What You Need To Know About Bandwidth And Routing Before Choosing Cn2 Gia Singapore Line

1. what is the cn2 gia singapore route and its applicable scenarios?

1) cn2 gia is a high-quality dedicated line backbone (global internet access) provided by china telecom for international services. it usually has better transmission paths and lower jitter when leading to singapore nodes.
2) suitable for businesses with high requirements on latency and stability such as sites for users in mainland china, game connections, and real-time voice/video services.
3) compared with ordinary public network uplink, the packet loss rate and delay jitter of cn2 gia are usually lower, especially during peak periods.
4) when selecting, attention should be paid to the supplier’s peering quality and the real link exported to china.
5) if the business is mainly for overseas users or the budget is sensitive, ordinary international lines or cdn cooperation can be considered to reduce costs.

2. bandwidth types and purchasing points (5 elements that must be understood)

1) port rate and actual bandwidth: what a 1gbps physical port can carry is not equal to the purchased exclusive bandwidth. it is necessary to distinguish between "port rate" and "guaranteed bandwidth".
2) dedicated bandwidth: the operator reserves the entire bandwidth for you, which is suitable for businesses with high stable throughput requirements; example: 100mbps exclusive, the peak value is 100mbps.
3) shared/burstable: the promised value can be exceeded in a short period of time, but the speed may be limited during peak periods. it is common in cheap vps.
4) cir and commitment jitter: some contracts list cir (committed information rate) and pir (peak). write these clearly when signing.
5) sla and measurement: require the supplier to provide sla for delay/packet loss/availability, and conduct real tests using iperf, mtr, and traceroute during the trial period.

3. routing basics and bgp policies (selection rules for multiple links)

1) bgp route selection considers in order: local preference, as_path, origin, med, ebgp takes precedence over ibgp. understanding these can help tune the egress.
2) when deploying multiple lines, you can use the local priority (local_pref) to adjust the export priority to china to select cn2 gia.
3) the path with the short as_path is usually preferred, but it does not always have the lowest delay and must be tested in conjunction with the actual delay.
4) if there are dual upstreams (cn2 gia + local isp), diversion and backup can be achieved through bgp community tags.
5) routing transparency is important: vendors should be able to provide route visibility and historical packet loss logs to major chinese nodes.

4. server/vps/host configuration example and data table demonstration

1) sample configuration a (exclusive for entry-level users): vps-1, 2 vcpu, 4gb ram, 50gb nvme, 1gbps port, exclusive bandwidth 100mbps.
2) example configuration b (cn2 gia high availability): vps-p, 4 vcpu, 8gb ram, 200gb nvme, 1gbps port, exclusive bandwidth 500mbps, bgp unicast cn2 gia egress.
3) example configuration c (multi-line hybrid): bare metal s, 8 vcpu, 16gb ram, 1tb nvme, 10gbps port, cn2 gia + local isp dual lines, bgp multi-exit.
4) delay example (actual test, for reference only): the average delay from vps-p singapore (cn2 gia) to beijing is about 45ms, and ordinary international lines are about 95ms.
5) the table comparison is as follows (sample data, please retest before purchasing):

configuration	bandwidth type	port/peak	delay to china (example)	ddos protection
vps-1 (entry)	share/burst	1gbps/100mbps	95ms	basic cleaning 1gbps
vps-p (cn2 gia)	exclusive	1gbps/500mbps	45ms	cloud cleaning 5gbps
bare metal s (multiple wire)	exclusive + bgp	10gbps/5gbps	40ms	cloud + local hybrid 10gbps+

5. cdn, domain name resolution and optimization strategies

1) using international cdn nodes (including singapore pop) can reduce static resource delays, and using cn2 back-to-origin can improve chinese user experience.
2) anycast dns and geodns: anycast is suitable for fast global resolution, and geodns can direct chinese users to nodes with cn2 back-to-origin.
3) if the main site is in singapore, it is recommended to adopt a nearby return-to-origin or diversion strategy for key apis or logins to avoid cross-border return-to-origin every time.
4) domain name registration and registration acceleration: for chinese users, they need to pay attention to icp registration and domestic resolution acceleration solutions to reduce the problem of slow dns resolution.
5) testing tools: use curl -w, mtr, and ping to conduct real-time verification from multiple domestic points, and combine the monitoring data of the cdn provider to determine the optimization effect.

6. ddos defense key points and real cases

1) protection classification: edge cleaning (cdn/anycast), managed cleaning (cloud protection), local equipment. appropriate throughput protection should be selected based on business peaks.
2) examples of protection capacity: small and medium-sized sites usually require at least 5-10gbps cleaning capacity. during peak e-commerce/game periods, it is recommended to have more than 20gbps or expand capacity as needed.
3) real case: a cross-border e-commerce company used singapore cn2 gia + cloud cleaning (peak protection 10gbps) during the double 11 period. when the traffic peaked, the user order delay dropped by about 35% compared to last year, and the page success rate increased by 3.8%.
4) configuration recommendations: it is recommended that the protection link be routed to the cleaning center separately (bgp bypass), and the return-to-origin whitelist and rate threshold policy should be retained.
5) monitoring and drills: conduct ddos recovery drills regularly, monitor syn, udp, and http abnormal traffic, and set alarms and automatically switch routing strategies to ensure availability.