Hackers Black Book

This is the ultimate book you want to have.

It explains how to learn hacking and cracking multiple networks,
learn to decrypt data in a easy way.

Includes
-----------

- Hacking Into Computer Systems - Beginners
- Maximum Security - A Hacker's Guide to Protecting
- Hackers Survival Guide
- Hacking for Dummies 2
- How to Make Key Generators


Download

http://rapidshare.com/files/43886341/BookBlack.rar

0x80041002 Error while adding host to NLB Cluster

We were getting error 0x80041002 while adding host to a NLB cluster. After making some research I recognised that apart from being a NLB specific error this was related with WMI repositories.

As we started to have this error after a power failure, recreating WMI repositories made sense. In order to fix this error :

- Stop WMI service.
- Move contents of %windir%\system32\wbem\repository to a temp folder (if Windows doesnt allow do this in safe mode)
- Go to command prompt. Under %windir%\system32\webm execute :

mofcomp cimwin32.mof
mofcomp wlbsprov.mof
mofcomp nlbmprov.mof

 - Start the WMI service and try the NLB operation again.

Project Sikuli : Innovative approach to Scripting using image recognition.

Project Sikuli is a new automation scripting language developed by MIT students. This new development environment uses image recognition for processesing. So you can say click on this image on the screen then type this etc.. The syntax look like Python and the IDE is based on Java. So any machine with JRE can run this. I'm really planning to do some server side test case automation based on this new language. If you check the project site even the 0.9.7 release contains lots of features. For more information check :
http://sikuli.org/

For examples (especially the bejeweled bot shows the skills of this new IDE):
http://groups.csail.mit.edu/uid/sikuli/demo.shtml

Windows 2008: Modifying Network Bindings from CLI

Microsoft internals just released a tool called nvsbind. For our mass deployments I was using a powershell script which I wrote in order to change network bindings on specific interfaces (disable IPv6,File and Printer sharing etc..)This really requires lots of effort.(fetching registry hive,modfying it making queries to Inetcfg classes etc..)

With this tool it is now possible to make this via CLI. It can also change NIC binding order for specific protocols.
http://code.msdn.microsoft.com/nvspbind

Parameters are as below:
C:\>nvspbind /?

Hyper-V Network VSP Bind Application 6.1.7690.0.
Copyright (c) Microsoft Corporation. All rights reserved.

Usage: nvspbind [option] [NIC|*] [protocol|*]

Options:
   /n   display NIC information only
   /u   unbind switch protocol from specified nic(s)
   /b   bind switch protocol to specified nic(s)
   /d   disable binding of specified protocol from specified nic(s)
   /e   enable binding of specified protocol to specified nic(s)
   /r   repair bindings on specified nic(s)
   /o   show NIC order for specified protocol
   /+   move specified NIC up in binding order for specified protocol
   /-   move specified NIC down in binding order for specified protocol

Most options are documented in the readme which downloads with the install.
The NIC connection order options (o, + and -) show the NIC connection order, move NICs up and move NICs down

Hyper-V Memory Overcommitment in new Service Pack for Windows 2008 R2

One of the features in Vmware Infrastructre that was missing in Hyper-V was over-provisioning of memory resources which is also known as memory overcommitment. A leaked screenshot from Softpedia shows that the dynamic memory management features is about to be included in the next Windows 2008 build.

http://news.softpedia.com/news/The-Windows-8-Start-Post-RTM-Windows-7-Build-6-1-7700-0-100122-1900-133746.shtml

F5 Big IP LTM Certification

I've been planning to have F5 certification for a long time. Last Tuesday I had a chance to take and pass the fist exam of F5 System Engineering track which is the F50-521 LTM essentials exam. That makes me certified as F5 Product Consultant - Local Traffic Management. 10th IT certification in my museum :)

 As part of NDA I will not go into the details but will give an overview of the exam :
- First of all Student/Instructor guide is not alone sufficient for the exam. You should also take a look on product documentation. The exam is currently covering 9.4 material.
- Apart from the practical side of the devices, you should mostly focus on the theory. I didn't get any lab question like I had in Cisco exams.
- Knowing the theory of NAT/SNAT, iRule, some of the TCL function syntax, VS, Pool and Profile details, redundancy/failover concepts will help you a lot in the exam.
- You will need 76% to pass out of 50 questions. If all questions have the same weight that means you have a chance to make 12 mistakes.

Next week I will also take the F50-522 Advanced exam for the F5 System Engineer certification. Good luck to me ;-)
NOTE : I'm still preparing for the RHCE lab. I will also put updates on the blog about that.

How to test the throughput/performance of your network using Netperf - Part 1

In this multi-part series, I will explain how to use GNU tools and Linux to have a free network throughput test setup. In Part 1 of the series we will use only one NIC to create single unicast TCP/UDP stream to saturate the linkspeed.
First of all what I used to have this test setup (you can adapt it to your needs)

HW :
- 2 HP Blade on same enclosure chassis with 10Gig HP Flex NICs. (servers)
- HP VC Flex 10 (the network device)
Software :- Centos 5.4 x64
- I only installed core GNU packages + development libraries. No unnecessary service/software loaded. Even I took XWindow(Gnome/KDE) out of the package and run the system in rulevel 3.
- Disable Firewall/SELinux
- netperf rpm (ftp://ftp.netperf.org/netperf/netperf-2.4.5.tar.gz)

I made the first run of the test using single Vnet (counterpart of VLANs in HP Virtual Connect). You can also use the same tools to create a setup that utilize Shared Uplink Sets (trunk links on VC). In order to set this up create a Vnet for your load VLAN(Vnet_LOAD). Create the profiles for the blades and assign one FlexNIC with 100Mb to management VNet and the other one to VNet_LOAD (10Gb)

Netperf is based on client server model. After installing the software on both blades you execute different processes on different nodes. netserver as the name states is the server part of the test suite. You can also use the
[root@SERVER ~]# netserver
Starting netserver at port 12865
Starting netserver at hostname 0.0.0.0 port 12865 and family AF_UNSPEC

while netperf is the tool that executes the test and gives output.

[root@CLIENT ~]# netperf -H SERVER -l 15
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET toSERVER (*******) port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec
 87380  16384  16384    15.00    9387.92

The default test is TCP_STREAM you can also define other tests like UDP Request Response to fully saturate Full Duplex Link :

[root@CLIENT ~]# netperf -t UDP_RR -H SERVER -l 15

UDP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to SERVER (*********) port 0 AF_INET

Local /Remote

Socket Size   Request  Resp.   Elapsed  Trans.

Send   Recv   Size     Size    Time     Rate

bytes  Bytes  bytes    bytes   secs.    per sec

129024 129024 1        1       15.00    21045.72

Also you can fetch the CPU utilization info while doing the test using -c (local) and -C(remote) parameters

[root@CLIENT ~]# netperf -t UDP_RR -H SERVER -l 15 -c -C

UDP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to SERVER (*******) port 0 AF_INET

Local /Remote

Socket Size   Request Resp.  Elapsed Trans.   CPU    CPU    S.dem   S.dem

Send   Recv   Size    Size   Time    Rate     local  remote local   remote

bytes  bytes  bytes   bytes  secs.   per sec  % S    % S    us/Tr   us/Tr

129024 129024 1       1      15.00   20964.03   2.06   2.03   15.759  15.481

For detailed documentation and command line options you can check :

http://www.netperf.org/netperf/training/Netperf.html#0.2.2Z141Z1.SUJSTF.8R2DBD.J

On the next parts of the series I will focus on different types of throughput/load tests like multi flow & multi IP throughput testing using netperf & some Linux tweaking and IP multicast testing using MGEN.