About SD-WAN and its security measures 1
SD-WAN can be said to be SDN for WAN or the part of SDN related to WAN. WAN is an abbreviation for Wide Area Network, which is a remote LAN interconnected. A typical WAN is one in which a company's head office and branch offices each have a LAN and are connected by a communication line. In addition, SDN means “software-defined network”, and it varies from small LANs in offices to huge networks connected by communication lines, cloud services, and services accessed by a huge number of people such as SNS. Services are intricately involved. In other words, centralized management of domestic and overseas networks and multiple private networks.
By using SingTel's global SD-WAN service, companies can form a global overlay network across multiple domestic and overseas networks and centrally manage them with the SDN controller provided by SingTel as a single global WAN. .
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The reason why SD-WAN is said to be an innovative technology is that it allows you to make various settings on the software by using an original controller. There is a point that the setting can be managed centrally. In a conventional network environment, setting up a corporate network was a major premise. Therefore, it was necessary to communicate between sites using the Internet where security on the network is not secured or a dedicated line with secured security. In addition, since communication between bases is performed, immediate response, flexible response, and appropriate network selection occur. As a result, using the conventional WAN, the communication environment of the entire company is managed as the company scale increases. It puts a lot of burden on the person in charge, and it took more resources and costs than expected. However, with SD-WAN, it is possible to not only reduce the operational burden, but also more flexibly establish, change, and operate the connection between offices, which is essential for global companies.
SD-WAN is said to have various technical requirements. This is being discussed in the Open Networking User Group (ONUG) user community, and SD-WAN is a hot keyword.
The most noticeable SD-WAN product is the “Hybrid WAN” function. As a result, there is a possibility that the usage charges for private WAN services such as leased lines can be actively reduced. Previous “WAN optimization” products aimed at securing QoS and making effective use of bandwidth through data compression, caching, and transmission processing efficiency of traffic that passes through expensive communication services such as dedicated lines. . SD-WAN has changed its approach to providing a means to “proactively release traffic of relatively less important applications to public WAN services such as enterprise IP connectivity services”. Specifically, a dedicated network device (or virtual machine) is placed at each company location, and a function that distributes communication between remote sites and the head office (or company data center) according to the application is provided (such as distribution granularity) There is a difference between products). As a result, for example, access to an important in-house business application can be made through a private WAN service, while access to an in-house file server or cloud service from each base can be made through a public WAN service. By introducing this mechanism, the user organization can narrow down the contract bandwidth while checking the usage of private WAN service in the company.