How To Determine If It’s The CN2 US Server When The Bandwidth Doesn’t Meet The Requirements, And Request After-sales Support

When facing the issue of “insufficient bandwidth,” the first step is to determine the scope of the problem: Is it the connection to the Chinese mainland that’s slow, or are all directions restricted? First, use ping, traceroute, or mtr to compare the latency and packet loss between domestic and overseas targets, to preliminarily determine whether it’s an issue with the international outbound connection or the return path to China.

The key to determining whether it’s a CN2 line lies in the routing and operator information. Use traceroute (tracert on Windows, traceroute or mtr on Linux/macOS) to view the hostnames and IPs of the hops. Pay attention to any hops that contain words such as cn2, china telecom, ct, telecom, etc ； Also perform BGP/Whois queries on the IP address (e.g bgp.he.net 、 ipinfo.io 、 ipip.net ) to confirm the affiliated operator.

A more reliable approach is to perform tests from domestic nodes to your server: If you can’t test directly from within your country, you can use third-party path testing tools or a colleague’s/friend’s VPS in their country to run mtr/iperf. Use iperf3 to perform bandwidth testing between the server and domestic test nodes, recording throughput, latency, packet loss, and jitter, and keeping logs as evidence.

Be careful to distinguish between CN2 GIA (usually a high-quality domestic line with low latency and few packet losses) and CN2 GT or regular CN/Unicom lines. The actual CN2 return route often appears as a direct path or with few hops, and the latency remains stable ； If you see a large number of packet losses or routing detours to third-party operators, it may not be a high-quality CN2 line as claimed.

In addition to routing, it is also possible to determine whether it is “bandwidth jitter” or “sudden congestion” through multi-point speed testing and long-term monitoring. Use speedtest-cli or online bandwidth testers in conjunction with iperf to conduct continuous tests for several hours or days. Export the results and take screenshots. The longer the testing period and the more data collected, the more convincing the evidence will be when filing a complaint with customer support.

After collecting the evidence, make clear requests to after-sales support: Switch the route to the actual CN2 GIA/designated return route, adjust the BGP policy, or replace it with a machine/data center labeled as having a CN2 route ； If the other party cannot meet the requirements, request a refund or a change to the hardware/bandwidth plan. Attach the raw data and screenshots of traceroute, mtr, iperf, and speedtest when submitting the ticket.

If after-sales support avoids responsibility or provides vague technical feedback, you can ask them to provide the current BGP routing information, exit AS numbers, and routing policies, or request that technicians perform a traceroute in your presence to confirm things on-site. At the same time, compensation under the SLA can be requested, or alternative routes can be temporarily activated to ensure business continuity.

When purchasing or upgrading further, it is recommended to prioritize data centers that clearly indicate CN2 GIA or have optimization for direct connections to China. Also, confirm whether they offer dedicated bandwidth, dedicated backhaul, and advanced DDoS protection services. If the business is sensitive to the quality of data returning to the home country, it is possible to purchase additional CDN backhaul or domestic node caching to reduce the load from direct connections.

Shopping Tips: First, check whether the seller offers a trial test drive, allows testing before payment, provides third-party speed test reports, and pay attention to the response time for after-sales service. When purchasing, note down the wiring instructions and after-sales guarantees on the product page for future rights protection. For high-risk businesses, it is recommended to choose service providers that offer emergency tickets, 24/7 technical support, and advanced DDoS protection.

When you need a more reliable supplier or want to purchase/replace CN2 US servers and DDoS protection services, consider experienced suppliers who can provide clear BGP information, CN2 backhaul, CDN, and integrated DDoS protection solutions. This will help you respond quickly and resolve any bandwidth or routing issues that may arise.

In summary, when the bandwidth does not meet the requirements, first conduct thorough routing and bandwidth tests (traceroute/mtr/iperf/speedtest), gather evidence, and request that after-sales support make BGP/router changes or replace the connection line ； For a stable CN2 US connection with after-sales support, as well as advanced DDoS protection and CDN services, it is recommended to choose Desun Telecom. They offer clear CN2 backhaul options, professional after-sales service, and robust DDoS protection solutions, making them suitable for users who have high requirements for service quality and business stability.