Dealing With A DDoS Attack

Feb 8, 2008

I've got CSF setup, but the problem is, I can't seem to keep the SYN Attack blocked without blocking all my legit hits.

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Dealing With A Distributed Spam Attack (exim)

May 16, 2007

We've been seeing sluggish performance on our mail gateways, and so I started doing some digging in the logs. It looks like we are filling up with messages like:

2007-05-16 12:22:16 Connection from [xx.xx.xx.xx] refused: too many connections

We have our max connections set to 20 (total, not host-specific) in exim4. So I started tailing the logs, and sure enough, we are getting bombarded with requests to randomstring@ourdomain.com coming from all over the map. The requests are getting denied of course, but that doesn't help the connection issue since they are consuming all of them, preventing real mail (for the most part) from getting through.

What is the proper way to deal with something like this? I could certainly just up the max connections value from 20 to 40 or 50 or whatever, but I'm not sure what kind of performance impact that will have on the rest of the traffic going through our gateways.

Since the spam attempts are coming from all over the place, it doesn't seem like I can just firewall out a few addresses and be done with it.

This particular rack is a cluster of web and database servers behind two gateway boxes, which handle the mail traffic (so this problem is on the gateways, the actual mail server itself sits behind the gateways and never actually sees these fake emails).

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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 :: 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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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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How To Detect A DDoS Attack ...

May 19, 2009

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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Ddos Attack & Pc Zombies

Nov 16, 2008

Ddos attack

This week some hackers attack my site with ddos attack and pc zombies...

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

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What Can I Do To Prevent DDoS Attack

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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DDOS Attack On Liquidweb

Sep 3, 2008

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.
Is there anything they can do proactively to counter this attack. I have a hardware firewall with them also. I was told around 800Mbps of inbound traffic.

"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
required in order to keep our network stable and to limit the affect to our
other customers. We are actively monitoring the situation, and will remove the
null route as soon as the attack has subsided enough.

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Second DDoS Attack - Need Protection

Dec 26, 2008

This is the second time I have been DDoS Attacked and it is losing my customers and my reputation. I personally think it is a rival company trying to put me out of business. So to prevent further attacks I need so protection. Is there some kind of software based protection or is it only hardware?

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Is My Server Under DDOs Attack

Feb 2, 2008

is this DDOs attack : .....

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How To Report A DDoS Attack

Jul 16, 2008

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?

Is there a legitimate hackers company that you can hire to look at the attack and find the source?

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Under Heavy DDoS Attack ...

May 4, 2008

My website (Large Discussion Forums Site) is under a heavy DDoS attack since 3 weeks. My first host could not handle such an attack so I moved to another who claimed to have a firewall that can handle the attack, but still, the site is down.

Anyone has a good suggestion to get the site up and handle the attack? Any particular hosts that can help me?

(The Forum has its own server and does not use Apache).

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DDoS Attack/blackmail

Apr 14, 2008

Your site is now officially being DDoS Attacked. This will render your site completely offline to you, or any of your visitors/customers. Your site will continue to be attacked, and stay offline, until I receive $400.00 USD in Liberty Reserve.

Liberty Reserve Account Number: U5585060
*Payment ensures future protection from DDoS Attacks, finding future attackers, and disabling their botnets.

Valid Contact Email: drjaykrew@gmail.com

I will 100% respond to any emails sent here, so the choice is yours! If I am ignored, you know the consequences.

I laughed of course but when I checked my server... it was down for 8 hours, 18MB log file, over 700 unique IPs.

First I called the colocation... Isn't it the normal thing to do?! Who else can filter/block this attack? Unfortunately it doesn't help at all with Rapid Switch (www.rapidswitch.com - don't expect any support from them) They replied "What do you expect us to do?"

Or the exact answers:

Can you please let us know what kind of assistance you would like from us?

And the last one:
Perhaps you can outline what you think it is feasible for us to do in situations like this?

No comment...

Once I saw that there is no help coming from them, I decided to move the website to a server I got at home: 3.4GHz Dell, 16GB RAM, Windows 2008 Datacenter, behind Linksys RV082 on 12Mbit adsl - perfect! My $300 router could handle the attack, but my ISP cut off port 80 after less than an hour!

So I had to move back to the server I have at the colo (Windows 2003 Enterprise, IIS6). Tried Sygate, Zonealarm and Symantec Endpoint Security - none of them helped.

Here are two lines from the log:

2008-04-14 06:27:49 W3SVC1078447680 <IP> GET /login.php - 80 - 195.56.6.17 Mozilla/4.0+(compatible) 200 0 64

2008-04-14 06:27:49 W3SVC1078447680 <IP> GET /login.php - 80 - 78.3.24.20 Mozilla/4.0+(compatible) 500 0 1236

I have edited the login.php to ignore the requests

PHP Code:

if ( !isset($_SERVER['HTTP_REFERER']) ) { exit; }

It did the job - reduced the myslq queries, but the server is still crashing after 15 minutes and over 1GB incoming traffic.

12 hours later, after trying everything I found on the web - I finally gave up (no, I didn't pay hahaha) and set the nameservers to 127.0.0.1

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Ddos Attack, Been Down For 2 Days

May 24, 2008

Some jerk has been attacking my Windows based server for 2 days. Basically he said he has 600+ bots that connect and look like normal users. The site has been down and we have lost some serious income.

I was thinking about just using GigeServers ProxyShield as I thought it would be the easiest route but the $1000 a month is a bit much.

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What Kind This Attack.. Ddos

Dec 23, 2007

I donno what kind of this attack. Dddos or syn attack?. Every time my apache server down dan cpu load very high because of this.. please help me how to defend attacker like this because when im block that ip in iptables after 3/4 hour it come again with another ip. What must i do?

Many connection like below example IP 60.50.80.51. Just one ip per onetime attack but so many same ip 60.50.80.51 can see when type netstat -anp... Im just paste a few here

tcp 0 0 208.77.102.217:80 60.50.80.51:1202 SYN_RECV -
tcp 0 0 208.77.102.217:80 60.50.80.51:1195 SYN_RECV -
tcp 0 0 208.77.102.217:80 60.50.80.51:1525 SYN_RECV -
tcp 388 0 ::ffff:208.77.102.217:80 ::ffff:60.50.80.51:1771 CLOSE_WAIT -
tcp 0 0 ::ffff:208.77.102.217:80 ::ffff:60.50.80.51:2027 ESTABLISHED -
tcp 0 0 ::ffff:208.77.102.217:80 ::ffff:60.50.80.51:3051 CLOSE_WAIT -

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