How To Configure Malaysia Cn2 For Multi-site To Achieve Stable Cross-border Access

In this article, we explain how to configure Malaysia CN2 for Multisite to achieve stable cross-border access. If you are pursuing the "best" performance, you should choose CN2 GIA-level dedicated lines and international direct connections; if you are pursuing the "best" cost-effectiveness, you can do a mixed deployment between CN2 GT and local high-quality bandwidth; if you are looking for the "cheapest", you can use ordinary international bandwidth with smart CDN and SD-WAN strategies to make up for the lack of direct connections. This article focuses on the practical operation and evaluation of the server side, and is intended for operation and maintenance/architecture engineers.

What is CN2 and why choose Malaysia

CN2 is China Telecom's next-generation backbone network, which is divided into two categories: GIA (high-end direct connection) and GT (general transmission). As a Southeast Asian node, Malaysia is geographically close to southern China and is suitable as an edge node for users in Southeast Asia, Australia, and southern China. For scenarios where servers are hosted in Malaysia and serve multiple sites, using Malaysia CN2 can significantly reduce round-trip latency, reduce packet loss, and improve stability.

Multi-site architecture and selection strategy

Multi-site scenarios usually include domestic sites, Malaysian nodes, and other overseas nodes. It is recommended to adopt the "master-slave + Anycast/GeoDNS" idea: the master station is placed in the computer room with the best performance (such as a computer room with CN2 GIA direct connection), and other sites do content distribution, caching and failover. Use smart DNS or load balancing to divert users to nearby sites and reduce the number of cross-border requests.

Comparison of lines and costs (GIA vs GT vs public network)

CN2 GIA: The best experience, low latency and low packet loss, but the highest cost, suitable for core business and paid SLA.
CN2 GT: Highly cost-effective and suitable for most commercial sites; it may be affected when the network is congested.
Public network bandwidth + CDN: The cheapest, but stability depends on third-party CDN and optimization strategies. It is suitable for projects with limited budget and that can tolerate variable delays.

BGP and routing configuration points

If you purchase independent public IP and BGP, you need to configure your own ASN or use a managed ASN. Key points include: rationally dividing prefixes, configuring route priorities (AS-Path, MED, Local Preference), enabling BFD fast detection to achieve fast failover, and requiring the use of CN2 marked community values ​​in the upstream to ensure that the CN2 path is taken.

Link redundancy and load balancing

To improve stability, it is recommended to have at least two links: a CN2 dedicated line and a local or public network backup link. Combining routing policies (BGP priorities) and SD-WAN can dynamically schedule traffic based on delay/packet loss. For HTTP/HTTPS traffic, Global Load Balancing (GSLB) can be used for DNS layer switching, combined with health checks to achieve automatic site switching.

Server-side performance and network tuning

The TCP stack should be optimized on the server: enable BBR (or BBRv2), adjust the TCP window, enable SACK, and MSS clamping to deal with cross-border MTU issues. Enabling Keep-Alive, HTTP/2, or HTTP/3 on the web server can reduce handshake delays. For large file transfers, use multi-threaded/concurrent connections and resumable transfers to improve bandwidth utilization.

Front-end acceleration and caching strategy

Combining CDN and edge caching can distribute static resources nearby, reducing pressure on the origin site and avoiding some cross-border bandwidth issues. For dynamic content, edge computing or dynamic caching rules and Origin Shield can be used to reduce the number of back-to-origin requests. For multiple sites, keep cache policies consistent to avoid data inconsistency issues.

Monitoring, Diagnostics and SLA

Establish a cross-site network monitoring system, including Ping, Traceroute, TCP connectivity, packet loss rate, Jitter and application layer response time. It is recommended to deploy active detection nodes to cover major traffic source countries/cities in order to quickly locate link problems or upstream routing problems. Sign a clear SLA with the supplier to define packet loss/delay thresholds and compensation terms.

Security and Compliance

Cross-border access faces DDoS and WAF requirements. Choose a computer room with cloud protection or local hardware protection, and enable WAF, current limiting, and login protection on the server side. For compliance, pay attention to the legal differences between Malaysia and China, and reasonably handle user data and log retention policies.

Typical implementation steps (practice list)

1) Evaluate the traffic and budget, and determine the GIA/GT/public network solution combination. 2) Select a Malaysian computer room with CN2 direct connection and sign a service order. 3) Configure BGP/ASN, prefix publishing and routing policies and perform community marking. 4) Tune the TCP stack and Web service parameters on the server side. 5) Deploy GSLB/GeoDNS and health check. 6) Connect to CDN and configure caching policy. 7) Establish monitoring and emergency switching procedures.

Frequently asked questions and handling suggestions

If cross-border packet loss occurs: first perform a two-way traceroute to locate the hop where the packet is lost, and then contact the corresponding provider; if the delay is high but there is no packet loss: check whether the route is detoured, and can be optimized by adjusting the BGP policy or using SD-WAN; if the cost suddenly increases: evaluate whether the traffic peak is due to crawlers or abuse, and supplement the access control and speed limit strategy.

Conclusion and recommendations

In short, to achieve stable cross-border access to multiple sites, the safest approach is to use Malaysian CN2 GIA or high-quality CN2 GT connection for the core business, supplemented by CDN, smart DNS and link redundancy to improve availability. When the budget is limited, the "cheapest but acceptable" compromise can be achieved through a hybrid solution of SD-WAN and CDN. Finally, ongoing monitoring and collaboration with your bandwidth/routing provider are equally critical.