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Archives for December 2010

Nikto – vulnerabilities scanner

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Nikto is an Open Source (GPL) web server scanner which scans your webserver against more than 3500 dangerous files/CGIs, outdated version checking, It has a very good plugin support
Official site

To install in ubuntu / debian

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$ apt-get install nikto

For simple test:

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firewall ~ # nikto -h debianuser.org
---------------------------------------------------------------------------
- Nikto 2.02/2.03     -     cirt.net
+ Target IP:       188.40.116.206
+ Target Hostname: debianuser.org
+ Target Port:     80
+ Start Time:      2010-12-07 10:45:55
---------------------------------------------------------------------------
+ Server: Apache
+ OSVDB-3092: GET /img/ : This may be interesting...
+ OSVDB-3268: GET /icons/ : Directory indexing is enabled: /icons
+ 4347 items checked: 2 item(s) reported on remote host
+ End Time:        2010-12-07 10:49:45 (230 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested

Trainig for CCNA 640-802

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Q: What is the purpose of the Spanning Tree Protocol (STP)?
A: prevents Layer 2 loops

Q: What creates a loop-free path through a switch network?
A: Spanning Tree Protocol

Q: Which statement is true regarding states of the IEEE 802.1D Spanning Tree Protocol?
A: Ports listen and learn before going into the forwarding state.

Q: Which industry-wide specification was developed to decrease the time that is needed to move to the forwarding state by switch ports that are operating in a redundantly switched topology?
A: RSTP


Q: Refer to the exhibit. Which switch will be elected the root bridge and which switch will place a port in blocking mode?
A: SW4 will get a port blocked.
A: SW3 will become the root bridge.

[Read more…]

Create Nagios Icons

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Nagios

If you ever tried to make Nagios Status-Map a little nicer by adding some dependencies and some pretty icons, you have probably came across some little collections/packs of icons at NagiosExchange.
But if you need a special one, you must do it by yourself.
And you probably noticed that you need images with .gd2 extension
Here is how to convert a PNG image into .gd2 (GD Graphics Library format)

Solution one:

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aptitude install netpbm
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pngtopnm example.png | pnmtopng -transparent =rgb:00/00/00 2>/dev/null | pngtogd2 /proc/self/fd/0 example.gd2 0 1

Solution two:

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aptitude install libgd-tools
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pngtogd2 phone.png phone.gd2 0