Call the ISP, they can usually isolate it from there...
-----Original Message-----
From: Jorge Alfredo Garcia [mailto:frederix@gmail.com]
Sent: 20 January 2006 18:02
To: pen-test@securityfocus.com; firewalls@securityfocus.com
Subject: DoS problem.
I have two dedicated servers, both hosted by the same provider and
both on the same segmnet.
I am under a denial of services attack but idont know exactaly how to
stop it.
Here is a piece of my netstat output:
tcp 0 1 XX.XX.XX.AA:47561 XX.XX.XX.BB:80
SYN_SENT
tcp 0 1 XX.XX.XX.AA:47562 XX.XX.XX.BB:80
SYN_SENT
tcp 0 1 XX.XX.XX.AA:47565 XX.XX.XX.BB:80
SYN_SENT
tcp 0 1 XX.XX.XX.AA:47564 XX.XX.XX.BB:80
SYN_SENT
tcp 0 1 XX.XX.XX.AA:47567 XX.XX.XX.BB:80
SYN_SENT
Ok, XX.XX.XX.AA is the server i am in now.
XX.XX.XX.BB is mine two and here are the connections:
tcp 0 0 XX.XX.XX.BB:80 XX.XX.XX.AA:50749
SYN_RECV
tcp 0 0 XX.XX.XX.BB:80 XX.XX.XX.AA:50598
SYN_RECV
tcp 0 0 XX.XX.XX.BB:80 XX.XX.XX.AA:50309
SYN_RECV
I have thousands of this connections on both servers.
I make iptables rules in both sites but the attack still running and
the rules dont work.
I cant understand how this attack can be made taking into account that
the attacker isnt inside any of my servers.
Why iptables rules dont work against this?
Thanx in advance.
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
______________________________________________________________________
Visit us at http://www.aggreko.com
Confidentiality Notice: This communication and any accompanying attachments
contain confidential information intended for a specific individual and
purpose. This communication is private and protected by law. If you are not
the intended recipient, you are hereby respectfully notified that any
disclosures, copying, forwarding or distribution, or the taking of any action
based on the contents of this communication is strictly prohibited.
_____________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________
------------------------------------------------------------------------------
Audit your website security with Acunetix Web Vulnerability Scanner:
Hackers are concentrating their efforts on attacking applications on your
website. Up to 75% of cyber attacks are launched on shopping carts, forms,
login pages, dynamic content etc. Firewalls, SSL and locked-down servers are
futile against web application hacking. Check your website for vulnerabilities
to SQL injection, Cross site scripting and other web attacks before hackers do!
Download Trial at:
http://www.securityfocus.com/sponsor/pen-test_050831
-------------------------------------------------------------------------------
