Linked Questions

8
votes
8answers
14k views

How to prevent a LOIC (DDOS) attack? [duplicate]

The program LOIC (in the news a lot the last days) causes a lot of damage. What can I do on my server to prevent this kind of attacks? Auto-block ip when receive a strange connection? Because mostly ...
2
votes
4answers
4k views

How can I stop a currently active DDoS attack? [duplicate]

My VPS is under a DDoS attack. I cannot access RDP, and I cannot take it offline, or access it in any way at all. What can I do? They are not trying to bruteforce, just trying to stop access to the ...
3
votes
6answers
8k views

How long do DDoS attacks last? [duplicate]

I realize the answer to this question will vary, which is why I'm asking it. If you've suffered a DDoS attack before - how long did it last? Just trying to get an idea of how long we'll have to ...
4
votes
3answers
740 views

100mb/s upgrade to 1gbps network - To Prevent DDOS [duplicate]

I have been under constant DDOS attack the last couple of weeks. Now it seems my servers network is being flooded till it just doesn't have space anymore to receive and send normal packages. I run ...
0
votes
3answers
5k 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. ...
8
votes
6answers
599 views

DDoS. Are we that helpless? [duplicate]

With recent DDoS incidents related to wikileaks, I can't help but feel that pretty much all sites online are very vulnerable to such attacks. Visa, MasterCard (to name a few) have shut down because of ...
3
votes
1answer
6k views

How can I detect a DDoS attack using pfSense so I can tell my ISP who to block? [duplicate]

Last week my network was hit by a DDoS attack which completely saturated our 100 MBps link to the internet and pretty much shut down all the sites and services we host. I understand (from this ...
4
votes
6answers
2k views

How to survive anonymous DDOS attack? [duplicate]

Every time the anonymous group targets a website, they are able to take it down.. even for large corporates / governments with professional. I read (basic theory) about dealing with normal DDOS ...
6
votes
2answers
10k views

Too many TIME_WAIT state connections! [duplicate]

I've been reading about this everywhere all day, and from what I've gathered, TIME_WAIT is a relatively harmless state. It's supposed to be harmless even when there's too many. But if they're jumping ...
5
votes
4answers
2k views

Mitigate DDoS attack with HAProxy [duplicate]

We were targeted earlier today by a DDoS attack. There was 20x as many connections as normal on our load balancer (HAProxy), and all the backend nodes continued to go down during this attack. System ...
2
votes
2answers
718 views

DDoS Attacks on Game Servers [duplicate]

We run a fairly large game server hosting company with about 60 machines running Server 2008, and DDoS attacks something we have been dealing with for a long time. Unfortunately, due to the prices of ...
0
votes
4answers
5k views

How to prevent DDOS syn attack [duplicate]

I am running a site with 2 GB ram on centos. Using LAMP Everyday for a few hours (about 3 to 4 hours) apache goes down. It takes too long to load a page and most of time it shows Request time out. ...
3
votes
5answers
2k views

Apache DDoS Protection in router (pFsense) [duplicate]

I'm soon going to change my infrastructure when I buy a new server. I'm going to replace my D-Link DIR-655 router with an pFsense router (and probably use the 655 as an AP) using my old server ...
4
votes
2answers
6k views

How Can I Harden the TCP/IP Stack in Windows Server 2008? [duplicate]

I would like to make sure that my Windows 2008 servers are hardened against DDOS attacks. There is a Microsoft Technet article on Hardening the TCP/IP stack, but it was last revised in January 2006. ...
3
votes
5answers
910 views

Incoming DDoS Attack, It Looks Like An ICMP Attack, So What Do I block? [duplicate]

I recently have been getting hit by an attack that is very small around 70MBPS but causes TONS of upload...All signs point to ICMP. I realized in my firewall I have CSF firewall running on CentOS, ...

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