Linked Questions

4 votes
1 answer
447 views

Windows server 2008, a very small DDoS is able to kill my server [duplicate]

So I have this i7 3.2Ghz 6-core dedicated server running Windows Server 2008, with a 1Gbps internet speed. Everything runs fine and nice, and the machine is strong enough to handle even up to 700 Mbps ...
0 votes
1 answer
892 views

iptables connection limit does not work on debian [duplicate]

I'm trying to set up some basic DOS protection. The following iptables rule works on a CentOS box but NOT on debian (wheezy). #limit the parallel http requests to 50 per class C sized network ...
0 votes
2 answers
743 views

netfilter ip_conntrack and (d)DoS [duplicate]

Does using netfilter.ip_conntrack in the kernel in anyway help mitigate (d)DoS attacks or does it make it worse? I know it adds the ability to track connections and such but just curious if it helps ...
1 vote
2 answers
1k views

PHP web hosting: how to prevent clients to DOS/DDOS? [duplicate]

I'm providing a partial web hosting solution where my clients may upload and execute their own php scripts. Besides the security routine I'll have to check (off topic here) I would like to know ...
0 votes
1 answer
2k views

TCP DOS: How to terminate CLOSE_WAIT connections? [duplicate]

One of my servers is getting DOS'ed - there are a large number of connections in the CLOSE_WAIT state which are preventing legitimate users from connecting to the system. So is there any way to close ...
4 votes
2 answers
287 views

Will MX records with a longer TTL help mitigate effects of DoS attack? [duplicate]

We have our email hosted at Google Apps, and have our DNS servers for the domain setup at Namecheap. About a month ago our website went down (not a big deal, since it's most just a contact info page),...
1 vote
2 answers
2k views

blocking udp attack ip with iptables [duplicate]

I was trying to block an ip of ( network stresser tool - a ddos websites selling ddos bots by seconds online ) the first one i was trying to block with iptables : iptables -A INPUT -d 173.193.26.73 -...
4 votes
3 answers
435 views

I know how to scale my software, but how to prevent downtime because of network outages? [duplicate]

We are running rather large LAMP sites which scale well software wise. We use redundant load balancers in front of a bunch of webservers using MySQL via a proxy in master-slave-slave-slave. We are ...
2 votes
6 answers
605 views

Securing against DDoS [duplicate]

My client would like to have his eCommerce (custom-made) site secured from DDoS attacks. What strategies can I implement? There are multiple forms in the purchasing flow --- searching, drilling-down ...
0 votes
3 answers
18k views

Block All UDP traffic (to prevent ddos) [duplicate]

I have been receiving countless ddos attacks the last couple of weeks. Just now I caught one while I was running iptraf. Normally 99.9% of the packets used on my server are TCP packages, and not UDP. ...
0 votes
1 answer
688 views

Mitigate DDos on Windows box [duplicate]

I would love to know, If you know some way to mitigate DDos/Dos attacks on Windows. In Linux we can Mitigate using the IPTables Almighty, but I wonder If there is something like that in Windows. I am ...
0 votes
0 answers
176 views

How can I log and maybe even block IPs that send lots of incoming UDP traffic?

we run a voice / teamspeak server which receives legitmate traffic on port 9987 from many ips. Sometimes we get DDoSed. So people use single Servers and send 1-3 Gbits of UDP Floods to that port. This ...
1 vote
2 answers
1k views

Is it possible to prevent DDoS attacks? [closed]

I recently read that certain industries—including the one I work in—are more likely than others to be targeted by a DDoS attack. Can you give me some tips on how to prevent DDoS attacks?
2 votes
4 answers
3k views

Mitigating an http flood? [duplicate]

I have a ddos protection proxy in place to deal with SYN floods and such. But http floods are still getting through. For some reason their ddos proxy is not blocking any of the flood. So there are ...
5 votes
3 answers
5k views

DDOS using ntp server

I've heard about new kind of DDOS where ntp is used for reflection . My questions are really simple : Can you please give details on how they work and clarify? Since ntp is ran over UDP, I suppose ...

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