From: Steve McLaughlin (Steve.McLaughlin@aggreko.co.uk)
Date: Mon Jan 23 2006 - 07:40:01 EST
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.
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