Category Archives: Network

Virtual Desktop Infrastructure (VDI) with Ubuntu Linux

Looking to implement Virtual Desktop Infrastructure (VDI) with Ubuntu Linux?

Virtual Desktop Infrastructure with Ubuntu Linux is ideal for anyone concerned about the safety of the VDI-based WAN. It is also ideal for organizations host their applications in the cloud, the use of software-as-a-service through a Web browser. Ubuntu Linux VDI eliminates maintenance of office equipment, and reduces the number of hard disk drives equipment footprint.

Linux Terminal Server Project (LTSP) enables the deployment of centralized virtual desktops over a LAN. Virtual desktop devices (thin clients) are connected to a LAN switch that connects to a server or group of servers that provide a desktop environment and applications.

LTSP is included in Ubuntu 11.04 and earlier versions. The logical choice is the deployment of Ubuntu 10.04, an LTS version. LTS means long-term support, which provides three years of security updates and maintenance.

Low Cost with Ubuntu Linux VDI

With LTSP organizations can recycle old desktop PC (800 MHz, 256 MB RAM) or implement new small footprint and energy efficiency of thin clients. The right size quad-core server can power up to 50 thin clients, providing desktop environments, a relatively low cost. The cost savings are more noticeable in the maintenance and security in recent years. Desktop hardware upgrade cycles between 7 and 10 years, thanks to the absence of turning the hard drive in each unit office. Backups take place only in the server room. Replace the desktop device is as simple as passing and power (unless you are sure customizations).

Better access to remote Windows 2008 with Terminal Services

Terminal Services has been greatly improved in Windows 2008 from Windows 2003, the addition of features for the single sign-on, remote viewing options better, reduce administrative complexity, access to the Web, and Plug-device redirection n-play. These services allow two hosting companies and their customers to more easily control remote services and provide remote users a smoother experience by increasing speed, reducing the need for multiple logins, and provide a screen cleaner.

Remote access from anywhere
Windows 2008 allows users to access standard Windows Best Windows-based programs from anywhere by using RemoteApp and Remote Desktop Connection (RDC). RemoteApp allows users work with applications like asset in person at the remote computer, while maintaining a presence on the computer that has access to the license, you can minimize and maximize the remote control window. RemoteApp reduces complexity and administrative overhead. Offices, hotel employees, support staff, and multi-version application deployments can benefit from this feature.

A better view
Windows 2008 Terminal Services adds support for reporting higher resolution, up to 4096 x 2048, providing support for the poster of the past. It also offers the possibility of using multiple monitors, which covers a multi-monitor screen using a remote connection. Font smoothing is another aspect of the screen better. Windows 2008 supports ClearType, a technology that creates a more seamless experience for the remote user, allowing the fonts appear more clearly, especially on a LCD monitor. Above all, Windows 2008 Terminal Server has priority data visualization, which automatically gives priority to remote users to the screen, keyboard controls and mouse in the other traffic, such as printing and file transfer, that requires bandwidth continues to offer a good user experience.

Cisco CCNA / CCNP Home Lab Tutorial: The 2520 Router

I know from experience that some of the excitement and anxiety of making your own CCNA / CCNP home lab is deciding what to buy! While you can make a viable home lab almost any combination of Cisco routers and switches, some routers are better suited for home lab work than others because they can fill multiple roles.

My favorite is the Cisco 2520. This router has four serial interfaces, making it ideal relay switch. Remember that just because you use a router as a change of image, you can use its routing capabilities. A configuration that I use is the use of three of the four serial ports for switching network framework and point of interface with another quarter-point router. All you need is a DTE / DCE cables and you’re all set.

The 2520 also comes with an Ethernet interface and an ISDN interface, so it gives you even more options. Even if you plan to use ISDN in your home lab right now, you can choose to do so in the future – and with a 2520, you have the router right to do so. Note that if you are going to run ISDN in your home lab, you need an ISDN device such as an ISDN simulator in his laboratory. (ISDN simulators are physical devices and are abundant on eBay – who are not related to “router simulators”.)

The benefits of Integrated Services Digital Network (ISDN)

The advantage of using ISDN to connect to the Internet is much higher compared to using the telephone instead of the old service and Internet service provider (ISP). Dial ISDN, you can almost believe that you are using a broadband connection is also fast. When using an Internet connection with high speed such, a number of additional things you can do with it. Some of the advantages of using ISDN dial-up include:


Multiple digital channels means you can compress all strings and reaching a bandwidth of up to 128 kb / s. This is due to two B channels every 64 kb / s, respectively. With a large bandwidth, allows many things that previously were not available for normal modems, some of these include:

Faster connections, the place, without a number or compromised.
ISDN is also good for gaming due to faster connections.
Video conferencing and streaming takes place without any disturbance.
Videoconferencing can also include multiple recipients.


In the past, you need a phone line for each device used, including telephone service, fax, computer and video conferencing. With the advent of ISDN, everything has changed. Provide other functions such as:

Rackmount Monitor: reduce costs and investment in additional equipment

A display device attached to sturdy metal shelves and are typically used in industrial or commercial environments is known as an exhibitor. This device is mounted on a steel frame chassis and aluminum with regularly spaced holes that bind to the corresponding holes in the steel bars in the rack. This allows the equipment to be attached to the grill. These monitors rack is available in several sizes, such as 1U, 6U, 7U, 8U and 9U LCD, shallow or flat panel LCD display or sunlight readable. The LCD surface depth is 18.9 “deep and is made to adapt to environments smaller than the normal depth rack server.

Operating in the Plug and play, these devices do not require drivers or additional software of this type. Screen sizes Bay widescreen LCD from17 “, 19” and 20 “Samsung LCD and VGA video support, HDMI, DVI-D, composite, S-Video, BNC, HDMI and touch screen (resistive capacitive and infrared). resolutions of 1024×768 up to 1600×1200 range. These units are equipped with a lock-out rails to prevent movement of the keyboard. Some of these devices also have additional safety features as front access locks.

Several models of these devices in a rack to serve different purposes. The quad screen LCD is a perfect choice for monitoring, allowing you to view four video inputs simultaneously one screen. Available in two versions, 4:3 and 16:9 video resolution, this unit has screen sizes ranging from 17 “to 22”. Screens sunlight readable LCD rack are designed so that the video can be seen clearly, even in lighting conditions outside. Compatible with IBM, HP, Dell, Sun Microsystems and others, these devices have a brightness of 1000 cd/m2.

The importance of Green IT

A computer is a new trend, where companies try to achieve business growth is necessary, without damaging the environment. It benefits the environment that companies take care of the disposal of electronic waste effectively to the environment is not affected. In today’s world, people take note of the importance of green technology and how it helps the planet. Consumers and companies associated with the green background with a better brand value.

What exactly is Green Computing?
The study and practice of using electronic resources effectively. Through this practice, the adverse effects of electronics on the environment can be minimized. Promotes the efficient production, use and disposal of electronic components. The following are some of the objectives:

• maximize energy efficiency

• Focus on recycling

• Reduction of hazardous materials

Why is it important to e-waste?
A major problem in the world today is the increased amount of electronic waste. Electronic waste is more than 70% of all hazardous waste. The manufacture of computer parts involves the use of some of the many toxic materials, harmful chemicals, heavy metals, plastics that can not burn easily. These materials, when burned, can contaminate groundwater and the environment.

Junction Box, Switch, two or lunch box – the box should be used?

These are all different types of electrical boxes (except lunch, of course). The location and type of cabling that is taken will determine which type of box used. Lunch will be used after the job is done. Before entering into certain types of boxes, let’s review some of the things that are applicable to all types of electrical boxes.

* All electrical connections must be contained in an electrical box. The box shields the building material and other flammable materials in the case of electrical sparks.

* All boxes must be accessible. Never cover a box with plaster wall coverings, paneling or other.

* If an electrical junction box is spliced ??and the only son of a device such as a switch, should be covered with a white cap.

* An electrical box should be installed flush with the front edge of the finished surface of the wall or ceiling. If the space between the finished surface and the edge of the box is greater than 1 / 8 “and an extension of the box should be installed.

* Make sure your box is deep enough to avoid overloading the child. It should be deep enough for a switch or can be installed easily without crimping or damage to the child. Electrical codes to determine how the son of what size each size of box can accommodate based on the cc capacity of the box. For example, a # 14 wire occupies 2 cubic inches and a # 12 wire occupies 2.25 cubic inches. During the child count, the count of the device or device such as a cable. It is always safer to use a large box unless you have no place in the wall or ceiling.

Electrical boxes come in different materials and shapes. By becoming familiar with different types of boxes, which will be able to select the box next to your project home wiring.


Inside the boxes are usually plastic or metal.


* Electrical plastic boxes are the most widely used boxes for indoor residential wiring. They are cheap and easy to install. However, since you can not be the basis of a plastic box, so some local codes do not permit or only allowed for certain uses. Check with your local building department before using a plastic box.

* Some plastic boxes have holes W / TABS round. These boxes have not been integrated clamps so the cable is held in place by the box. You must use tweezers and basic cable within 8 inches of the box if you use this type of box.

* Plastic boxes are easier to damage than metal boxes, to buy extra boxes just in case. Never install a broken box.

* Most are brittle, not used in those who are not integrated into the wall. The exception is an outer box of extra strong PVC.

* Do not use with large lamps and fans. Some plastic containers are nails anchoring the box picture frames.


* Cans power is stronger and provide a connection to the soil more plastic boxes.

* The cans should be based on the grounding circuit. Connect the earth circuit of the child in the box with a green wire nuts and wire braids or a clip on the floor.

* The cable entering a metal box should be blocked.

* “Offense” boxes can be dismantled and ganged together to give rise to two or more devices.


* It is sometimes called old job or cut into squares.

* Remodel electrical boxes are used when running cable to install new equipment in an old wall.

* Plastic remodel boxes have “wings” and metal cans have clips or the shape of the ears that hold the wall extensible folding.

Outdoor boxes are usually molded plastic and aluminum smelting.

Molded Plastic:

* These boxes are used with PVC conduit in outdoor wiring and exposed wiring inside.

Cast aluminum:

* These are required for outdoor installations connected with a metal conduit.

* They have sealed seams and threaded openings to keep moisture.


Rectangular (2 “X3”) The name “One-Gang”

* These fields are used for switches and sockets.

* A bunch of boxes may have detachable sides that allow them two pictures together to form bands.

Squares (4 “x 4”) The name “Four-Square”

* “Plaster Rings” are used as adapters to accommodate the following configurations: a single band, gang of two or three inches around four inches.

* When a square box is used only for splicing cables, called an electrical junction box and a white cap should be used.

Name octagonal “Three-0”:

* Contain wiring connections of ceiling lights.

* Some octagonal electrical boxes have extendable braces to fit any space between the joists and are nailed or screwed to the frames.

While selecting the appropriate box for your electrical project will help ensure the success of their wiring, electricity, and always follow safety precautions. Never work on live circuits. Before starting work, the circuit must be identified and turned off the sign, marking, so that others know that work is done in this circuit. Confirm that the computer is turned off with a voltage tester. Electrical work must be performed by a confident, experienced or a licensed electrical contractor.

More information on electrical boxes can be found in section Ask the junction boxes

Rongey Dave is a licensed electrical contractor with over 35 years of experience. It is also an avid Do It Yourself. Over the years Dave has seen many DIY projects that caught fire and security. Visit Dave at Ask The Electrician for electrical project guides with photos, allowing you to enhance the beauty and value of your home safely.

How to solve “The RPC server is unavailable” easily

Have you ever met the error message: “The RPC server is unavailable”? Despite a common misconception, most users do not know what it is and how to correct it. RPC is a term that stands for remote procedure call. Acts as a liaison between the system and the server.

“The RPC server is unavailable” error message when the computer can not connect to the server. Various causes can lead to this error, virus attack, firewall, proxy settings and recording defects.

Once the computer displays the error message, make sure the firewall settings are disabled in some firewalls may prevent communication between the computer and the server. The link may be broken by anti-virus security installed on it. Just turn off the security installation and see if it makes a change.

Another thing to consider is whether the tunnel DCOM is enabled. To enable DCOM tunnel, go to Start, then Run. Write DCOMCNFG and click Component Services. Component Services, go to My Computer and select Properties. After that, turn to the Default Properties tab, then enable DCOM. Once you’ve done that, go to tunnel TCP / IP and click “Upload” and bring it to the top of the list. Once done, restart the computer and see that “The RPC server is unavailable” is resolved.

What is the Routing Switch, and when should you use?

Recently routers and switches used as devices for complete independence. But technology is constantly advancing, and more room requirements. Therefore we can see a trend to the functionality of these two devices into one.

First, look at the idea of ??Layer 3 switching. With the rapid development of technology had not appeared at the request of the device, which can combine high performance switching and “intelligence” of the router. It was inefficient to implement router in the topology of the network routing is required, but its use was rare. On the other hand, the routers use routing protocols to high-level results in poor performance and high consumption of resources. Considering these aspects, the decision to design new devices have been approved.

On the mode of application, Layer 3 switching, there are two types of switch router:

Switch Routing.
Changing the router.

In this paper the main features of the route change will be discussed. Routing switch is a switch that operates at the data link layer of the OSI model, but has some improvements for use as a router in the network layer. To determine the shortest path, routing switches based software does not use routing protocols such as RIP or OSPF. On the contrary, they have specialized equipment to implement different research methods and record the routing information. For example, the so-called MLS (multilayer switching) was developed by Cisco to provide multiprotocol data transmission over an ATM network, and this method is used for routing switches. It is important to understand that routing switches are intended to be used only for routing between VLANs (no support WAN).

The main features of Routing Switch:

It has 24 Ethernet ports and does not support WAN interfaces, unlike the routers.
Switches and routes much faster than traditional routers.
Form broadcast domain and act as a switch in the same network.

There are many other specific routing switches. One is a wireless router computer can also function as an access point. In this case, you get literally “three for one”:

an access point for wireless transmission of data.
a switch for connecting computers on a network.
a router for external access.

So when you must use the routing switch?

When you have a network with many machines that produce a large amount of broadcast messages.
When VLAN in the network and you want to improve performance.
When you need the highest level of network security VLAN implementation.
When it is not reasonable to use a standard router due to high costs and poor performance.

Taken and the detector wire with Romex

That can locate a 12 “above the ground. Install your top selling points if you want. Change often go 48” on the ground, but this can vary as needed. We assume that the device is mounted on a surface and is in the center of the room.

Buy 4 “outlet boxes with Romex Romex clamps.” Also buy a “light box is Romex Octagon” with Romex clamps installed. One box contains small Romex staples or clips that will be your anchor Romex cable in the box. They also buy or 14-2 Romex wire 2.12 GT or cable. It comes in 50 feet, 100 feet or even 250-foot rolls. Consider the addition of about twice what you think first you need. I suggest you start your FT 250.

Remove one of the tabs of each Romex boxes so you can slide the cable in the box.

With masking tape, mark a line on the front of each position along the wall where you want the outlets to be anchored. Mark the front of the mother when the switch is going too.

Using 16d nails and hammer box, anchor box comes with two nails on the side of the box and bolt. Add 1 / 2 “to put the box in front of the bar so that you will end up flush with the drywall, usually 1 / 2”.

The anchor light box in a room with 2 x 4 is installed between the joists or trusses. Align so that also sticks for about 1 / 2 “of the beam.

Run a piece of wire Romex box each other and allow approximately 6 – “. Paste for each case of drilling 5 / 8” 8 hole in the center of each post with a little wood, so that can happen Romex through. Also run one of the son of the light switch on the light box in the ceiling.