The Official Website Of Cera In The United States Does Not Have The Potential Impact Of Cn2 On The Access Experience Of Global Users.

1.

problem overview: direct impact of cn2 loss on access links

the official website of cera in the united states is not connected to china telecom's cn2. as a result, outbound routes from mainland china generally take the public internet or third-party backbones, resulting in increased latency.
an increase in the number of path hops can easily trigger routing instability and short-term jitter, affecting the success rate of tcp handshake and tls connection establishment.
increasing packet loss rates will lead to http retransmissions and extended page loading times, significantly degrading the user experience.
the impact on mobile terminals and long connections (websocket/real-time push) is more obvious, and the user experience fluctuates greatly.
timeouts and retry noise may occur for clients that rely on api calls (such as apps and iot gateways).

2.

performance data examples and quantified impact

the following table is a typical measurement comparison of a us cera official website (pseudonym example) from several points around the world to the site: no cn2 path vs assumed access to cn2 after optimization (example value).

measuring point	no cn2 rtt(ms)	no cn2 packet loss (%)	cn2 assumes rtt(ms)	cn2 assumes packet loss (%)
beijing	220	1.8	120	0.3
shanghai	200	1.5	110	0.2
guangzhou	240	2.2	130	0.4
hongkong	90	0.6	70	0.2
los angeles	35	0.2	35	0.2
frankfurt	95	0.4	95	0.4

the data in the table are typical observation examples, used to quantify the difference in delay and packet loss caused by the absence of cn2.

3.

real case: problems encountered by a multinational company and diagnosis

users in china complained about the slow loading of the homepage of the u.s. official website of a multinational company (anonymous). after analysis by traceroute and tcpdump, it was found that many routes to the u.s. were relayed by third-party isps and suffered from high packet loss.
checking the bgp route, we found that the front end did not use anycast or china direct connect export, causing traffic to enter congestion points and be retransmitted frequently.
the site is deployed as aws us-east-1, the instance specification is t3.medium (2vcpu/4gb), the elastic public network bandwidth is 10mbps, and the bandwidth is saturated and the number of concurrent connections exceeds the nginx default during the upstream peak.
temporary measures include turning on gzip, adjusting keepalive_timeout, and increasing worker_connections. the page loading time will be improved by about 25% in the short term.
the long-term recommendation is to access cn2 or deploy china/cdn nodes and activate ddos cloud protection and anycast export.

4.

examples of implementable server and network configurations

server configuration example: ec2 t3.medium, ubuntu20.04, 50gb ebs, elastic public network bandwidth 10mbps; web layer nginx example configuration: worker_processes auto; worker_connections 8192; keepalive_timeout 15; gzip on.
linux kernel optimization example (/etc/sysctl.conf): net.ipv4.tcp_tw_reuse=1; net.core.somaxconn=65535; net.ipv4.tcp_fin_timeout=15; net.ipv4.tcp_syncookies=1.
recommended network architecture: deploy cdn + origin site anycast + bgp multi-line export in china or hong kong, or purchase cn2/gia direct connection to reduce rtt and packet loss.
ddos protection: use waf and cloud cleaning (filtering by peak) at the edge, and use rate limiting and blackhole strategies at the backbone egress.
monitoring recommendations: deploy ping/http rtt monitoring, syn/est connection number alarms, and real-time packet loss and path mutation detection (sampling every 5 minutes).

5.

conclusion and implementation suggestions

conclusion: the us cera official website is not connected to cn2, which will significantly increase rtt and packet loss among mainland chinese users, affecting the experience and increasing operation and maintenance costs.
priority recommendations: 1) deploy a global cdn and provide node coverage in mainland china/hong kong; 2) if traffic and budget permit, connect to cn2/gia or directly connect with local clouds/operators in china; 3) optimize the origin server configuration and kernel parameters; 4) launch cloud ddos protection and waf.
cost trade-off: cn2 access costs are higher than the public internet, but it can improve stability and conversion rate. roi needs to be evaluated based on traffic scale and business value.
implementation steps: first conduct traffic stratification, deploy cdn pilot, and use rum+ to synthesize monitoring and evaluate the effect, and then gradually promote the cn2 or direct connection solution.
conclusion: the network path determines the experience, and a reasonable combination of multi-line + cdn + protection is a feasible route to alleviate the impact of missing cn2.