP about this situation and want them to change my WAN-IP Adress but they to it only in very urgent cases.
Is there any option to operate the RVS 4000 save AND fast???

Sorry I seem to have no access to the documentation,
I get:
Forbidden File or Application
The file or application you are trying to access may require additional entitlement or you are trying to access a file with an invalid name. Additional entitlement levels are granted based on a users relationship with Cisco on a per-application basis.
If you feel you have reached this page in error, please try one of the following methods to locate your document:
If you are manually entering the URL into your browser location bar, be sure to include the file name of the page you are trying to access (file names typically end in .htm, .html or .shtml).
Use the Search feature located in the upper right section of this page.
Return to the Cisco.com Home or select a primary site area from the top navigation bar.
Consult with your Cisco Account Manager to confirm you have the appropriate entitlement to access this page.
If you would like to contact someone about this problem, please click on the Contacts & Feedback link below.
Back
Sorry to bother You again but I have to know in other words if I have extra costs for the IPS or just have to purchase the device like the RVS4000?!? I still do not understand what you mean with paid feature.
Sorry english is not my mothertounge.

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