Linked Questions

24
votes
6answers
24k views

How can I prevent a DDOS attack on Amazon EC2?

One of the servers I use is hosted on the Amazon EC2 cloud. Every few months we appear to have a DDOS attack on this sever. This slows the server down incredibly. After around 30 minutes, and ...
0
votes
0answers
48 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
votes
2answers
153 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
4answers
2k 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
3answers
2k 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 ...
1
vote
0answers
271 views

Curl Sourced DDoS: How to detect it & how to stop?

Okay, an Ubuntu server I manage fell victim to a DDoS attack today. Usually this is unpleasant but not that big a deal. A few high server load moments & then it passes. Today was clearly ...
0
votes
1answer
130 views

Attack from strange IP address, how to block?

Looking through the mail logs I've noticed a lot of these: Apr 7 11:33:25 s123456 pop3d: IMAP connect from @ [::ffff:192.96.206.9]checkmailpasswd: FAILED: web14p3 - short names not allowed from @ ...
0
votes
1answer
56 views

A botnet may be attacking our site right now, how should we respond? [duplicate]

Not sure if SO is the right forum, but we're in need of help and perhaps programmatic elements may comprise the final solution. Instead of downvoting, please recommend where to post this question, and ...
3
votes
3answers
595 views

Can't stop DDOS [duplicate]

I need a little help dealing with ddos. I'm experiencing 1gb ddos attack on my server and I don't know how to stop it. (1gbs is the maximum speed of the server.) I've the following iptables rules: ...
0
votes
1answer
91 views

DDoS Attack Mitigation Techniques [duplicate]

Our hosting is set up on Amazon EC2 servers, which have been performing great. The problem we run into are spikes in requests for invalid URLs from scripts/bots looking for security holes. When ...
0
votes
1answer
103 views

DDoS Protection [closed]

Let's say I order a half rack (22U) at any colocation company. They give me a GiGe port and I need DDoS protection. If I use a slot in my rack for Arbor protection, will I be protected up to a certain ...
-1
votes
3answers
309 views

How to fight request spam (DDOS i guess) on CentOS server [duplicate]

lately i'm trying to fight DDOS on my CentOS 6.4 server. I have installed CSF and I've set it quite strictly. Yet there is a URL that have like 1000 requests and max 2 per IP (smart ddos-er I guess). ...

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