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Load balancing (Cloud Load Balancer) is a service that distributes traffic to multiple CVMs. Load balancing can expand the external service capacity of the application system through traffic distribution and improve the availability of the application system by eliminating a single point of failure. The cloud load balancer service virtualizes multiple CVM resources located in the same region into a high-performance and highly available application service pool by setting virtual service addresses (VIP). Distribute the network requests from the client to the cloud server pool according to the way specified by the application. The load balancer service checks the health status of the CVM instances in the CVM pool and automatically isolates the abnormal instances, thus solving the single point problem of the CVM and improving the overall service capability of the application. Today, I will tell you how different external operators do load balancing.

How to do load balancing with multiple outside lines with the same operator? In this article, we introduced how to do load balancing when there are multiple external lines (the same operator). In practical use, the external lines of many users are from different operators (such as a telecom and a mobile). For most users, how to do load balancing with multiple external lines of the same operator? The scheme in can produce the effect of multi-line superposition. However, the direct balance of multiple external lines of different operators is not the optimal solution, mainly because of DNS: "if a terminal DNS queries a domain name, it obtains the IP; of operator A, but in the process of subsequent access, it will be balanced to operator B, which is not optimized enough." The solution mainly involves two technologies:

Operator shunt, according to the destination IP to automatically select the operator line (that is, telecom IP take telecom line, mobile IP take mobile line).

DNS redirection, configuring DNS redirection rules to set the client's default DNS (which also indirectly determines the client's line).

1. Operator diversion

WFilter NGF (WSG) has a built-in "operator triage" strategy, which is based on the IP segment of each major operator. As shown in the figure below, click the status flag to enable this "operator triage" policy.

When this policy is enabled, WFilter automatically detects the operator of each WAN port and automatically triages the operator.

2. DNS redirection

The client's DNS configuration may be manually specified by the client, or it may be assigned by DHCP. In order for the client to set up a reasonable DNS, you can turn on DNS forwarding in the DNS Settings of WFilter NGF. Let different clients use different DNS (naturally, they can go to different operators). As shown below:

3. Open line detection

After the line detection is turned on, the unobstructed condition of the line can be detected automatically. Once the line is blocked, it will not participate in equalization.

Generally speaking, when different operators are multi-line, because of DNS, load balancing should not be carried out directly, and the way of policy routing is more reasonable.

If there is anything else you need to know, you can find our professional technical engineer on the official website. The technical engineer has more than ten years of experience in the industry, so it will be more detailed and professional than the editor's answer. Official website link www.yisu.com

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