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Debian iptables, netstate. DDOS?

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linux-howto

http://serverfault.com – My server has been timing out and crashing lately. I ran this command: netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n Check the picture for result. Does the two IPs in the end ddos me? And how do I block them with IPtables? Thanks. (HowTos)