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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Different types of DDoS attacks

What is behavior of UDP flood, TCP SYN flood, Ping of Death and Smurf attack?
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Machine compromised [on hold]

Recently, one of our GUI based jump box (ec2-instance) used for deployment to other ec2-machines got compromised, and was used for DDOS attack to other sites. Amazon reported abuse for the same. On ...
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106 views

Mitigating DDOS in P2P systems

In P2P systems where performance and response times are critical individual clients are susceptible to DDOS by publicly exposing their IPs. While there are various mitigation solutions available at ...
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56 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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72 views

VPN protection against DDoS [closed]

I am thinking of getting a VON, for DDoS protection and other various things, though what if an attacker knows my real IP already?
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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
58 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
81 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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10 views

Probabilistic packet marking content ID field

For Above image: All routers are using PPM. What will be the content ID field if 1) R1 = mark packet, R2= Mark packet, R3 = Not mark the packet. 2) R1 = Not mark packet, R2= Mark packet, R3 = Not ...
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122 views

What's the typical approach to caching invalid authentication attempts?

Clients (actually software pieces developed by some random dudes all over the Internet) are authenticating on a web server using "basic" authentication scheme and to do so they are passing the ...
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2answers
65 views

Hijack attacked SSL/TLS-connections?

I think we all heard the news that China used unencrypted HTTP-connections to drive DDoS attacks on targeted websites. Now within the last few months we've learned about three new attacks ...
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2answers
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Web Developer's responsibility for DDoS [closed]

If my website is targeted for a DDoS attack after I have been paid for completing the website, and I get an angry phone call from the client regarding outage of service, what do I do? It hasn't ...
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2answers
49 views

unprivileged or privileged malware for botnets

For those malwares which are used to organize botnets to DDOS a website, they just need to send and receive HTTP packets. Do they need to be privileged? If they dont need to be privileged, is it true ...
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Can someone launch a DOS attack on my IP

Suppose, I have a static IP on my PC and is known to others. None of my softwares listen for remote connection. Is it still possible for someone to DOS attack me in such cases? If yes, how it is ...
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1answer
66 views

What would a typical packet of a DDOS attack look like? [closed]

In terms of header, size and payload? We've been learning about DDOS attacks in class and they've been telling us all of the abstract ideas, but haven't told us what the actual makeup of the packets ...
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3answers
642 views

Can the IPS technology in a UTM prevent a DDoS attack?

Does a Unified Threat Management appliance (UTM) with Intrusion Prevention (IPS) enabled have the ability to prevent a DDoS attack? I have read some articles and none of them have a perfect ...
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1answer
126 views

Is there a layer 1, 2, 5 and 6 DDoS attack? [closed]

I'm doing some research on DDoS attacks, and I seem to only be finding information on layer 3,4 and 7 attacks. When I saw 3/4 and 7 DDoS attacks, I figured they were the most popular, but there were ...
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2answers
68 views

Hosting multiple websites on the same server - Prevention from DoS

I have an server which contains around 4 instances hosted on it. I am aware that if a DoS attack happens on one of the instances it will take down all the other instances too. How to prevent such a ...
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1answer
94 views

wordpress server visitor log contains a script, what's the risk?

I see this in my WP statistics: Is it safe to click on the link? Under what conditions will the script be triggered?
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0answers
39 views

Downloadable Autonomous System contact information

When under (a security) attack, it might be useful for the victim to first identify the source IP, then potentially contact the offending ISP. There seem to be plenty of tools for the part where an IP ...
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1answer
42 views

System backup in case of attack?

My system will be running for a well known insurance company within the UK, it will hold and process a lot of information for claims, brakdowns etc etc. I am worried that the company and the site as ...
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0answers
37 views

Slow internet, IP Flood? [duplicate]

Lately, I've been getting slow internet. I checked wireshark and noticed I keep receiving in matter of seconds thousands of UDP packets that my computer does not respond to, and here's the twist: ...
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1answer
73 views

Slow internet - Worried about spammed packets

got a weird question and I'm not sure if I should even post this on here but I couldn't think of anywhere better to ask. Lately, I've been getting some internet speed issues. I closed literally every ...
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1answer
79 views

Possible virus hogging bandwidth [duplicate]

My computer might have a virus infection. I have used Norton Internet Security and Power Eraser to scan the computer but it still did not work. The traffic on my PC looks like this I used resource ...
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3answers
505 views

External websites in logs [duplicate]

I have a website, let's call it www.good.com. I've been getting a lot of requests to www.good.com under completely different URLs than www.good.com. I suspect this traffic is also causing some site ...
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1answer
245 views

Am i getting DDOS attacked?

There has been some weird activity with my wifi router after somebody threatened to ddos me. I am looking at my wifi router's activity logs and i don't know what i am looking for. What happens is my ...
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58 views

Is DDOS more common than DOS?

Which attack takes place more often over the internet? I would have assumed DDOS due to the amount of botnets around today.
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2answers
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Is this a DDOS attack?

I lost my internet connection for about 15 minutes and I checked my netgear router log and found these 3: [DoS Attack: ACK Scan] from source: 114.77.184.189, port 44822, Tuesday, March 24,2015 ...
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150 views

Udp ddos prevention

Okay,if i wanted to prevent a udp flood are these 2 solutions sufficient: -Say that i have only one port open like port 80 however i never use udp interactions what if i blocked the udp port leaving ...
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76 views

How can I launch DHCP starvation attack in WLAN?

In WLAN, due to MAC association on Access Point (AP), I can't send the DHCPDISCOVER messages using random MAC addresses. But if I keep my original MAC address as the source ethernet MAC a and random ...
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1answer
548 views

How is DDoS possible if you're not listening to the DoS traffic?

I've read about DDoS attacks and specially the amplification techniques. For example, the DNS amplification technique where you can send queries to open resolvers pretending to be the victim, then [if ...
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1answer
110 views

What are the repercussions of a DDoS attack on a website? [closed]

First of all, I'd like to know what exactly a DDoS attack is- my understanding is that it's a collection of infected or "zombie" computers, all controlled by a central computer, with the intent of ...
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1answer
72 views

DDoS Detection devices available in the market? [closed]

Wanted to know what DDoS detection devices are currently available in the market.My organisation has its dedicated firewalls and routers.But we wanted to know if there are any devices in the market ...
0
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1answer
124 views

Identifying attacks by network activity

Is it possible (and how) to tell from a network dump if there is a buffer overflow attack, DoS or brute force attack? A DDoS would be more obvious to identify, but those attacks mentioned above I ...
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10answers
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DDoS - Impossible to stop?

Is it possible - in theory - to stop1 a DDoS attack of any size? Many people claim it's impossible to stop DDoS attacks and tell me I just shouldn't mess with the wrong people on the internet. But ...
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2answers
279 views

If I send 4mbps of data to a friend with 4mbps connection, will I DDoS him?

Suppose my friend has a connection of 4mbps. If I just send him 4mpbs of random data with my server, wouldn't it block his connection? Even if the router has firewalls and closed ports, isn't enough ...
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1answer
58 views

rate limiting and access filter for web application

I had a requirement of rate limiting and dynamically access controlling access to web application dynamically I want to be able to rate limit access turned on / off dynamically black/white list ...
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3answers
5k views

Why is it so hard to trace origins of DDOS attacks?

According to the July 2009 cyber attacks Wikipedia article, US & South Korean governments suffered a DDOS attack on their websites. However, up till now they have not been able to find any ...
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2answers
127 views

Under constant ddos, even after switching 3 differnet routers? [closed]

I started getting ddosed when i pissed some minecraft nerd offt on some twitch chat, which he got banned from, and i never saw him again, but i moved to a hotel for about a week, and i kept getting ...
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Mitigating DDoS With Command of Ports

Is there any type of DDoS where closing or taking full control of all port capabilities would be useful in mitigation of an attack?
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1answer
582 views

Azure Based DDOS Mitigation, Azure Based Firewall?

I'd like to mitigate DDOS attacks, for an Azure vm server (just TCP ports 80 and 443). Azure appears to be a great solution. I can't find any Azure documentation, as to if there is an Azure ...
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1answer
69 views

Do the firewall hardware specifications have to be better than the network it protects?

If I need a bodyguard I'll have to hire someone whose muscles are much tougher than mine. If a server can't handle a DoS/DDoS attack because it consumes it's resources does this mean the firewall has ...
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145 views

Is there any method to prevent/trace ddos attack?

I have a debian linux server which run a few online game services. I have some competitors in this area and i think one of them is behind the ddos attacks. I have full access to the router, so I set ...
47
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6answers
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What techniques do advanced firewalls use to protect againt DoS/DDoS?

It is hard to protect a server against Denial of Service attacks, DoS/DDoS. The two simple ways I can think of is to use a server with much resources (e.g. CPU and memory), and to build the server ...
5
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3answers
430 views

DoS by consuming all hosting trafic

Given a small website hosted on a small data plan, is it possible for someone to keep doing requesting for my website URL or just an image hosted on my website that will consume all my permitted ...
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1answer
58 views

Mitigate DDos on Windows box

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. ...
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3answers
127 views

Theoretical game server DDoS prevention question

I may not understand how DDoS attacks work at this point, but Im just wondering if this would work for a game server? IF each time a new connection is attempted and the packet or connection type is ...
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3answers
283 views

How does blacklisting an IP using a firewall protect against DDoS attacks?

I just read that to protecting a server against a DDoS attack involves blacklisting IP addresses. What does the term blacklisting mean? What does it mean for a firewall to drop a connection? How ...
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3answers
20k views

Stopping DDOS TCP SYN and UDP flood attacks

I would like to know if it's possible to stop a TCP SYN OR ICMP Flood attacks if these attacks are detected at time. What is the most accurate process to filter these addresses if the only way is to ...
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1answer
61 views

What are features of a suitable tool for tracking and reporting security incidents? [closed]

What are features of a suitable tool for tracking and reporting security incidents? Is it a bad idea to have one central repository for tracking all types of incidents, from helpdesk issues, to ...