Regarding the problem of China Telecom's AD dedicated line and virtual dialing, I beg for help from experts.

1. For your original network structure, you can use ACL to block commonly used P2P ports, or use RSVP (if your proxy server supports it) to limit the bandwidth of each host. And perform load balancing on the proxy server. In this way, three 4M bandwidths can satisfy 34 machines without any problem.

2. AD dedicated line is nothing more than ADSL virtual dial-up with more fixed IP. Although the AD dedicated line provides 8M bandwidth, since its physical link is basically the same as ADSL, the link delay is basically the same. The effective bandwidth utilization rate is generally around 80%, so 8M bandwidth will waste 8*0.2=1.6M bandwidth, while 4M will waste 0.8M bandwidth.

3. If you really want to upgrade the bandwidth, it is recommended to directly pull a 10M exclusive optical fiber or a 100M exclusive optical fiber. The prices of these two are about the same, and they are not much more expensive than two 8M optical fibers.

4. If the budget is sufficient, it is recommended to choose dual lines. A 10M telecom optical fiber (if you are in the south, pull Netcom in the north) as the main link, and then pull a 4M or 8M ADSL from other ISPs. And carry out policy routing, use different links to access servers of different ISPs, and use fiber optic main links to access commonly used servers.

In summary, upgrading bandwidth is not the most effective way, optimization is the most important, restrict P2P, limit the bandwidth of each host, etc.

Wish you a prosperous business.

Additional questions:

Compared with two 8M ADs and four 4M ADs, AD will be more stable than ADSL. As for the high and low ping value you mentioned, there are two possibilities (provided that you are sure that your physical wiring meets the specifications to avoid large broadcast storms and loops). 1 is the bottleneck of your proxy server. You can upgrade the proxy server software , or increase the proxy server hardware configuration to improve the situation. 2 is that your physical link to ADSL is interfered with.

You said it yourself, generally the ping value is between 20 and 30. It suddenly gets high, and then gets better again. Explain that bandwidth is not a limiting factor. It is recommended to solve the problem from the perspective of optimizing configuration.

One more point, there is no direct relationship between ping value and bandwidth. There is a direct relationship between ping value and link condition and server load. Online games have high requirements on ping value but average bandwidth requirements.