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How Can Check Ddos


How can we be sure that we are facing ddos attacks any good command which will make me 100 percent sure that there is ddos attacks on server ?


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Related Forum Messages:
Check And Prevent Ddos Attack
While working with different issues, I have seen that many clients complaining about ddos attack on their server. So, I am posting here some useful commands to check and prevent ddos attack.

First of all when you see that your site's or server speed is very slow even though there is not much load on your server, you can guess it might be ddos. Then run 'top' command and see which processes is more, if those are httpd then fire following command
which will show how many active connections your server is currently processing.
netstat -n | grep :80 | wc -l
netstat -n | grep :80 | grep SYN |wc -l

The first command will show the number of active connections that are open to your server. The number of active connections from the first command is going to vary widely but if you are much above 500 you are probably having problems.If the second command is over 100 you are having trouble with a syn attack.

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

That will list the IPs taking the most amounts of connections to a server.

use follwoing command to block a ip with iptables on server

iptables -A INPUT 1 -s IPADRESS -j DROP/REJECT

service iptables restart

service iptables save

--------OR---------------
You can place ip's which you want to block in hosts.deny

vi /etc/hosts.deny

httpd: IP

write and quit

---------------------------

Then KILL all httpd connection and restarted httpd service by using following command

killall -KILL httpd

service httpd startssl

-----------------------------------

This are all the step to check and prevent ddos on your server.

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Check And Verify DDOS Attack?
in the last couple of days we really have problem accessing web service, while ftp, ssh, work fine. While we getting connection time out, the load on the server is really load around .2 and get numerous e-mail from Cpanel that httpd is failling and try to restart.

How can i do to check and verify that there a DDOS attack?

What step can i do to possibly minimize DDOS attack?

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Being Ddos'd By A U.K Ddos Protection Company - Dragonara.net
it's come under my attention that dragonara.net has been ddosing me today since morning from the ip:
194.8.75.229

What's so ironic about it is that the ip is from a UK DDOS protection site so i'm expecting some email with their services in the next hour or so. Stay clear of them they are fakes and e-terrorists.

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I would like to know how to check load via ssh and check files causing load?

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I am looking for some good ddos protection providers, via protected dns. I've searched on internet, but most of them are really expensive.

Please tell me some ddos protection providers what could help me.(gige is too expensive btw).

And I found some ddos protection scripts. How can a script protected a server from ddos? A sript like CSF or DDoS deflate?

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Let's say I have a VPS with 512 MBs of RAM.

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But these gave me way more than 512.

Here is the output from my "free -m". Total shows here 3886 MBs of MEM??? That is almost 4 Gigs. Please someone explain this.

total used free shared buffers cached
Mem: 3886 3721 164 0 17 542
-/+ buffers/cache: 3161 724
Swap: 6142 2020 4121

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Nobody Check
Quote:

Nobody Check 1.0.3 Current on cPanel

Tue Mar 20 16:00:02 SGT 2007 on blue.mydomain.com
Server Load: 16:00:02 up 21 days, 14:02, 0 users, load average: 2.73, 2.20, 2.08
Warning: Malicious Nobody Process Found
=========================================
Options: kill bad proc=1 logging lvl=1

SCAN SUMMARY
========================================

Clean Processes: 57
DETECTED Malicious Processes: 1

DETECTION DETAILS
========================================

DETECTION: Process 4221 with name php and path /usr/bin/php

Process ID: 4221 has been killed
Restuls for PID: 4221
total 0
dr-xr-xr-x 3 easyzz easyzz 0 Mar 20 16:00 .
dr-xr-xr-x 291 root root 0 Feb 27 10:01 ..
dr-xr-xr-x 2 easyzz easyzz 0 Mar 20 16:00 attr
-r-------- 1 easyzz easyzz 0 Mar 20 16:00 auxv
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 cmdline
lrwxrwxrwx 1 easyzz easyzz 0 Mar 20 16:00 cwd -> /home/easyzz/public_html
-r-------- 1 easyzz easyzz 0 Mar 20 16:00 environ
lrwxrwxrwx 1 easyzz easyzz 0 Mar 20 16:00 exe -> /usr/bin/php
dr-x------ 2 easyzz easyzz 0 Mar 20 16:00 fd
-rw-r--r-- 1 easyzz easyzz 0 Mar 20 16:00 loginuid
-r-------- 1 easyzz easyzz 0 Mar 20 16:00 maps
-rw------- 1 easyzz easyzz 0 Mar 20 16:00 mem
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 mounts
lrwxrwxrwx 1 easyzz easyzz 0 Mar 20 16:00 root -> /
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 stat
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 statm
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 status
dr-xr-xr-x 3 easyzz easyzz 0 Mar 20 16:00 task
-r--r--r-- 1 easyzz easyzz 0 Mar 20 16:00 wchan

Netstat:

Environ:

Hello, I got this notification from the 'Nobody Check'.

Is there anything I need to be aware of? ..

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confirm this is only 1gig of ram?

Mem: 1034096 985128 48968 0 157944 559136
-/+ buffers/cache: 268048 766048
Swap: 2040212 160 2040052
Total: 3074308 985288 2089020

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Apache Check

Check Apache weak SSL/TLS Ciphers (SSLCipherSuite)

Results

Cipher list []. Due to weaknesses in the SSLv2 cipher you should disable SSLv2 in WHM > Apache Configuration > Global Configuration > SSLCipherSuite > Add -SSLv2 to SSLCipherSuite and/or remove +SSLv2. Do not forget to Save AND then Rebuild Configuration and Restart Apache, otherwise the changes will not take effect in httpd.conf

Can someone explain this in laymen terms? I know this is new in Cpanel. I'm already running Apache 2.2, PHP 5.2.9 with suPHP enabled and mod_security as well (these rules: [url]

Also, what exactly are these CSF checks?

Check csf PT_SKIP_HTTP option
This option disables checking of processes running under apache and can limit false-positives but may then miss running exploits

Check csf SAFECHAINUPDATE option
This option closes a window of opportunity that opens when dynamic chain updates occur

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* username you specified "root" (default is "root")
* password you specified "" (default is "")
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