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02.04.2006 at 11:58PM PST, ID: 21724369
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7.4

iptables to prevent ddos

Asked by valleytech in Linux Network Security

Tags: , ,

dear, all
my server's being under heavily attacked. my server's OS: linux whitebox with iptables, apache2.0
i've configed my kernel with appropriate parameters to prenvet SYN flood as well as dDos. My Iptables is also written with this: to drop stealth scans
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,RST FIN,RST -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,ACK FIN -j DROP
-A INPUT -p tcp -m tcp --tcp-flags ACK,URG URG -j DROP
-A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH -j DROP

I added this rule in order to prevent the attacks from that IP address
-A INPUT -s 220.231.65.27 -p tcp -m tcp -m limit --limit 50/sec --limit-burst 150 -j REJECT --reject-with icmp-port-unreachable

However, most of my web's vistors used dial up internet, one IPs = thousands of visitors, so that the rule is not a good solution.

The attacker send out a bunch of request with POST (apache2, www.myweb.com/server-status shows this) to a URL.
is there anyway by iptables for my to block certain accesses from a MAC address.
or is therey any solutions by iptables for this kind of attacks

thanks alot alotStart Free Trial
[+][-]02.05.2006 at 02:50AM PST, ID: 15875746

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[+][-]02.05.2006 at 09:30AM PST, ID: 15877375

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[+][-]02.05.2006 at 01:52PM PST, ID: 15878775

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[+][-]02.05.2006 at 11:51PM PST, ID: 15880938

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[+][-]02.06.2006 at 02:05AM PST, ID: 15881390

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[+][-]02.06.2006 at 11:57AM PST, ID: 15886166

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About this solution

Zone: Linux Network Security
Tags: ddos, iptables, prevent
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Solution Provided By: XoF
Participating Experts: 4
Solution Grade: A
 
 
 
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