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We are having Ddos attack, what to do ?

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Join Date: Apr 2013
Posts: 1

We are having Ddos attack, what to do ?

we are having right now a huge ddos attack. Our isp can manage it. Any advise would be appreciated.

Thank you

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Join Date: Dec 2012
Posts: 19
Hello belen!

Sorry to hear about the DDOS attack. You can Stop a DDOS attack by blocking the IP's or rerouting the IP's. This can be a difficult task if you are not a systems administrator; however, the quickest fix is to find the IP(s) of the perpetrator and block them. If you have your Host looking into the attack, they should know how to block them.

Best regards,
James R
InMotion Hosting

Web Hosting Master
Join Date: Apr 2006
Location: United Kingdom
Posts: 582
Unless you or your datacentre have DDoS protection equipment, you should ask your host which IP is being attacked and have it nullrouted until the attack has stopped. If this is your only IP address, then unfortunately it means having your server IP changed.

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Join Date: Jan 2010
Location: Europe
Posts: 367
If you are from nonstandard country like Germany, just block all ips except germany. Search gogole for: block all countries except htaccess

then add it into iptables

also install "config server firewall" with very restrictive settings

(if you have access to your server...)

Try to determine, what exactly is being attacked on your server. also tail IP access logs to determine ranges which attack you.

Try to report DDOS to authoritative site.

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Join Date: Jul 2011
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Posts: 1,951
Report the latest situation as well

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Join Date: Apr 2013
Posts: 20
The best practice would be to null route the IP address at the data center.

Join Date: Jun 2012
Posts: 215
First, what does a "huge" DDoS attack mean - give us some numbers please. Have your ISP given you any detail as to what type of attack it is? If it's using UDP and you don't need UDP, you can ask your ISP to block UDP at border router - some ISP's are nice enough and will do that for you. If the attack is on L4, then collecting IP's won't help at all as they're most probably spoofed. If your attack is on L7 you should be given a list of attacking IP's for you to block, unless they're too many of course.

Now, if your ISP "can" handle the attack, i.e. you don't get nullrouted because of it, there are a number of "tricks" you can try, depending on your web server. Unfortunately, all of these are limited in their effectiveness. I won't go into detail about them here, but you can easily find more information in this forum or just googling:

- Neuron network PyBrain
- Iptables –string
- Apache mod evasive
- nginx testcookie module
- tcpdump

The best approach to DDoS mitigation is a complex of measures that will protect or at least limit the risk from the most common types of attack. The real problem starts when the attack is bigger than your uplink, and you get nullrouted by your host. Then you'd need professional mitigation by people who do this for a living.

Web Hosting Master
Join Date: Aug 2012
Posts: 3,100
If attack is big then I would suggest you to go for a hardware firewall option OR else you can move to the provider who provides DDOS protection.

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Join Date: Apr 2013
Location: California
Posts: 23
Large attacks on hosting providers usually end up in a nullroute.

This is to protect not only you from experiencing over utilization and overages of your bandwidth, but to protect the hosting providers network from issues caused by the Ddos.

The only way TRUE way to prevent ddos is having some type of active filtration at the network level before it reaches the core routers.

If the attack is some slow loris or slow attack causing open connections or high utilization of resources at your server level, you will need to take steps into optimizing your server so that it can effectively combat those types of exploits.

Actively learning French
Join Date: Apr 2009
Location: OnTheWeb
Posts: 2,011
you can limit the amount of times a single ip can access the server which will calm things down considerably. Ie limit the amount of requests for a particular file or IP to about 1 in every 3 requests which will break that in half. Also, use a firewall to help as well.

If you're the smartest person in the room then you're in the wrong room


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