Questions tagged [ddos]

Distributed Denial Of Service (DDOS) is the intentional paralyzing of a computer network by flooding it with data sent simultaneously from many individual computers (so-called zombies) which are used to stage DDOS attacks

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1answer
89 views

Does using the same mail and web server increase a risk of DDos due to IP exposure?

I use the same server for sending my emails and web hosting. I send user registration and support forum mails from my server and occasional marketing mails or newsletters. I read on a CloudFlare blog ...
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Is there any way to stop DDOS attacks? [duplicate]

As many other webmaster I am facing problems with DDOS attacks. I have tried denying offending IP addresses from htaccess files and using bigger and better hosting, but I am unable to stop the attacks ...
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1answer
193 views

Dealing with a DDoS: horizontal vs vertical scaling?

I'm reading this paper about DDoS protection in AWS. One of the benefits of EC2 is that depending on the instance, it can scale for minimizing the effect of the attack. In the paper there are two ...
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6answers
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How can I remove an unknown device from my wifi network?

I have an OnHub (from Google), and there is a device I don't know on my wifi network. Is there some way for me to kick it, or DDoS it, whether through some command line command on windows or ubuntu, ...
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1answer
254 views

In house mitigation for a volumetric DDoS attack

Can a volumetric DDoS attack be mitigated by some in house defense or does the defense always need to be on the cloud? If yes, then why?
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1answer
2k views

Securing API against DDoS attacks

I have designed a backend service which is only accessible via a custom REST API. As I understand, services such as CloudFlare are designed to protect HTTPS traffic, and do not apply for custom APIs. ...
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2answers
246 views

How hackers implemented DDoS attack with 602 Gbps?

Everybody's heard about DDoS attack with 602Gbps Bandwidth that crashed BBC site, But is really Botnets and hacked servers can implements an attack in this scale ?
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1answer
553 views

Wordpress pingback attack

I am getting Wordpress pingback attach on my server. I tried to put if condition on nginx to block deny all requests that contains "Wordpress" in the header. It works fine but still nginx get millions ...
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2answers
96 views

Preventing a web-page from getting hit from another server

A DDoS attack may result from a website attempting to access the resource of another website. For instance, example.com (attacker) is trying to access resources on example.net (victim). The ...
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1answer
1k views

How can CloudFlare save your website if the attacker knows the IP of the server?

I saw CloudFlare's services where you need to change the DNS of your domain name to their provided DNS address. The traffic coming as "mywebsite.com" goes through CloudFlare. What if I have a ...
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2answers
487 views

DDoS Mitigation - Whitelist or Blacklist Incoming SOURCE Ports?

For a network offering webservices, I have had recommendations to blacklist a couple of common incoming DESTINATION ports, such as UDP 53, to combat the increasing load from DDoS. I'm wondering if it ...
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0answers
431 views

CPU load of iptables to deny IPs during DDoS event [closed]

If a server has an external IP address protected with an iptables whitelist rule to reject all by default except from 3 ip addresses ip1, ip2 and ip3. If someone identifies this external IP address, ...
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How to find which domain in my VPS triggered a DDoS attack with WP xmlrpc

Today, my data center suspended my VPS for DDoS attack reasons. They say one of my clients, that has WordPress website, started a DDOS attack to another websites using xmlrpc. But I don't know which ...
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1answer
341 views

What is an Origin Error Attack?

Similar to my previous question here, however I thought it was best to ask two separate questions rather than combining them into one. From The Forrester Wave™: DDoS Services Providers, Q3 2015 ...
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2answers
282 views

What is a Poison Dart attack?

From The Forrester Wave™: DDoS Services Providers, Q3 2015 report, (emphasis mine): Attack types defended CGI request, denial of capability, diluted low rate degrading, direct, DNS request ...
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2answers
6k views

Where can I get a list of “bad” IP addresses that are likely to be used by attackers or spammers? [closed]

Is there an open source project or a list of "bad" IP addresses or ranges that are likely to be used by attackers or spammers? UPDATE: ideally I want it to be a service call so I can call it using ...
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1answer
428 views

What's the best way to block all external proxy IP's which could be used for pivot points or as a DDOS Source?

At the simplest form - the question is to block external proxy due to an emergency situation due to which management have forced technical teams to get a solution to block all the external proxy or ...
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1answer
1k views

What is the role of IP spoofing in DDoS attacks?

I've read that IP spoofing is often used in denial of service attacks, and I've also just recently read about ingress filtering, which attempts to use blacklisting to filter out spoofed IP addresses ...
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1answer
155 views

Why is a DNS Amplification attack considered a DDoS attack?

My understanding is that a DNS Amplification attack involves sending a DNS resolver a bunch of requests with a spoofed sender address, which is the victim's. The DNS responds to this IP address with a ...
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1answer
562 views

Must an attacker using a Smurf attack be on the same network as the victim?

I'm learning about Smurf Attacks. Since they need to use a broadcast address, doesn't that mean they can't work over the internet? For example if an attacker sends a router the packet with the ...
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1answer
4k views

What are the most popular DNS amplification attack tools for Windows and Linux? [closed]

I would like to test my edge-router firewall rules against some DNS amplification attack traffic. I could run some DNS lookup utility in an endless loop, but maybe there are some dedicated utilities ...
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2answers
116 views

How can perpertrators of denial of service attacks, determine the impact their attack has had?

Although I know how a user could mitigate Dos attacks and detect their presence e.g. checking packets received and sent, comparing current CPU usage to normal, comparing network usage to normal etc. ...
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1answer
63 views

Additional Protection Against DDoS

We have subscribed to an upstream ISP's protection service to protect against DDoS. I am thinking of developing a incident procedure in case my ISP's DDoS mitigation fails (highly unlikely right?). ...
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2answers
550 views

What danger can come from D-DoS over VPN

Every time I use VPN, I get a message to notify me to be sure that my PC is 'healthy' from pots infections. Also I've read in this article to stay away from that. My question, what damage could ...
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3answers
441 views

Why does an overload of requests give one root access all of a sudden?

There's this saying that using a DDOS-attack, people first attack a server using millions of concurrent requests and by doing that they miraculously gain access to the server. How does this work? Why ...
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1answer
3k views

Can a Cisco ASA 5505 block this DDoS attack?

Since more than a week ago, my dedicated server (located in ovh.com) has been under TCP SYN (I think) attack. OVH don't care about it but this attack is killing my server with a high CPU load (...
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1answer
274 views

DDoS Attack Protection

Recently I've been threatened with an IP Address DDoS attack. I was wondering in what ways and how could I stop this attack. I'd really like to be able to do this without my parents finding out.
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2answers
4k views

Digging into DDoS attacks (includes hostile IP's from multiple honeypots)

I have been tracing a series of DDoS attempts, and am wondering if anyone else has seen anything like them. I've downloaded the following Powershell script which scrapes Terminal Server (RDP) Event ...
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3answers
7k views

TCP versus UDP resilience to DDoS

I am building a service that I can implement equally well with either TCP or UDP. If I use TCP, I expose vulnerability to SYN flood and other attacks on TCP protocol. If I use UDP, it will be harder ...
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1answer
643 views

Common attacks when no ports are open

If you have a web server with all ports closed (except, of course, the necessary HTTP) what kind of attacks can an attacker use to hack into the system? Are the only vulnerabilities stuff like ...
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1answer
3k views

How can someone DDoS me?

If I've not opened the port 80, how can someone DDoS me? Is there a method or is it possible? Someone said that it's possible, but I'm not so sure, that's why I'm asking here.
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2answers
253 views

How do DoS attacks work on non-servers?

I understand how DoS/DDoS attacks work on servers. If I have not been misled, it is possible to DoS/DDoS a system that does not act as a server, but is still connected to the internet. How is this ...
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0answers
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iptable ip_conntrack_max testing

I was trying to understand how ip_conntrack_max works so i have created two VM and set ip_conntrack_max to 10000 I used hping to open 10000 udp connection on VM using following command hping --udp -...
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3answers
5k views

TSource Engine Query DDoS attack

My gaming machine is under DDoS attack and when I used Wireshark I found the following string "TSource Engine Query" in all UDP packets coming from random IP's. I found using Google that some gaming ...
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1answer
4k views

Is a ddos attack that makes ssh auth attempts a possible way for attackers to significantly impact your system?

I'm noticing on my digital ocean server, that I'm getting a high volume of auth attempts. I don't have any passwords since I use sshe key auth, so I'm not worried about a break in. But can a ...
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3answers
1k views

How to Stop DDoS Attacks by simple function on web server?

I have an overview ideas of the preventing ddos attacks, in a simple way. Please clarify me, if my thinking is wrong. Option 1 From the basic understanding of the DDOS attacks is that the attacker ...
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1answer
559 views

Siri DDoS over FM Radio

A few days ago I was driving home and suddenly Siri started to talk by herself in reply to a command I never gave. As you can imagine I have the "hey siri..." feature active, so I can make calls ...
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1answer
4k views

Is it possible to force client use TCP instead UDP for DNS queries?

Assume I am managing a firewall between DNS server and clients. Is there any way to force clients use TCP rather than UDP, so we can prevent DNS spoof types of DDoS attacks?
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2answers
790 views

Protecting server from bogus HTTP Requests

What would be the recommended approach to block those typical bogus HTTP requests that the server gets bombarded with? Also has this attack/nuisance been named yet or is it generalized as Bot Activity?...
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2answers
530 views

2 External IPs to prevent DDoS?

In my home network, I currently have a Hitron cgnm-2250 acting as a modem/router combo with an IP Passthrough option enabled for a 2nd router connected to it (ddwrt nighthawk x6 r8000). I already have ...
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2answers
106 views

Website Visited by Unresolved Ip

My Website is flooded with unknown visiters Awstats says that my website getting thousands of hits in few seconds. I am using robots.txt and .htaccess, but the problem stays there. Please help me ...
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1answer
824 views

kernel: Intrusion disconnecting me

I've read about it a little but I'm concerned. It never happened before and for last 5 hours my router gets kernel: Intrusion alerts similar to these: As soon as the kernel: Intrusion is detected, it ...
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3answers
2k views

DDoS attack - where are packets dropped?

I'm researching into ddos attacks to get a better understanding. I've read lots from this community however one thing I couldn't get my head around is packet dropping. So lets say I've identified an ...
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5answers
110 views

Does services provided by different companies for DDoS protection work well?

Is it necessary to use any DDoS service provided by different web hosting provider and other people? We know, they are running their business to provide security to thousands of web property. They are ...
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1answer
23k views

dns reflection attack vs dns amplification attack

Over the past few weeks I have heard discussions about a DNS reflection attack and a DNS amplification attack. Is there truly a difference between the two or are people just using 2 different names ...
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1answer
183 views

Different types of DDoS attacks [closed]

What is behavior of UDP flood, TCP SYN flood, Ping of Death and Smurf attack?
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5answers
2k views

DDOS Server Attacks & Domain Names

I'm currently with a web hosting account whose servers seem to be constantly down due to DDOS attacks. I check my analytics daily and I'm seeing a major surge in fake traffic for several of my URLs ...
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5answers
4k views

DDOS - security or operational risk?

The chief security officer of a medium sized IT company (400-500 employees) recently released a bulletin in which he stated that DDOS attacks are not a security risk but an operational one. Also I was ...
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2answers
174 views

Infected employee using office VPN was part of a DDoS attack

Recently, our office VPN was taken down by our ISP after discovering a DDoS attack. Apparently an employee connected to our VPN is infected. There were no logs at the time of the event. Besides ...
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1answer
645 views

DDoS attacks targeting Android

I am currently studying some Android topics and I've been having difficulties finding answers regarding DDoS attacks. My question is: Are Android devices vulnerable to DDoS attacks or does Android ...

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