SD WAN is translated into a virtual network and a software-defined network, which is equivalent to deploying a soft router on a public cloud server with a fixed IP to connect the networks of different operators in different regions to form a large virtual local area network. Use the fixed IP broadband of the cloud server to provide network link connection conversion and bandwidth bridge forwarding for dial-up broadband without fixed IP, and connect multiple LAN networks through virtual links.
When the network is stable, the UDP protocol is used to transmit P2P traffic between LANs. When the network is unstable, use the cloud server's own bandwidth to provide network bridge forwarding traffic to connect to the network. Therefore, the SDWAN server's own bandwidth is only used as a bridge bandwidth when the network is unstable, and normal access is a P2P transmission method directly connected to the other party's network. For example, the uplink bandwidth of the Shenzhen network is only 100M, the uplink bandwidth of Beijing is only 50M, and the maximum speed of p2p transmission between Beijing and Shenzhen is only about 5MB/S. No matter how large the bandwidth of the third-party SDWAN server is, it cannot improve the bottleneck of the 100M physical uplink bandwidth of the Shenzhen Intranet and the 50M physical uplink bandwidth in Beijing. The business manager of Shenzhen Telecom recommended to me their sdwan uplink bandwidth package of 200M, but the dial-up broadband uplink in Shenzhen is only 100M, and the extra 100M is the IQ tax.
SDWAN can not only connect the entire local area network of various branches through bypass mounting and static routing, but also can replace VPN for personal business trips or home office use. Before implementing SDWAN, it is first necessary to plan the entire network in a unified manner to avoid conflicts between IP network segments and addresses of various companies, and then integrate the mutually independent intranets into a large local area network.
Domestic SDWAN is a mixed bag. One person can rent an Alibaba Cloud server, take a project source code or even open source source code and modify the interface as the SDWAN server, and then a company can be established. Many companies have a lot of PPTs, and they are unwilling to show the core core. They are all Internet-made cars. They really dare to publicly display their products on the website, and very few take them out for public testing. The epidemic is a crisis for the entire industry, a danger for some companies, and an opportunity. Some sales-oriented SDWAN companies have been eliminated, and some excellent domestic companies have been filtered out.
During the selection process of individual enterprises, a large number of SDWAN solutions were tried. There are carrier-level ones, such as the SDWAN cooperation between Shenzhen Telecom and a third party. The total price of a set of equipment and monthly rent is more expensive than their metro line. There are serious problems with product price positioning. This product is only suitable for pursuing new Technology, the person in charge of IT does not have a deep understanding of technology, outsources all telecommunications, listed companies and state-owned enterprise customers with a lot of people and money. Stability may not be mentioned, especially for large enterprises with more people, more money, more branches and more IT technology outsourcing. There are also network equipment manufacturers like Huawei Cisco Fortinet. Their SD WAN solutions are more inclined to fine-grained management. Using their own network technology, they can control application and terminal traffic, and benchmark technical products of international standards. This kind of product is complex to deploy and is suitable for the interconnection between large-scale large-scale enterprises with thousands of people. On the established private line, SDWAN technology is used to carry out more refined allocation and management of bandwidth resources. The equipment investment is as high as tens of thousands to hundreds of thousands, which is not suitable for ordinary small and medium-sized enterprises. There are also a lot of small businesses selling third-party or open source products with PPT. If the website does not announce the product download and trial, and asks you to leave a phone call, most of the secret pushes are of this kind. They are advocating international advanced technology, and the PPT templates are very beautiful, and even Taobao sells these routine templates.
Personally, I feel that the charm of the birth of SDWAN lies in the fact that small and medium-sized enterprises take advantage of the increasing common broadband resources and the new technology bonus of SDWAN to break the monopoly of expensive dedicated lines of traditional network operators, break the barriers of network connection isolation, and reduce the cost of enterprise network connection and communication. Otherwise, why do you have to use SDWAN to solve the problem of one or several dedicated lines through ip sec?! So the biggest advantage of SDWAN should be to help small and medium-sized enterprises reduce network costs and improve communication efficiency. Tool, incredible.
Therefore, I would like to recommend a few below. After many personal selection tests, the price is suitable, more suitable for small and medium-sized enterprises, the products are relatively mature and stable, and they are relatively well-known large companies in China.
Aikuai SDWAN Excellence Edition, 253 clients, unlimited traffic, provides 8M forwarding, more than 2000 a year, reasonable price, simple configuration, and good stability. Personally, in the Shenzhen test, the delay between the two places is about 15MS, no packet loss, and the connection configuration between branches is simple. The disadvantage is that it does not support linux system
Dandelion SDWAN Enterprise Edition 20 clients, more than 5,000 yuan a year is relatively expensive. I don’t know who set the price. It is estimated that the company has too many idlers. The forwarding bandwidth is 12M (about 1MB/S) speed, the delay between Shenzhen and Shenzhen is 12MS, the forwarding bandwidth is high, it supports win linux mac, and the client support is very comprehensive. Disadvantages: the price is too expensive, the configuration is troublesome, the connection will be dropped two or three times a month, and the device must be restarted
Because most of our company's 800 people use linux, they chose cassia sdwan, which supports linux connections, during the home office during the epidemic. Later, it was acquired by Dandelion, and now they all use dandelion sdwan. The branch office uses the Dandelion p5 box to connect to the headquarters, and installs the sdwan client to connect to the intranet for personal business trips or home offices. It has been relatively stable for a year. I also tested the sdwan of Aikuai before. Their connection configuration is very simple, and the speed is more stable, which is also very good. If there is no need for linux connection, it is a good choice.