How to : Port Security in Cisco switches

Cisco Port security is an important feature to most of my customer. Especially Software development companies and BPOs are the constant customer types asking for this feature to restrict devices connecting to their network.

Cisco Port security is to limit the devices that are connecting to the Wired network via switches. This feature checks for MAC address of the device that has just accessed the switch port and verifies whether that device is allowed to connect wired network or not. The wireless equivalent of this feature is MAC address Authentication. The number of addresses the feature accepts is equivalent to the maximum limit of MAC address of the switch.
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Windows 8 End user training brochure

Windows 8 Logo

Six Months after the Launch of Windows 8 Consumer version, Microsoft has released End user training document for Windows 8. May be Steven Sinofsky thought windows 8 users don’t want a end user manual. But Launch of third party apps like Classic shell, Pokki, IOBitStart8, which is a software to bring back classy start menu back to your windows 8 installation or Boot2Desktop may have melted Microsoft’s vision. MS has started to understand its not good for company to remove much expected features in Windows 8 and of course every software needs a README.DOC (Even Windows 1.1 had it)

This can be downloaded online, Link given below. Its in PDF format, you need a PDF reader to read this (Windows 8 comes with a “Reader” inbuilt)
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Cool tool to get a clear and quick understanding of Cisco commands

Cisco Output interpreter

Cisco Output interpreter

How many times have you been confused by Cisco command output? Have you ever mis-interpreted any information and ran into problems? Have been frustrated about cluttered output of cisco command output in CLI? Ever complained to friends and fellow engineers about clear output format like what other vendors do with web interface. Well most of engineers do. But if you get used to do with CLI commands then its easier for you.For newbie there is a small need. Continue reading

Kickstart Your e-business with clone scripts immediately

You may be aware of website which provides alternative programs and softwares to your favorite softwares. Here is another site but its not for consumers but for entrepreneurs who are starting business.

Script is a script directory site makes available free resource of useful clone scripts to help people develop websites as per their preferred online portal.

When you want to start a business like Facebook you can definitely visit here and get to know about a software that provides almost same functionality of Facebook. One example I have tried is “Kootali” which I tried to one of my client’s project. Its a facebook clone script developed by Agriya infoway. Surprisingly the developer was from Chennai, where I live currently.
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Promosing technologies of Networking industry :: OpenFlow

OpenFlow : Defined
A programmable network flow control protocol that enables software defined networking. That means users can define, direct and manage flows and traffic paths through the network of multi-vendor products. This adds a new layer and separates the OS from hardware. So regardless of what hardware you are using OpenFlow can define program for network flows and paths.

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How to open files with unknown extensions?

Yesterday I was searching for a way to open a new file format that my new by Windows 8 Release Preview don’t understand. Most of you may have come across that situation. In this blog entry I am going to list the various ways to find out a software that can open unknown  file extension.

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Manage packages with yum behind proxy

Today I tried to update a student’s Fedora Core 13 PC and install netbeans via yum at Anna University, Trichy, Where we are doing IP Tele project. But yum fails to retrieve packages from repository. Soon I found the PC is behind a proxy [Squid]. So I did some search over Google and found the below which may be useful to you at times.

Yum try to access the network repositories by using HTTP1.0 protocol by default. The squid we use can provide the HTTP1.0 proxy. So configuring yum to pass through the squid as follows worked.

To configure to a single user.

If you are not a Super user and wants to use yum then set an environment variable http_proxy to direct the yum to use the proxy. You can also set ftp_proxy, socks_proxy variable to use the yum with it. The value for the http proxy is like this http://user:password@host:3128

export http_proxy=”http://karthik:karthik123@″

This will work to the current user only. If you sudo then the proxy setting will be lost.

To configure globally

To configure the yum to use the proxy server login into super user account and edit yum.conf


Then enter the following information.

#Proxy Server address

# Username and password if provided to your server