Ddos Attacks / Udp Flood

Jun 25, 2008

one of my costumers server is getting ddos attacks. I solved syn and get attacks with litespeed web server but I have another problem. They started to do udp flood. I m losing connection to my server. I bought new server with 1 gbit port for solving it.

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How To Secure Your Web From FLOOD ; Ddos ; Etc

Jun 20, 2007

some of my friend website is under attack by Ddos ; FLOOD ; and other way to down his site !

how can we save him from these attacks?

else the firewall!

1- is there any program or script to prevent these attacks!

2- is there any rules or script's for Firewall to prevent it!

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DNS DDoS Attacks

Mar 9, 2008

I have a VPS that's on the awknet network and I'm receiving DNS DDoS and I don't think they have anything to stop these attacks, how can I prevent these?

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Protecting From DDoS Attacks

Mar 31, 2009

This is a quote from an unrelated thread in the Dedicated Server Forum, I didnt want to hijack the thread so thought I would bring my question over here:


Originally Posted by HRDev Hady

I believe they use BurstNet, which isn't really a good choice for DDoS-prone sites as their Top Layer devices don't seem to handle attacks very well in my opinion. If you're running a DDoS prone site, you'd likely be better off with a DDoS-specialized provider such as Awknet, Staminus, or Black Lotus. But as mentioned, a lot of attacks can be stopped simply by proper tuning of your IP stack and some simple firewall rules.

My question is as a new Dedicated Server Owner what tuning and rules do I need to implement in order to protect me from these "small scale DDoS Attacks"?

I do not run a DDoS prone site(i hope not lol) but I want to secure myself as much as possible and have a headache free run other than the headaches I cause myself of course.

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Understanding DDOS Attacks

Aug 3, 2009

I want to understand the mechanics of a DDOS attack. I have been doing a lot of reading about them this weekend.

The way I am understanding it, a DDOS attack is done at the network level. It may be requesting that pages from a given website, or websites, are served up, but it basically will effect the entire network. So if 'page display' requests are made to a website(s) that is hosted at ABC Hosting (example only), to the tune of 15GBs then I have to assume that the network will be terribly degraded. If that is so, wouldn't other servers also get taken out?

I believe the architecture of the internet is something like this (example only):

Gnax --> Planet, SoftLayer, RackSpace, etc.. --> Reseller --> Smaller Reseller --> Me

If that is true, is each level along that route using their own networking system or are they all dependent on ones that major Data Center uses?

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Ddos Attacks And A New Webhoster

Jan 12, 2009

My current site has been taken offline since it was being ddos attacked, been with my current hosters for 3years at least, but with recent events they gave me the option to shift my site to a dedicated server or me to move of bascially. (impression I get now, since they seem to be taking longer to reply to my messages) I was being ddos attacked since I refused to give a copy of me software to the visitor at my forums/site.

ive been looking round site after site and I cant make up my mind who to shift too, also if that same idiot who ddos attacked me does it again before I can take any action, I would be in the same situation again.

I have multiple domains and all my sites in total are about 5gig in size, cpu usage is avergae and queries roughly about 15/17 the most, I currently pay £130.00 a yr

I have had few bad experiences with hosting companies but learnt along the way, and assumed my current hosters would be a reliable place to stay at. My sites been offline since friday and I would like to get it back up again asap. Last thing I want to do is rush into a hosting package and be stuck in a dud situation.

I would also like to take action upon the person who has been ddos attacking me, I managed to get hold of his details and I also have confirmation that they are correct, what can be done legally?

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Best Firewall For DDoS Attacks

Mar 23, 2009

My sites are getting heavy DDoS attacks.

What's the best firewall? I'm currently using ACH software firewall but the attacks are getting so bad my site's are going down (apache is shutting down/locking) and sometimes my server even crashes.

Anyone recommend a better software firewall or a really cheap but good hardware firewall?

Could my host just use a router or something as the firewall or would that not do? I'm looking for something really affordable as a solution.

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DDOS Attacks For A Month Now

Mar 14, 2008

Some of my websites have been under a DDOS attack for about a month now. Is there any way I can find who is behind this attack and what their motive is?

How much does it cost to launch a DDOS attack and how long do they usually last?

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My Site Under Ddos Attacks

Aug 22, 2008

i have a shared host

my site under ddos attacks!

i want to upgrade to Dedicated Server

i needed to Dedicated Server contains DDOS protection!

btw: Site visitors 2500 in day!

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DDoS Attacks :: How To Defend

Nov 24, 2008

how to prevent my web servers from DoS attacks?

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How To Reduce Ddos Attacks

Jan 24, 2007

I know there is no device can protect you from ddos attacks, but I wonder which one is the best to help you reduce the attacks? It might be intelligent to "feel" the attacks? Brand names from Cisco, Foundry, Nokia...?

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DrDDoS, DDoS, DoS Attacks - The Works

Mar 18, 2008

As many of you already know, not everyone has the money to spend on physical firewalls, for example a cisco firewall. I would like if everyone could share little tips and tricks towards securing a server they learned over time. Nothing in big detail. I thought if we all share our ideas, it would help quite alot of other people. For example, here is a good layout I believe. Please note this is towards a game server setup.

Shorewall Firewall - Block Unneeded Ports + Block Ping
Apache Web server - Installed with "mod_security"
SSH-Faker - Stop thoes bots from trying to gain access to SSH (Guessing Passwords)
DDoS Deflate - For me, does not really work. (I know, mainly for port 80 so webhosting) But still have it installed.
Bash Scripts Monitoring # of connections per ip with Netstat.
PSad - Monitoring and Reporting Port Scans (Optional automatic timed block)
VNStat - Monitor Current/Monthly/Yearly Bandwidth (Does not hog resources)

I'm guarenteed to of left alot out than just the above. If some of you could also share some simple things you do for securing a server, would be great.

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Hosting Providers And DDoS Attacks!

Nov 24, 2008

Hosting providers and DDoS attacks!

Hello guys! I am looking for a reliable hosting provider! I mean the most important thing for me know is to be sure that my future hosting company will manage to protect my websites against DDoS attacks fully! What hosting company according to your opinion can be considered as the most stable hosting solution against DDoS attacs?

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How Does Hivelocity Deal With DDos Attacks?

Apr 2, 2009

How does Hivelocity deal with DDos Attacks?

Do they have any similar protection to ThePlanet or Softlayer?

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How To Prevent DDoS Attacks CentOS

Jul 23, 2009

I believe that my site is being DDoSed against, and I'm wondering how I can prevent this from happening.

I'm running CentOS 5.3.

Are there any server side scripts of PHP scripts that could be used to dynamically block out IP's that are consuming too many resources on the VPS?

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DDoS :: End The Attacks Or Penalize The Attacker?

Jun 12, 2009

Let's say my site was getting DDOS'd. Let's say I suspected I knew the attacker's home IP address. Would there be anything I could do with this information to either end the attacks or penalize the attacker?

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Q: Prevent DDoS Attacks With Restarting Httpd?

Jan 12, 2008

Can you restart the httpd to get the server online again while you are under an DDoS attack?

The reason for asking is that I was told that when restarting the httpd it should start to work again instantly, and so it seems.

But why? doesnt the attack "continue" after the restart?

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Security To Stop DDoS Attacks And Stuff

May 19, 2009

My host tells me that they have security to stop DDoS attacks and stuff, however today my server load jumped to 17.12 and my site went down giving me a "Network Timeout" error.

My host tells me it's my fault that I am using too many resources. The MOST my site has been on load is 3.06 and that was around lunch time a few weeks back. It's 11:43 and the server load is 17.12? I think my host is pulling my leg. I have not added ANYTHING new to my site and have not changed anything in 3 days. The load has been fine till today.

I use In Motion Hosting.

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GIGEnet Handle Multi Gig DDOS Attacks?

Apr 21, 2008

I am about to get dedicated server with Gigenet.com.

Is this company good as they say they are?

How stable is it?

Can they really handle multi gig DDOS attacks?

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Colo Provider That Handles DDoS Attacks

May 21, 2007

One of the sites I run is a forum with a political component, and 4-5 times over the last week we've been seeing DoS attacks. They're not terribly sophisticated -- generally 1-3 compromised servers throwing packets my way -- but they're enough to clog my pipes and take my sites down.

What I'd like to do is put a new server up at a data center that's D(D)oS aware that can hopefully respond to these attacks automatically. My current provider has been giving solid support, but the best they can do is null route the affected IP, rather than filtering the incoming attack.

Can y'all name a few providers I should look into? Right now I'm just looking to move 1 box (or maybe a box and a firewall depending on the setup).

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Reliable Hosting Provider That Protects Against DDOS Attacks

Dec 26, 2008

Can someone please recommend a hosting company that offers 24 hours toll free phone support with very good DDOS protection services?

Our server has been attacked for the past couple weeks and current host can just null route the IP being attacked but cannot offer anything beyond that...which does not help us. We are talking about large 3 GBPS attacks.

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Syn Flood

May 11, 2009

I've been getting a syn flood for the last week or so.

I've pretty much tried everything I could online but have been unsuccessful in stopping them.

I talked to the data center techs and they basically can't put a stop to it either.

Here's a very small portion of my netstat

tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -

root@xxx [/]# netstat -nap |grep SYN |wc -l

The IP's change often and it's not possible to narrow it down.

So far the things I have done;

syn cookies enabled

reduced time out
echo "1" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_syn_recv

echo "150000" > /proc/sys/net/ipv4/ip_conntrack_max

installed apf but it slowed down the server to a crawl which made my clients really unhappy so had to remove it.

The bandwidth is constantly staying at 30Mbps with slight bumps here and there but every day around 7pm it drops completely to normal levels and the flood stops. It starts back up around 7 in the morning.

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SYN Flood Attack

Jul 28, 2009

We are currently experiencing an SYN Flood attack on our primary production server and are looking for some help in resolving the issue.

Novell SUSE Linux Enterprise Server 10.2-64
SuperMicro X7DBR-E Intel Xeon QuadCore DualProc SATA [2Proc]
Processor Intel Xeon-Clovertown 5320L-QuadCore [1.86GHz]
8GB Memory
@ Softlayer DC in Texas.

Need help within the next hour or two. Please ask any necessary follow up questions and how you might go about resolving the issue (i.e. SYN Cookies, etc.)

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SYN Flood Attack

May 3, 2009

someone decided to attack my webserver and I can't figure out how to block it.

tcp 0 0 localhost:80 SYN_RECV
tcp 0 0 localhost:80 SYN_RECV
tcp 0 0 localhost:80 SYN_RECV

It's literally thousands of those requests overloading apache. The server is fine, the load average is like .8. But none of the website are loading.

We're hosting with ThePlanet, and they're doing a great job at blocking a huge portion of the attack. But we're still getting hit pretty hard. I've got APF installed, and 3 or 4 anti-dos scripts.

Every once in a while a page will load for the websites, I think we've got just under 50 legit connections.

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How Can I Best Work With A Syn Flood?

Jun 11, 2008

How can I best work with a syn flood? I've tried the apf, deflate-ddos etc.... and don't work. Even tried litespeed etc but doesn't work against a 90mbps attack.

If I get a few servers, how would I have it setup to best defend?

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Syn Flood Protection

Jul 25, 2008

one of my server were hit by massive ddos syn atack. target was port 80-apache

i am running centos 5 in xen vps iptables were strong with syn filtering and limit
but...what can do?

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Connection Flood

Mar 8, 2008

I don't know it anymore. Tried everything. I can not reach my server properly. A lot of time time out.

netstat -anp |grep 'tcp|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n


348 connections from an empty IP? i have tried syn cookies, let the firewall block all ports without results.

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How To Prevent DNS Flood

May 28, 2008

Can anyone share tips how to prevent DNS flood on a cPanel and Directadmin server platform on Centos?

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Does Keepalive Off Help In Syn Flood

May 29, 2008

Does keepalive off help in syn flood?

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How To Detect Flood Ftp

May 4, 2008

My server run after 10h sevices ftp is down (network error: connection timed out). may be flood ftp.

how to Detect flood ftp.

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UDP Flood And Bandwidth

Apr 4, 2008

We got hit with a huge bandwidth bill for last month. It was 4X our usual bill. The ISP said that we were the victim of UDP flood attacks from an outside server. We have a sonicwall router and the firewall seems to be blocking the port that the ISP claims the attacks can from. Is it possible that the attacks would still count towards our bandwidth usage even if the connection is refused by our firewall? Our ISP uses 95th percentile billing.

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