In such cases, checking the total number of active connections will help you to detect DDOS attack. Active Apache connections on a Linux machine can be found by, netstat -n | grep :80 |wc –l
But, in most of the DDOS attacks, attackers are using fewer connections with more number of attacking IP’s. If you see very high number of connections per IP address, you can suspect a DDOS attack. Netstat -ntu | awk '' | cut -d: -f1 | sort | uniq -c | sort –n You can check the number of Apache connections per IP addresses using the following command:
During DDOS attack, you will be able to see much number of connections from various IP addresses from same or different networks. Due to the DDOS attack, you may encounter heavy server load and sites will run very slowly or unresponsive. In most the cases, web servers are the ones (Apache) which undergoes DDOS attack. Because of this coordinated behavior DDOS attack is also known as a co-ordinated attack. Using these compromised machines/network, it will attack victim.
DDOS ATTACK TOOL UBUNTU INSTALL
Attacker will find the vulnerable machines in a network and will install the virus/Trojan on it. Here, attacker is the system which is the owner of the DDOS attack, but participates silently by making the helpers active participants. This is accomplished by installing a virus or Trojan on vulnerable machines in a network which will be used to attack the victim system with connection floods.ĭDOS attack involves 3 parties: attacker, helper and victim. As a result, the targeted service running on the victim will get flooded with the connections from compromised networks and will not be able to handle it. Distributed Denial Of Service (DDOS) is an attempt to attack a host (victim) from multiple compromised machines to various networks.
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