WAN Network Design Options

It’s commonly assumed that the LAN (Local Area Network) and the WAN (Wide Area Network) are completely different animals. You need completely different network design philosophies for each... or do you?

The abyss between WAN and LAN became established by they way they came into being. LAN networks are owned by individuals, businesses and organizations and are based on packet switching. At one time, there were competing topographies such as ring, star and buss. Now it’s all Ethernet on the LAN, with some specialized networks used for such things as disk storage. Most networks are based on twisted pair copper, fiber optic cable, or some combination of the two.

WAN standards grew out of the telephone industry, which has a monopoly on twisted pair telco lines used for both voice and data. Until recently fiber optic networks were also primarily owned by or at least developed to telephone company SONET/SDH standards.

Clearly, there was a technological disconnect between packet switched LAN technology and circuit switched WAN technology. That’s not so much the case anymore, but it is true that you need to do a protocol conversion to connect point to point or to the Internet using telco services such as T1 lines, DS3 bandwidth or OC3 fiber optic connections. Both the circuitry and software needed for WAN network interface are off the shelf items. You simply by a T1 interface card for your router if you want to plug in a T1 line.

What this means is that you can generally mix and match WAN network technologies as long as you have the proper interfaces. T1 line prices have plunged in recent years, making them the entry level WAN option of choice. A T1 line can be used to provide a dedicated broadband connection to the Internet or a direct point to point connection between two business locations. Some companies build customized WAN networks by connecting each branch office back to headquarters using T1 lines to form a star network. The router at headquarters manages traffic between all locations.

What’s new in WAN networking is the rise of Carrier Ethernet and MPLS networks. These are very compatible technologies and can be used together or separately. Carrier Ethernet is a native packet switched technology that avoids LAN/WAN interface issues. You can replace point to point T1 lines with Ethernet line services. Ethernet can also be used to provide a last mile connection to the Internet. Unlike T1, there is an Ethernet LAN service that can be used to connect multiple locations together in a mesh network. Ethernet LAN is a direct replacement for private WAN networks based on T1 lines or higher bandwidth services.

MPLS networks provide a many to many WAN networking solution. MPLS is a protocol that can transport nearly any other protocol in a cloud network. You see T1 lines being used for network access. Ethernet service is also used for last mile network access to the same MPLS networks.

What Carrier Ethernet and MPLS networks offer compared to their telco WAN predecessors is a cost savings and the ability to get out from having to manage the WAN yourself. You can treat Ethernet LAN or MPLS network services as a true cloud that provides the bandwidth, latency and class of service controls you need for converged network operations. Competitive carriers own their core networks completely independent of the telephone companies. In major metropolitan areas, they also provide fiber optic access connections at considerable cost savings over legacy solutions.

What are the best WAN network design options for your company? Why not compare several competing architectures and see which offers the best cost savings for the performance required? Check WAN network solution prices and availability now.



Note: Photo of telecom equipment racks courtesy of Wikimedia Commons.

MPLS Network Services

Wide area networks are almost a utility service for businesses today. You can’t get much done without broadband connectivity and the ability to securely transfer information between business locations. Do you really want to go back to FAX messages and overnight mail to conduct business? On the other hand, can you afford to do everything you need to do electronically? You can with the right WAN connections.

The idea behind MPLS networks is the ability to send anything, anywhere, anytime without in any way affecting the voice, video or data involved. Many networks can’t do this very well. Take the Internet, for example. It definitely lets you connect to anybody, anywhere on Earth. How robust that connection is and how transparent it is to the packets that traverse it is another matter.

The whole reason for using TCP/IP to transmit data is to ensure that what you send gets delivered intact at the other end. It won’t necessarily happen on the first attempt. If is doesn’t work, TCP gives it another try. Eventually, everything you need to recreate a file on the far end that exactly matches the one that was sent arrives and can be re-assembled in order.

Time sensitive transmissions, such as interactive voice and video, may not fare so well. Just about any little upset causes them to glitch noticeably. Video may pixelate. Audio starts to distort and break up. As delays in transmission time mount, it may be hard to maintain an interactive conversation. You just don’t know when the other person will start speaking.

Little wonder that companies tend to stick with legacy technologies, like analog voice, that they know work, or create their own proprietary and very pricy internal networks. At least when you build it yourself, you have some control of the results.

The high cost and labor intensive nature of private networks combined with the flakiness of the public Internet is what makes MPLS networks shine. An MPLS network is a carefully engineered and managed wide area network for hire. MPLS networks have a regional, national or international footprint. You connect each of your locations to the network through an access connection, which may be anything from a T1 line or ISDN PRI, to a DS3, SONET/SDH, or an Ethernet over copper or fiber service.

MPLS networks are often referred to as “cloud” networks. You connect to and from the cloud, but don’t have to worry about managing the internals of the network. What’s happening inside the MPLS cloud is that special tags are added to your packets as they enter the network and removed when they leave. While on the network, those tags are used to route your packets from source to destination. The actual content of your packets is not disturbed in the process.

The MPLS network itself has to be transparent to all the traffic flowing through it. That means having adequate bandwidth available to support all users. MPLS supports all types of traffic, including IP data transfers, VoIP telephony, ISDN PRI telephony, video conferencing, video streaming and so on. You can specify the quality of service characteristic for each of your packets and the network will ensure that you have the bandwidth, jitter, latency and packet loss characteristics to support that quality. The MP in MPLS stands for Multi-Protocol, and that’s exactly what it is.

MPLS networks have largely replaced Frame Relay networks, a lower speed & less sophisticated approach to the same service. They are also replacing proprietary corporate networks constructed from multiple point to point line services. When it comes to connections that span the country and even reach out to international destinations, MPLS networks offer significant cost savings while maintaing high quality of service.

Do MPLS Networks make sense for your operation? Find out by checking the cost and availability of MPLS Network Services. Then compare price, effort and quality with what you are doing now to make the best decision.

IP VPN vs MPLS VPN

Security is an issue anytime you send data into a cloud network. One way to ensure that your data cannot be observed or tampered with is to build your own WAN network from point to point private lines. Another approach is to use a virtual private network that runs on resources that you don’t have exclusive use of. That’s what is meant by a VPN.

The beauty of using dedicated private line connections is that you are in control of both access and resource utilization. You need to manage bandwidth demand and packet priority. What you don’t have to worry about is someone else crowding you for resources. There is no one else. If you are really concerned about malicious parties tapping into your line surreptitiously, you can chose to encrypt the data while it traverses the WAN connection. That’s the ultimate in network security. It’s also the highest cost approach.

What’s attractive about VPN solutions is that they are much less expensive to lease and require fewer resources on your part. Both the cost and resource savings come from sharing the facilities with other parties. The Internet is a prime example of how massive utilization can drive down costs. If you want to really minimize costs, a shared access connection, such as DSL or Cable broadband, is the cheapest approach by far.

The same things that make the Internet cheap also make it insecure. Anybody and everybody worldwide can connect to the Internet for what you are paying or less. Perhaps they’re using a public library or WiFi hotspot network without paying a cent. Many of these networks make no effort to even verify user identity. It’s the perfect breeding ground for mischief makers and criminal activities.

Fortunately, there is a way to secure your data as it traverses the Internet. The trick is encryption. You encrypt your data packets using a key that only you know. Anyone else who has access to your data stream sees only gibberish. A popular standard for doing this is called IPsec for IP security. It requires hardware and/or software that you manage at each location for the encryption/decryption process.

IPsec lets you create a virtually private network out of the Internet, a completely public network. This is generally what is meant by the term IP VPN. One big advantage of this IP VPN approach is that laptop computers can be configured with this system to give corporate access to remote or home workers. All that’s needed is the VPN enabled computer and a broadband Internet connection.

While the Internet is cheap, it offers no guaranteed performance. You take your chances on network congestion, packet corruption, latency and jitter. File transfers generally work fine, but voice and video can degrade without warning. Many businesses want a more reliable network to connect their branch offices, warehouses, retail locations, and so on.

MPLS networks come to the rescue as an improved form of virtual private network. The MPLS network doesn’t have public access, but it is a shared resource. Your costs are reduced compared to dedicated private lines because the cost of regional, national or international connections are amortized across the total user base. What makes MPLS networks a VPN solution is that your data connections are essentially tunneled through the cloud wrapped in proprietary routing labels. You define your connections and the network operator instructs the MPLS network on how to route your packets.

MPLS networks are often referred to as MPLS VPN because they are inherently virtually private. Connections to the network tend to be through dedicated private lines, such as T1 or Ethernet. If you want an even higher level of privacy, you can choose to encrypt your data while it traverses the MPLS network. In addition to improved security compared to the Internet, MPLS networks offer performance guarantees for bandwidth, jitter, latency and packet loss. That makes MPLS VPN a popular choice for mission-critical business applications.

Do you have a need to connect multiple business locations? Which type of VPN makes the most sense for your needs? Is it IP VPN or MPLS VPN? One easy way to sort out the options is to get complimentary network consultation and price quotes through our Affordable VPN site. You may well be spending far more than you need to for the performance and security you desire.