Friday, February 17, 2012

minimize attack with iptables

You can minimized DDOS attack with some basic actions with the iptables.
Syn-flood protection:

In this attack system is floods with a series of SYN packets. Each packets causes system to issue a SYN-ACK responses. Then system waits for ACK that follows the SYN+ACK (3 way handshake). Since attack never sends back ACK again entire system resources get fulled aka backlog queue. Once the queue is full system will ignored incoming request from legitimate users for services (http/mail etc). Hence it is necessary to stop this attack with iptables.

Force SYN packets check:
Make sure NEW incoming tcp connections are SYN packets; otherwise we need to drop them:
iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
Force Fragments packets check
Packets with incoming fragments drop them. This attack result into Linux server panic such data loss.
iptables -A INPUT -f -j DROP
XMAS packets
Incoming malformed XMAS packets drop them:
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
Drop all NULL packets
Incoming malformed NULL packets:
iptables -A INPIT -p tcp --tcp-flags ALL NONE -j DROP

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