How To Determine Whether There Is A Path From Cn2 To The United States Bypassing Singapore For Traffic And Adjust It

Short introduction: In cross-border network optimization, determining whether the traffic has taken the off-site path of "cn2 to the United States and around Singapore" will have a significant impact on delay, packet loss and user experience. This article is oriented to the needs of network operation and maintenance and SEO optimization. It systematically introduces detection methods, judgment criteria and practical adjustment strategies to help quickly locate and improve path problems, and improve access stability and search engine performance.

CN2 usually refers to the second-generation dedicated line or proprietary transmission path of a carrier-grade backbone network, which is characterized by low packet loss, priority routing and multiple international entrances and exits. CN2 paths often pass through Asian transit points or direct overseas nodes when accessing cross-border traffic. Identifying its characteristics can help determine whether the traffic passes through a specific geographic transit point, such as Singapore.

Detours may occur due to a variety of factors, including operator policies, temporary congestion, BGP routing, interconnection point (IX) policies, or failover. In order to ensure stability, operators may choose mature transit nodes through Singapore, resulting in an obvious detour on the path from CN2 to the United States, which is different from the originally expected direct exit.

Detection paths require a combination of multi-tools and multi-perspective data, including Traceroute/MTR, BGP routing information, Looking Glass, traffic sampling and delay measurement. Simultaneous detection of multiple points can avoid misjudgments from a single measurement, and combined with geographical IP database and AS number information can more accurately determine whether to transit through Singapore.

Use Traceroute or MTR to record the IP, delay and packet loss rate of each hop, and pay attention to the geographical location and ASN ownership of the hop. If the Singapore IP or ASN pops up in the middle of multiple measurements and the RTT increases significantly in this section, it can be preliminarily determined that there is a path around Singapore.

Verify the egress path and AS_PATH of the prefix through carrier Looking Glass or public BGP route viewing. If the BGP announcement shows that the next hop or path contains Singapore-related ASNs or switching points, it can be confirmed that there is a detour at the routing level, which facilitates communication and adjustment with the upstream.

When making the decision, you can refer to: Continuously measured intermediate hops belong to Singapore, AS_PATH contains Singapore ASN, the RTT and packet loss of the corresponding segment are significantly increased, and the summary results of different source points are consistent. Meeting multiple conditions can improve the confidence of judgment and avoid misjudgments caused by errors in a single measurement or IP geographic database.

If the detour is confirmed, you can communicate with the upstream or the bearer to adjust the BGP policy (such as modifying LOCAL_PREF, using BGP community), select alternative exits, optimize interconnection points, or use multiple transmission backups. If necessary, the DNS or Anycast policy can be adjusted to guide traffic to the desired outlet point to reduce the impact of delay and packet loss.

Summary: To determine the path of "cn2 to the United States bypassing Singapore", it is necessary to combine Traceroute, MTR, BGP data and geographical/ASN information, and then adopt strategies such as BGP adjustment, route change, or adding interconnection points after confirmation based on multiple criteria. It is recommended to establish a regular monitoring and alerting process, maintain communication with upstream, and continuously optimize to ensure user experience and SEO performance.