My two cents :
There are two aspects to the solution. 1)What you as an organization can do and 2)what tier 2 or tier 1 ISP can do.
You have to define a strategy around the above points and take a call as to what extent you would go to protect or prevent a denial of service (depending on how important availability of the website is).
A normal DoS attack can be addressed by having combination of NBAD (Network Based Anomaly Detection), SIEM (Incident & Event correlation mgmt.) and strong IPS policies. To address large attacks(10-30 GB probably), you need to subscribe to cloud based DoS protection service from your ISP, additionally. Anything beyond this, may either be a focused hacker community attack or a state sponsored attack. For this you need to be in touch with country CERT, CSIRT & other govt. telecom regulatory authorities, who can come to your rescue, should there be a persistent attack. There's a nice article on Cisco website describing the solution (with Arbor Peakflow) :

www.cisco.com/assets/cdc_content_elements/networking_solutions/service_p
rovider/ddos_protection_sol/ddos_protection_sol_wp_0603.pdf

Regards,

Manish Dave, CISM

ManishDave|Chief Information Security Officer|Essar Group|
Essar House , 11 , K .K.Marg,Mahalaxmi,Mumbai|400034|Maharashtra|India|
T +91 9930134942|+91 22 66601100 Ext.: 1454|Blackberry PIN 2365D8AE|
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-----Original Message-----
From: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] On Behalf Of Dinh Truong Quang
Sent: Thursday, February 16, 2012 6:24 AM
To: 'Calderon, Juan Carlos (GE, Corporate, consultant)'; htroup (at) acm (dot) org [email concealed]
Cc: security-basics (at) securityfocus (dot) com [email concealed]; webappsec (at) securityfocus (dot) com [email concealed]
Subject: How to prevent Dos and DDoS,

Dear All,

I looking for good solution to prevent DoS, DDoS for my website , Anyone have a good ideal ebout this problem can help me ?pls

Thanks and Best Regards,

DINHTQ

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Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate. We look at how SSL works, how it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442
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