Originally Posted by rakesh_88
Hi friends how can I prevent DDOS attack ,I can not pay highly paid softwares
If you're talking about web server you have only few options:
1. Using CloudFlare.
Pro: it's good for the money
Con: it's not free
2. Using Apache mod_evasive.
It working like fail2ban if you have used it but for Apache.
Pro: it can help you with simple attacks.
Con: won't help if you attacked by big botnet if your uplink is just overwhelmed by their requests.
3. Manual mode.
You can manually block IP subnets from where you attacked.
Pro: simple and free.
Con: efficiency is low and you will do that while your server is already attacked and overloaded.
I can suggest you to spent some money to the CloudFlare if your website can be attacked or configure mod_evasive if you need to just to be prepared.