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How to configure Startup Applications in Linux Mint 12 running Cinnamon


Today I will show you how to configure startup applications in Linux Mint 12 running the Cinnamon desktop.

Go to MenuPreferencesStartup Applications

You will be shown a list of all the programs that are configured to start at boot time. Click on Add.

For the purpose of this tutorial I will configure Libreoffice to start at boot.   In the screen shot above I have configured the following:

Name – Libreoffice

Command – /usr/bin/libreoffice (all programs are stored in /usr/bin so use this command)

Comment – Office Suite

Once configured click Add.

Restart the system and your chosen program with start at boot.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

How to resize an image using GIMP


Imagine the scenario.  You are trying to upload a picture to a website but the picture resolution is too high and the size of the file is also too high.  So what do you do? Today I will show you how to resize an image using GIMP.

GIMP is an open source picture editing and manipulation tool that can be run on Linux, Windows and OS X.  You can take a picture and resize, crop and edit in a thousand different ways to your hearts content.  Think open source Photoshop and you would not be far wrong.

For the purpose of this tutorial I will be using the Linux version of GIMP on Linux Mint 12.  I will be taking a file that has a resolution of 1440 * 900 and size 1.8Mb and reducing it 800*600 and less than 200Kb.

Open up GIMP and go to File – Open to choose your image.  Click on your image and then click open.

So lets sort out the resolution first.  Go to Image – Scale Image to get the screenshot below.

Change the Width value to 800 and the Height value to 600 (hence 800*600 resolution) and click Scale.

Now onto the size of the file.  Go to File – Save As pick a name and location for your image and then click save.  You should then be presented with the box below.

Click the box next to Show preview in image window as this will show you the image size and move the Quality slider left and right until you get the required file size.  So mine would look like:

When you have the required file size click Save and voila your image will now have a resolution of 800*600 and be less than 200Kb in size.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

How to tether your Blackberry Playbook to your Blackberry Phone


Today I will show you how to tether your Blackberry Playbook to your Blackberry phone.  Once completed this will allow you to use your phones 3G connection through your Playbook.

For the purpose of this tutorial I will be using a Blackberry Bold 9780 and a Blackberry Playbook on OS 2.0.1.358.

Ok first step is to turn on bluetooth on both devices.  Now on your Playbook go to Settings – Bluetooth and click on Add New Device.  Once the phone has been found add it.

Now go to Internet Tethering and your phone should appear on the screen under Select a Bluetooth device to tether to. Click on it.

You should be asked to select a wireless service profile for your internet connection. In the search box type in your carrier (mine is vodafone uk) and click add profile.

On the next screen you will be asked for a username and password for access to the internet.  Leave the defaults and click connect.

You will now see some information on tethering charges.  If you already have a data plan with your phone then there will be no extra charges (unless you go over your allowance).  Any data used comes off your monthly data allowance.  Have a read and then press continue.

The system will now authenticate and then you should receive a message : Your tablet is now connected to the internet.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

How to use your Blackberry internet connection through your computer


Today I will show you a handy little tip on how to use your Blackberry internet connection through your computer.  This comes in very handy when you don’t have an internet connection on your desktop PC or laptop but you do have 3G on your phone. Any data you use will come out of your existing phone data plan so you shouldn’t incur any excess charges (unless you go over your data allowance).

For the purpose of this tutorial I will be using a Blackberry Bold 9780Linberry Blackberry Desktop Manager for Linux and Linux Mint 12 but the steps work on all Linux Distributions.  For Windows users you will need to use Blackberry Desktop Software to accomplish the same task.

First thing to do is connect your phone to your computer via its usb cable.  Then we need to download Linberry and install it.

Now we need to click on the ‘Use your Blackberry as a modem to surf the internet” icon (bottom left).

On the next page read the information and then click proceed.

We will now be told that your Blackberry phone needs to be restarted (shown below) so click on Restart my Blackberry

On the follwoing page (shown below) follow the instructions on how to reconnect your Blackberry to the system when it has restarted.

On the next page click Connect.

Your phone will now authenticate with your data carrier and in a minute or so you will be able to access the internet on your computer.

WORD OF WARNING Your mobile data plan is designed for use on your phone.  If you start accessing the internet through your computer you will use up your data allowance a lot quicker than you usually would.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

Tutorial – How to Subnet


Today I will show you a technique I learnt for my Cisco exams on how to subnet and choosing subnet masks.

The best way to explain subnetting is by showing some examples.

Question 1:

If a subnet mask of 255.255.0.0 were used with a Class A network how many subnets and hosts per subnet could exist?

Answer:

The best way to answer this question is to break it down into individual sections.  The sections are:

1. No of Network bits

2. No of Host bits,

3. No of Subnet bits,

4. No of Subnets

5. Hosts per Subnet.

Lets take them one at a time.

No of Network bits = 8 (This is defined by Class A = 8, Class B = 16 and Class C = 24)

No of Host bits = 16 (This is defined by the number of zeros in the subnet mask)

No of Subnet bits = 8 (This is defined by 32 – No of network bits – No of Host bits)

No of Subnets =  256 (This is defined by  2ˆ No of subnet bits)

Hosts per Subnet = 65534 (This is defined by 2ˆNo of Host bits – 2)

So to answer the question  No of subnets = 256 with 65534 hosts per subnet.

Question 2:

Which of the following are valid subnet numbers in network 180.1.0.0 when using mask 255.255.248.0?

a) 180.1.8.0

b) 180.1.4.0

c) 180.1.40.0

Again the best approach is to break the question down into sections.  This time the sections are:

1. Find the Subnet Number

2. Calculate the First address in the range

3. Calculate the Broadcast address

4. Calculate the last address in the range

Lets take them one at a time.

Subnet Number = 180.1.0.0 (This is defined by 256 – 248 = 8 (Subnet Magic Number). 8 *0 = 0 (Interesting Octet) which is the closest multiple <=0 which is the 3rd octet in 180.1.0.0)

First number in the address range = 180.1.0.1 (This is defined by adding 1 to the subnet’s last octet)

Broadcast Address = 180.1.7.255 (This is defined by the Subnet Magic Number (8) + Interesting Octet (0) minus 1

Last address in the range = 180.1.7.254 (This is defined by the broadcast address -1)

So to answer the question the subnet numbers begin with 180.1.0.0 (zero subnet) and then 180.1.8.0, 180.1.16.0 and so on therefore a and c are the correct answers.

I hope that the steps outlined above help when it comes to subnetting your own networks.

About the Author

P1020114

Hi I’m Chris Wakefield the owner of ComTech IT Support. I provide Windows, Mac and Linux based IT Support to small businesses in Stirling, Alloa and Falkirk.

Follow @Comtech247 on Twitter

How to promote a Windows 2008 R2 Server to a Domain Controller


Today I will show you how to promote a Windows 2008 R2 Server to a Domain Controller.

On your Windows 2008 R2 server go to Start and type dcpromo into the search box as shown below.

When the program has been located double click on it to start the wizard.

On the following page read through the Operating System Compatibility warning and then click next.

The wizard will now ask us to Choose a Deployment Configuration.  If the server is already part of a domain then choose Existing Forest.  For the purpose of this tutorial we shall set up a new domain so choose Create a new domain in a new forest.

On the next page of the wizard you are asked to pick a FQDN for your new domain.  Enter a domain of your choice and then click next.

We are now asked to choose the domain functional level.  If your domain is only going to have Windows Server 2008 R2 machines on it then choose Windows Server 2008 R2.  If however you are intending to run systems with Windows Server 2003 in your domain at some point then you will need to choose Windows Server 2003.  WARNING Once the domain functional level has been set at Windows Server 2008 R2 it can’t be reduced.  This means that if your ever needed to add a Windows Server 2003 server to your domain you couldn’t.

 

Will will now be taken to the Additional Domain Controller Options page.  Make sure that the DNS Server option is ticked and then click next.  When a warning appears asking if you want to continue click yes.

On the next page  you are asked to specify locations for the Database, Log and Sysvol folders.  You can either accept the defaults or create your own locations.  Once configured click next.

You will now be asked for a Directory Services Restore Mode Administrator Password. Enter your chosen password twice and then click next.

 

You will now be shown the Summary page.  Review your choices and when happy click next.  Active Directory Domain Services will now be installed onto your server hence promoting it to a Domain Controller.

About the Author

P1020114

Hi I am Chris Wakefield the owner of ComTech IT Support. I provide Windows and Linux based IT Support, laptop repairs and computer repairs to both business and personal clients throughout Stirling, Falkirk and Clackmannanshire.

For a list of what I can offer you why not visit my website www.comtech247.net where you will find a list of my services, testimonials, blog and much more!!

Virtualbox error NS_ERROR_FAILURE (0x80004005)


Virtualbox error NS_ERROR_FAILURE (0x80004005). I came across this error code yesterday when I was trying to import a virtual machine from VMWare into Oracle Virtualbox.

I had successfully converted my Acer Aspire One running Windows 7 Home Premium from a physical machine into a virtual one but I could not import it into Virtualbox because I kept on getting this error message.

It turns out that Virtualbox needed to be run as root for the operation to be successful.  After this the world was once again a nice place to be!!

I hope this helps out someone else.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

 

Cups Server Error ‘client-error-not-possible’


I came across this little beauty yesterday when trying to install a network printer on an Eeepc 701 8G running Lubuntu (really good distro by the way!!).  The netbook could see the printer but was unable to install the driver.

The steps I took to rectify the problem were:

1. I thought it was a driver issue so I reinstalled the hp linux drivers.  This made no difference.

2. I reinstalled CUPS.  Again this made no difference.

3. I then remembered that the printer was shared through Samba.  I had already installed samba onto the Eeepc but I hadn’t installed smbclient. Doh!!  I installed this and the world is good again.

I hope this helps out someone else.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

 

Configuring vlans on a Cisco switch


Today I will show you how to configure vlans on a Cisco switch.  For this tutorial you will need to establish either a console , telnet or ssh session to your switch and use the following commands.

Configuring a new vlan

Comtech1#configure terminal

Comtech1(config)#vlan 2

Comtech1(config-vlan)#name Working-vlan

Comtech1(config-vlan)#exit

 

Now we need to assign ports on the switch to the new vlan

Comtech1(config)#interface range fastethernet 0/13 – 22

Comtech1(config-if)#switchport access vlan 2

Comtech1(config-if)exit

 

Don’t forget to save the configuration!!!

Comtech1#copy running-config startup-config

About the Author

P1020114

Hi I’m Chris Wakefield the owner of ComTech IT Support. I provide Windows, Mac and Linux based IT Support to small businesses in Stirling, Alloa and Falkirk.

Follow @Comtech247 on Twitter

 

How to configure a Cisco switch with an ip address


Today I will continue the Cisco theme and show you how to configure a Cisco switch with an ip address.  For this tutorial you will have to connect to the switch using a console session.

Lets start.

Comtech1#configure terminal

Comtech1(config)#interface vlan 1

Comtech1(config-if)#ip address 192.168.1.199 255.255.255.0

Comtech1(config-if)#no shutdown

Comtech1(config-if)#exit

 

Now we need to set the default gateway:

Comtech1(config)#ip default-gateway 192.168.1.1

Comtech(config)#exit

 

Don’t forget to save the configuration!!!

Comtech1#copy running-config startup-config

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

If you found this blog useful then why not sign up to my RSS Feed for news, tutorials, views and general techie stuff!!

 

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