Is My Server Under DDOs Attack

Feb 2, 2008

is this DDOs attack : .....

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DDOS :: Someone Is Trying To Attack Our Server

Jul 4, 2006

Someone is trying to attack our server (I think so). When running apache status there are a LOT of connections from one network, all requesting the same page. But running: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n does show any of these IP's. So script blocking ddos attacks wont work. Anyone know what can I do about this?

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Softlayer, My Server Is Under Ddos Attack

Jun 18, 2008

my server is being ddosed and the network utilisation is at 40% of 1gpbs

i asked to softlayer to check and they said my programs/services is taking that much bandwidth

any1 can help me?

if my server is under dos attack wat can i do?

because the bandwidth used is about 50gb/hr

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Ddos / DoS Attack, Won't Stop. Server Is Down

Jul 7, 2009

My server was hit with flood recently, to the point where I was unable to log in via SSH. Running 'netstat' command showed I was getting flooded with thousands of http requests from China/Saudi Arabia/Korea. I installed APF firewall and added those countries to deny list.

Next day I was hit from Russia and Romania and some others. By reading some posts on this site, on top of APF, I have also installed Dos Deflate. It was working for couple of hours, but then it stopped working. I could not even log in via SSH. My provider told me that APF was using all of the "conntrack" connections. I have increased conntrack connections to 130,000 (I have 4 Gigs of RAM on my server). Is that possible? (I have about 300 IP ranges in my APF deny list).

Next day, I was got hit by different attack: there was 11 Mbps of malicious traffic on average sent to my server. My provider put me behind firewall to mitigate against that kind of attack.

Currently, I am both behind the hardware firewall and I have APF and Dos Deflate running. However my server is not accessible.

When I request, I can log in for couple of minutes, but then I get kicked out.

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Ddos Attack Still Dropping My Server

Feb 16, 2008

I have been getting ddossed for the last month, my host has tried many things on my server that are commonly suggested around here, however we have over 40 000 connections hitting the server from this attack and it keeps rising.

I am on LiteSpeed.
I also have NetScreen 50 firewall which helped for a little while, however the server still keeps going down.

I am spending $420 a month on my hosting for my dedicated server
Now it is costing me an extra $400 a month to have Netscreen firewall running which is a waste of money as it can not effectively keep the server running and i'm not sure if I can even effectively afford that much money a month, however I might need to spend a little more if need to just get the server running finally.

basically I need some options as to what I can do. I would like to stay with my host, they have been good to me, however if my options are better suited to changing then let me know. I just really need to get my server running great asap and to keep it running great when i'm away from the internet.

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Better Way To Protect My Server From DDos Attack?

Jun 25, 2008

today i have DDos Attack in my server in port :80

what is the better way to secure my server from DDos Attack

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How Do You Handle DDOS Attack On Client's Server

Jan 6, 2009

I have a client who's server has got DDOS attack. It causes the network disruption and DC wants to turn off the server. My client feels it stupid to turn off the server just like that.

can large attacks prevented server side?

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DDOS Attack Kill Only Apache Server

Jan 11, 2007

I have a question related DDOS attack. My hosting provider told me that my Server was DDos attacked few days ago. But in those days my server worked fine only apache server was down. The strange fact is that in the same day with this "DDOS attack" one of theyr admins worked something on SSL section of my server and during this operation the SSL hosts were down and httpd worked slow.

Inthe passed 3 months httpd worked very slow and after 2-3 restarts of httpd service the load droped down below 3.00 . I believe theyr httpd service was already with problems and that SSL configuration cause that apache failure in that day with "ddos attack"

I repeat in that day ONLY ssl hosts worked fine and non SSL hosts were down.

It's possibile on DDOS attack that load to be unde 0.5 , SSL hosts to work fine, FTP, Mail and other stuf to work like there is nobody on server (VERY FAST)?

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DDOS Attack

May 29, 2009

My server is using too many httpd process..I think iam under DDOs attack..I executed the following command..

netstat -an | grep :80 | sort
and the result is this

tcp 0 1491 ::ffff:95.211.10.169:80 ::ffff:213.215.100.110:2263 LAST_ACK
tcp 0 1493 ::ffff:95.211.10.169:80 ::ffff:85.207.126.231:52694 LAST_ACK
tcp ....

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Is This A DDoS Attack?

Aug 4, 2009

I have a windows server, and today it has a large inbound traffic, so I tried to disable all web service, and after that, the result of netstat -an shows no connection at all, but the server still has large inbound traffic,

Do you have any idea about this?

What should I do now?

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DDOS Attack Help

Mar 19, 2008

Our server is in attack since 4 days. Http port busy all the time.

When I type :

netstat -na | grep ":80" | awk '{print $5}' | cut -d. -f1-4 | cut -d: -f1 | sort -n| uniq -c | sort -n | tail -5

It shows :

[root@ ~]# netstat -na | grep ":80" | awk '{print $5}' | cut -d. -f1-4 | cut
-d: -f1 | sort -n| uniq -c | sort -n | tail -5
2 65.19.130.24
2 83.149.120.9
4 204.15.73.243
35 222.254.103.142
5128
[root@ ~]#

I wonder the hidden IP of 5128 ??? How to know it?

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Am I Under DDOS Attack?

Jun 21, 2007

The server getting slow with high I/O diskwait then normal, although load is not high.

here is the output of: netstat -anp |grep 'tcp|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n .................

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Ddos Attack On VPS

Apr 12, 2009

i had installed anti ddos or firewall,but those are useless.His attacks are such great that The server and all the vps are down now. One told me that I should check the ips and receive ips. The attacker is so skillful .describe the best method to defeat him. Be sides the attacker use diffirenet ips in each attack,I block him by iptables but no use…. His attack occupy all the ram and I have to resetart the server… Now this time his attack lead to shutting all the vps down

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Under Ddos Attack

Jan 6, 2009

My website is under ddos attack from some competitors. I don't know yet how big is the attack. The ips of the ddos attack come from all the world.

I have contacted a few hosting companies specialised in ddos proof hosting, unfortunatly the price is so expensive that i cannot afford it.

So i try to find another solution : my website is only aimed to the french people, so maybe is it possible to install a kind of firewall or proxy located before the server to block all the incoming IP adress not from france ? Do you know some websites who can do this and the price ?

I already try do deny the non-french ip in one htaccess file but the ddos attack saturate the server anyway.

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DDOS Attack

Oct 5, 2007

I am seeing DDOs from past two days, I believe its, but I can't find out which type of ddos it is...Whenever I shutdown apache the load goes down, if I start apache the iowait time goes extremely high and after few minutes the server is not responsive...the server is dual cpu quard core...please help me in finding out wuts happening, the softlayer guy is looking into the issue, but I am not getting any good response

I am attaching someoutputs

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What Is Ddos Attack

Apr 16, 2007

what is ddos attack? and also tell me how avoid it

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DDOS ATTACk

Feb 4, 2007

Is there is any easy way to check ip's of attackers so that i can block these ip's ? And how can we know that our server is under DDOS attack?

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What To Do During/after A DDoS Attack

Jul 31, 2007

Yesterday my server suffered a DDoS attack - at least, I'm assuming that's what it was, as incoming traffic rose to 100mb/s for a period of about 20 minutes. The only solution was to shut the server down, then bring it back. Fortunately, the traffic did not return.

At the time, I couldn't even access the server as root. The datacenter has been unhelpful, telling me that they have no idea where the traffic was coming from. What can I do to find out what happened, ideally an IP (and what kind of data was being sent)? I'm running RedHat Enterprise Linux.

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Am I Under A Ddos Attack

Jun 23, 2007

my server is dead from thursday night the site has gone offline well the backend works justwhen you go to a domain it just doesnt open ive run a few commands in ssh heres the results


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

1 127.0.0.1
1 161.73.47.29
1 172.207.11.104
1 172.213.230.64
1 189.162.62.188
1 205.170.14.231
1 62.31.34.193
1 66.183.25.95
1 68.95.129.213
1 70.127.239.110
1 70.156.248.105
1 70.239.23.26
1 71.145.144.82
1 71.176.172.112
1 72.12.175.0
1 72.16.16.81
1 72.179.136.204
1 72.229.122.44
1 74.12.147.227
1 74.38.138.59
1 74.75.91.211
1 76.174.236.193
1 77.98.28.210
1 82.17.236.239
1 84.102.105.171
1 84.13.141.37
1 86.153.107.205
1 86.21.4.170
1 87.192.88.25
1 87.254.65.147
1 88.88.121.139
1 89.122.152.251
2 203.199.163.35
2 206.75.58.188
2 24.162.0.146
2 83.105.66.179
2 85.16.175.211
2 85.30.137.171
4 152.78.254.85
5 70.47.36.6
25 85.17.170.205
37 0.0.0.0
138

i ran netstat -an | grep -c SYN and i get

20
well it varies sometimes higher sometimes lower

i ran netstat -ntp and get

tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:86.153.107.:4185 CLOSE_WAIT -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:77.98.28.21:3278 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:38766 FIN_WAIT1 -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:71.197.174.:2104 ESTABLISHED-
tcp6 70 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39522 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:38754 FIN_WAIT1 -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:76.170.60.:61830 CLOSE_WAIT -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:74.12.147.:64785 FIN_WAIT2 -
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:76.170.60.:61825 LAST_ACK -
tcp6 526 0 ::ffff:85.17.170.205:80 ::ffff:203.199.16:20499 ESTABLISHED-
tcp6 448 0 ::ffff:85.17.170.205:80 ::ffff:82.31.72.23:3554 ESTABLISHED-
tcp6 66 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39504 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:71.130.170.:4683 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:88.88.121.:63217 LAST_ACK -
tcp6 264 0 ::ffff:85.17.170.205:80 ::ffff:77.98.28.21:3316 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:38731 FIN_WAIT1 -
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:172.203.4.1:1573 FIN_WAIT1 -
tcp6 265 0 ::ffff:85.17.170.205:80 ::ffff:77.98.28.21:3300 CLOSE_WAIT -
tcp6 528 0 ::ffff:85.17.170.205:80 ::ffff:206.75.58.1:1529 CLOSE_WAIT -
tcp6 329 0 ::ffff:85.17.170.205:80 ::ffff:152.78.254:24785 CLOSE_WAIT -
tcp6 69 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52294 CLOSE_WAIT -
tcp6 481 0 ::ffff:85.17.170.205:80 ::ffff:172.207.105:3623 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:24.98.106.5:1793 TIME_WAIT -
tcp6 73 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52296 CLOSE_WAIT -
tcp6 481 0 ::ffff:85.17.170.205:80 ::ffff:172.207.105:3625 ESTABLISHED-
tcp6 280 0 ::ffff:85.17.170.205:80 ::ffff:70.156.248:50993 CLOSE_WAIT -
tcp6 256 0 ::ffff:85.17.170.205:80 ::ffff:74.232.21.:50973 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52304 ESTABLISHED-
tcp6 72 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52305 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52306 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52307 ESTABLISHED-
tcp6 446 0 ::ffff:85.17.170.205:80 ::ffff:89.122.152.:3387 CLOSE_WAIT -
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52308 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52309 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52310 ESTABLISHED-
tcp6 447 0 ::ffff:85.17.170.205:80 ::ffff:74.103.15.:50618 CLOSE_WAIT -
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52311 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52312 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52313 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52314 ESTABLISHED-
tcp6 72 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52315 ESTABLISHED-
tcp6 66 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52316 ESTABLISHED-
tcp6 712 0 ::ffff:85.17.170.205:80 ::ffff:195.93.21.:41217 CLOSE_WAIT -
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:52317 ESTABLISHED-
tcp6 712 0 ::ffff:85.17.170.205:80 ::ffff:195.93.21.:45571 CLOSE_WAIT -
tcp6 279 0 ::ffff:85.17.170.205:80 ::ffff:82.45.205.6:2251 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:38243 FIN_WAIT1 -
tcp6 540 0 ::ffff:85.17.170.205:80 ::ffff:82.19.190.2:3929 ESTABLISHED-
tcp6 493 0 ::ffff:85.17.170.205:80 ::ffff:86.21.4.170:4267 ESTABLISHED-
tcp6 712 0 ::ffff:85.17.170.205:80 ::ffff:195.93.21.:57914 CLOSE_WAIT -
tcp6 67 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39453 CLOSE_WAIT -
tcp6 632 0 ::ffff:85.17.170.205:80 ::ffff:75.46.61.3:61728 ESTABLISHED-
tcp6 332 0 ::ffff:85.17.170.205:80 ::ffff:84.108.80.:49283 ESTABLISHED-
tcp6 444 0 ::ffff:85.17.170.205:80 ::ffff:67.163.63.:39467 ESTABLISHED-
tcp6 498 0 ::ffff:85.17.170.205:80 ::ffff:85.30.137.1:2851 ESTABLISHED-
tcp6 444 0 ::ffff:85.17.170.205:80 ::ffff:67.163.63.:39469 ESTABLISHED-
tcp6 508 0 ::ffff:85.17.170.205:80 ::ffff:88.149.100:15418 CLOSE_WAIT -
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:47216 ESTABLISHED-
tcp6 508 0 ::ffff:85.17.170.205:80 ::ffff:88.149.100:15419 CLOSE_WAIT -
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:47217 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:72.83.170.:50089 CLOSE_WAIT -
tcp6 508 0 ::ffff:85.17.170.205:80 ::ffff:88.149.100:15416 CLOSE_WAIT -
tcp6 72 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:47218 ESTABLISHED-
tcp6 68 0 ::ffff:85.17.170.205:80 ::ffff:85.17.170.:47219 ESTABLISHED-
tcp6 1 0 ::ffff:85.17.170.205:80 ::ffff:72.83.170.:50091 CLOSE_WAIT -
tcp6 507 0 ::ffff:85.17.170.205:80 ::ffff:88.149.100:15420 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:82.32.18.24:2244 ESTABLISHED-
tcp6 409 0 ::ffff:85.17.170.205:80 ::ffff:70.239.23.:26082 CLOSE_WAIT -
tcp6 329 0 ::ffff:85.17.170.205:80 ::ffff:152.78.254:24810 CLOSE_WAIT -
tcp6 508 0 ::ffff:85.17.170.205:80 ::ffff:88.149.100:15415 CLOSE_WAIT -
tcp6 715 0 ::ffff:85.17.170.205:80 ::ffff:195.93.20.:42065 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:72.83.170.:50087 CLOSE_WAIT -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:85.30.137.1:2764 ESTABLISHED-
tcp6 505 0 ::ffff:85.17.170.205:80 ::ffff:194.247.231:2269 ESTABLISHED-
tcp6 351 0 ::ffff:85.17.170.205:80 ::ffff:76.174.236.:1645 ESTABLISHED-
tcp6 66 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39649 ESTABLISHED-
tcp6 349 0 ::ffff:85.17.170.205:80 ::ffff:76.174.236.:1646 ESTABLISHED-
tcp6 272 0 ::ffff:85.17.170.205:80 ::ffff:68.95.129.2:4578 CLOSE_WAIT -
tcp6 255 0 ::ffff:85.17.170.205:80 ::ffff:66.249.70.:63667 ESTABLISHED-
tcp6 322 0 ::ffff:85.17.170.205:80 ::ffff:71.99.33.1:50724 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39385 ESTABLISHED-
tcp6 493 0 ::ffff:85.17.170.205:80 ::ffff:172.209.126:4691 ESTABLISHED-
tcp6 506 0 ::ffff:85.17.170.205:80 ::ffff:66.183.25.9:2614 CLOSE_WAIT -
tcp6 444 0 ::ffff:85.17.170.205:80 ::ffff:67.163.63.:39415 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:68.10.147.6:3428 CLOSE_WAIT -
tcp6 487 0 ::ffff:85.17.170.205:80 ::ffff:189.162.62.:1262 CLOSE_WAIT -
tcp6 537 0 ::ffff:85.17.170.205:80 ::ffff:76.195.5.18:4785 ESTABLISHED-
tcp6 270 0 ::ffff:85.17.170.205:80 ::ffff:209.242.13:61937 ESTABLISHED-
tcp6 468 0 ::ffff:85.17.170.205:80 ::ffff:86.4.211.20:4516 CLOSE_WAIT -
tcp6 715 0 ::ffff:85.17.170.205:80 ::ffff:195.93.20.:37092 ESTABLISHED-
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:69.181.177:31392 LAST_ACK -
tcp6 268 0 ::ffff:85.17.170.205:80 ::ffff:74.38.138.:61485 ESTABLISHED-
tcp6 712 0 ::ffff:85.17.170.205:80 ::ffff:195.93.21.:52368 CLOSE_WAIT -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39350 ESTABLISHED-
tcp6 267 0 ::ffff:85.17.170.205:80 ::ffff:87.80.122.1:3587 ESTABLISHED-
tcp6 391 0 ::ffff:85.17.170.205:80 ::ffff:72.83.170.:50185 CLOSE_WAIT -
tcp6 411 0 ::ffff:85.17.170.205:80 ::ffff:81.96.122.1:1457 CLOSE_WAIT -
tcp6 66 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39596 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:74.12.147.:64733 TIME_WAIT -
tcp6 0 1 ::ffff:85.17.170.205:80 ::ffff:88.88.121.:63243 LAST_ACK -
tcp6 339 0 ::ffff:85.17.170.205:80 ::ffff:82.17.236.:50364 CLOSE_WAIT -
tcp6 0 15572 ::ffff:85.17.170.205:22 ::ffff:81.96.122.1:1209 ESTABLISHED-
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:12.201.30.3:3928 CLOSE_WAIT -
tcp6 333 0 ::ffff:85.17.170.205:80 ::ffff:203.199.16:20205 CLOSE_WAIT -
tcp6 0 0 ::ffff:85.17.170.205:80 ::ffff:72.153.122:50891 ESTABLISHED-
tcp6 624 0 ::ffff:85.17.170.205:80 ::ffff:156.34.51.:60779 ESTABLISHED-
tcp6 278 0 ::ffff:85.17.170.205:80 ::ffff:68.227.184:53069 CLOSE_WAIT -
tcp6 716 0 ::ffff:85.17.170.205:80 ::ffff:195.93.20.:54730 CLOSE_WAIT -
tcp6 460 0 ::ffff:85.17.170.205:80 ::ffff:88.88.121.:63284 ESTABLISHED-
tcp6 896 0 ::ffff:85.17.170.205:80 ::ffff:72.95.3.16:50553 ESTABLISHED-
tcp6 66 0 ::ffff:85.17.170.205:80 ::ffff:70.47.36.6:39564 ESTABLISHED-

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DDos Attack

Jan 2, 2007

We are getting more traffic to one of the servers. It seems like DDOS attack, but IPs are diferent. I want to find what IPs are connecting more connections. Are there any commnds? I want to block those IPs.

netstat -rn | grep :80 |wc -l
502

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DDos Attack

Feb 7, 2007

My hosting account has been suspended because of a DDos Attack. What is that

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DDoS Attack Advice

Aug 31, 2009

I have been in online business for about 5 years, but only this morning found out what DDoS is. Shame on me.

Our site was attacked this morning and the host (shared hosting) has switched off the dns connection so our site is currently down along with email. We are a small firm and we are absolutely getting killed by this right now.

The tech support in this hosting company (icdsoft com) is absolutely phenomenal based on previous experiences and here is what they said throughout the day:

"Your site gets approximately 60 hits/second. Unfortunately there isn't much that can be done in such situation. We already blocked the most active IP addresses in our firewall, but this does not help, as the attack comes from many sources "

About an hour later they tried again and the following was said:

"Unfortunately we do not know how long this attack will last. At the moment there are more than 1100 requests/second towards your site."

about an hour after that the following was said:

"The attack is still going on. Currently, the incoming rate is 8MBit/sec. We will enable your site, and we will notify you when the attack is over."

My questions are the following and I will appreciate any advise as I am absolutely clueless about this:

1. What should I do at this point? Should I move the site to a dedicated server and if so, will this solve the DDOS problem?

2. Should I purchase anti DDoS package? They are extremely expensive it appears.

3. If I move to a new dedicated host, which one should i choose? we are a small site, with about 10,000 uniques per month and do not have massive budget so cost is a big factor.

4. How long will this current attack likely last? I know it's impossible to answer, but approximately how long do these things last and is it likely to repeat in the future if we leave things alone?

Any knowledgable advice on this matter will be greatly appreciated as we are hurting badly due to this and even 1 day loss of income for us is extremely serious and hurtful.

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DDOS Attack Poundhost

May 12, 2009

Im currently with poundhost
i have some colo servers with them

they have gone down 3 times over the last week
2 DDOS attacks and 1 router/exchange issue

I called them up and they reckon they get 1 DDOS some weeks, and other weeks have none

However, when another server is getting a DDOS attack, i dont want my server to go down.
I take it the network pipe is being flooded, and thats why websites stop responding.?

so i called rapid switch, they reckon if they get a DDOS attack, it just takes down the one server, and not everyones elses

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DDoS Attack By Wget

May 24, 2009

i have been under DDoS attacks, and what it does is it will have different servers wget

a certain file so it's all pretty much with HTTP.

for example: i had 10000 wget site.com/file.rar from ip x.x.x.x

and then same wget from ip y.y.y.y.

now question is how could i block this?

is it a way on apache2 to limit Downloads per IP (example 1 gb /IP)?

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Under A Ddos Attack- How To Proceed

Nov 6, 2009

I have a dedicated server running Debian and i am having some problems with Apache using a lot of CPU causing the load to go about 100.00. My load is usually 0.50 so this is not a bad coded script that is causing the problem.

I run netstat and got the following results ( my server IP has been replaced ):

Code:

# netstat -ntu
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 66.66.66.66:80 83.149.104.60:46866 SYN_RECV
tcp 0 0 66.66.66.66:80 216.176.179.82:33062 SYN_RECV
tcp 239 0 66.66.66.66:80 216.176.179.82:49383 CLOSE_WAIT
tcp 228 0 66.66.66.66:80 216.176.179.82:48866 CLOSE_WAIT
tcp 228 0 66.66.66.66:80 216.176.179.82:49385 CLOSE_WAIT
tcp 228 0 66.66.66.66:80 78.159.196.25:33786 CLOSE_WAIT
tcp 229 0 66.66.66.66:80 216.176.179.82:49912 CLOSE_WAIT
tcp 845 0 66.66.66.66:80 200.140.141.66:47575 CLOSE_WAIT
tcp 239 0 66.66.66.66:80 216.176.179.82:48835 CLOSE_WAIT
tcp 229 0 66.66.66.66:80 69.22.166.25:33838 CLOSE_WAIT
tcp 239 0 66.66.66.66:80 69.22.166.25:34092 CLOSE_WAIT
tcp 238 0 66.66.66.66:80 216.176.179.82:49056 CLOSE_WAIT
tcp 239 0 66.66.66.66:80 85.234.152.91:49110 CLOSE_WAIT
tcp 229 0 66.66.66.66:80 69.22.166.25:60500 CLOSE_WAIT
tcp 228 0 66.66.66.66:80 216.176.179.82:48575 CLOSE_WAIT
tcp 238 0 66.66.66.66:80 85.234.152.91:49346 CLOSE_WAIT
tcp 229 0 66.66.66.66:80 216.176.179.82:49337 CLOSE_WAIT
tcp 228 0 66.66.66.66:80 69.22.166.25:34173 CLOSE_WAIT
tcp 229 0 66.66.66.66:80 78.159.196.25:33426 CLOSE_WAIT
tcp 239 0 66.66.66.66:80 69.22.166.25:34931 CLOSE_WAIT
tcp 239 0 66.66.66.66:80 78.159.196.25:51062 CLOSE_WAIT

The problem is probably those close_wait connections. I already have APF installed on my server ( althought it doesn't work well with Debian ) and only port 80 is open.

how can i stop those attacks? Besides manually blocking the ip, which is not the best way to handle this problem.

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is there any proved method to determine what kind of attack you are under? Our server has been under attack for more than a day now but so far we have not been able to find out what kind of attack it is exactly. The server maintence company we are using says it's a DDoS attack but they don't say how they found this out. Also, they are not telling us what kind of DDoS attack it is.

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i have installed and configured fail2ban but it has yielded no results
the server surchauffe and be DOWN always...

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Aug 4, 2008

My site was recently under a DDoS attack and was down for a few days, the attack came from Russia i believe.

The people who did it asked for $800, but of course i didnt pay. My hosting company did the best they could in order to stop the attack but it still lasted a few days and badly hurt my rankings.

I moved my site to a dedicated server, but i dont know what kind of software/hardware i need to install on it in order to prevent more future attacks, the hosting company suggested a few things but i dont know if they are just trying to get more money out of me.

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I hope liquidweb can do something about this. This is the first time Im getting DDOS. Its been almost 1hour & counting....hopefully this does not last too long.
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"This ticket is to notify you that it was necessary for us to null route
69.16.xxx.xx due to a very large inbound DDoS attack. The null route was
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If your website gets targeted by an attacker.

And it gets unbelievable volume of attack that brings it down.

You try to shift between hosts but it does not help.

The host would null-rout your traffic to maintain the integrity of his network.

What can you so?

You tried several technical solutions, it did not help.

Someone is determined to bring you down!

Is there any legal path that you can take?

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