Denial of service attack, is an attempt through some means to make a computer or network resource unavailable.

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Measure bandwidth by client IP in realtime

I have been recently attacked using DoS attack on random ports. I wasn't able to get the attackers IP and now I would like to find it. What tool can show me bandwidth (in Kbits/Mbits) used by each ...
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2answers
297 views

Block packets based on length

Can I block packets (Specifically UDP) that are > X length? I am getting attacked exclusively by UDP packets that are very large in size from a large number of IP Addresses. I have a legitimate use ...
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243 views

iptables logs but doesn't drop packets

I am trying to create some simple iptables DOS protection rules for my web server. I was doing testing on the following rules: iptables -N LOGDROP > /dev/null 2> /dev/null iptables -F LOGDROP ...
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1answer
1k views

What does enable DoS protection in Synology DSM 5 do?

If I open Control Panel > Security > Protection, check Enable DoS Protection and click Apply, what kind of traffic gets blocked? The text reads "Denial-of-Service (DoS) protection helps to prevent ...
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1answer
188 views

Buffer-stuffing denial-of-service attack

I started seeing this odd sort of effect that resembles denial-of-service attack against a Linux server. The effect is that the network becomes at least partially unusable very much the same as what ...
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1answer
622 views

DoS - Apache threads hanging when not receiving TCP ACKs after sending HTTP response

In summary, I had a case where all Apache threads were hung because all of them were waiting for a TCP ACK from clients after having sent the HTTP page, and because of that, the Apache threads were ...
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1answer
89 views

Can't figure out this attack, getting botnets and something else

About two months ago a site of mine started getting some sort of attack, and after further investigation I found it to be botnet zombies and something else which I can't figure out. My site is not ...
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1answer
75 views

What is idea of web server attack on thinker/js/think.js?

My web server is getting a lot of GET request on thinker/js/think.js and thinker/showSimilarInfo.do. These requests obviously constitute a server attacks. What is point of these attacks? Also, ...
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773 views

Windows Server 2008 Denial of Service Detection

We have a Windows 2008 server that hosts a file share in which a SQL server database is stored and accessed from another SQL server on the same network. Periodically, the database become inaccessible ...
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311 views

How To Protect Tomcat 7 Against Slowloris Attack

I'm using Apache Tomcat 7 to run my webapp on Linux. I scanned it by Acunetix and it's telling me that my webapp is vulnerable to "Slow HTTP Denial of Service Attack". How can I protect it? Acunetix ...
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76 views

Cause for large number of duplicate web requests

I am seeing odd traffic to my web site. On occasion, probably a few times a day, I will get a flurry of requests for the same URI from the same IP address for several minutes, at rates from maybe one ...
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89 views

Preventing NFS Denial of Service

I have a NFS4 server running Ubuntu 10.04 Server, on an enterprise environment with 50+ clients. Overall, everything works fine, but from time to time, some client starts making +1000 NFS operations ...
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Intelligently filtering bogus query strings

A vBulletin site I maintain is on the wrong end of a DoS attack which is inexplicably routing through CloudFlare unimpeded by their DoS protection. The requests look like this: 1 /?ZZZZCQG=XJXAUD ...