Technical Manual Cn2 Broadband Hong Kong And Singapore Bandwidth Measurement And Quality Assessment Method

this article is a server -oriented technical manual, focusing on the bandwidth measurement and quality assessment methods of cn2 broadband between hong kong and singapore . the best solution usually chooses cn2 gia direct connection + on-site server (low latency, high stability), which is the highest cost; the best cost-effective solution is to use cn2 gt or hybrid routing + cloud vps for distributed measurement; the cheapest solution is to use public vps or measurement nodes combined with free tools for sampling evaluation.

clarify the test objectives (peak bandwidth, stability, packet loss, delay, jitter, routing changes), prepare servers at both ends (linux is recommended), fix public network ip, close the firewall or allow measurement ports, and optimize the system (adjust tcp buffer, enable bbr or appropriate congestion algorithm, network card interruption/segmentation settings).

commonly used proactive tools include iperf3 (tcp/udp concurrent stream testing), nuttcp, speedtest-cli, curl/wget (http download), and hping3 for specific packet detection. test points: number of parallel streams, test duration (>=60s), repetition at multiple time points, different mtu/port combinations.

use ping, mtr and fping to measure the round-trip delay and path stability, and record the bit delay (p50/p95/p99) and jitter (jitter). between nodes in hong kong and singapore , a common strategy is to sample in different time periods and summarize them into delay histograms.

the udp test (iperf3 -u) combines the sequence number to count the packet loss rate; under tcp, the retransmission rate of iperf3 and tshark packet capture can be used to analyze packet rearrangement. long-term monitoring can be done with sflow/netflow or using tcpdump to periodically capture packets to identify intermittent packet loss.

deploy vnstat, iftop, prometheus + node_exporter or grafana to monitor interface bandwidth, traffic pattern and queue length. the long-term baseline is used to determine the abnormal threshold and compare it with the sla. it is recommended that at least 1 week to 1 month of historical data be used as a reference.

check the routing path through traceroute/tcptraceroute and bgp. pay attention to the difference in routing between cn2 gia and gt. record the as path, hop count, and whether it passes through the mainland export or third-party transfer point. routing changes will significantly affect the quality of service.

to prevent the server from becoming a bottleneck, adjust kernel parameters (net.core.rmem_max/wmem_max, net.ipv4.tcp_rmem/tcp_wmem), turn off unnecessary services, use high-performance network card drivers and adjust interrupt binding; enable multi-queue (rss) and zero copy for large bandwidth tests.

core indicators include peak/average throughput, p95/p99 latency, packet loss rate, jitter, retransmission rate and routing stability. the recommended output format is csv/json+visual chart, and conclusive ratings (excellent/good/poor) and suggestions are provided.

for businesses pursuing the best experience: it is recommended to choose cn2 gia+ resident server in hong kong or singapore , with customized monitoring and sla. for those with limited budget: use cn2 gt or cloud vps for cross-city distributed measurement, combined with periodic detection of free tools to achieve a higher cost performance.

implementation process: 1) determine goals and indicators; 2) prepare and tune servers ; 3) deploy active/passive measurement; 4) collect multi-period data and perform routing analysis; 5) generate evaluation reports and implement optimization plans. by following this manual, the bandwidth measurement and quality assessment of cn2 broadband links in hong kong and singapore can be systematically completed.