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A Few Ways to Safely Use Public IPv6
Friday, February 28, 2025 in Network
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Some people need to “go home” via public IPv6. Unlike Tailscale/Zerotier et al., which rely on NAT traversal to create direct tunnels, native IPv6 offers a straight-through connection. Cellular networks almost always hand out global IPv6 addresses, …
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Using Common DDNS Subdomains May Cause China Telecom Broadband Service Degradation
Wednesday, February 19, 2025 in Network
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I have been troubleshooting IPv6 disconnections and hole-punching failures for over three months. I’ve finally identified the root cause; here’s the story. My First Post Asking for Help—IPv6 Disconnections IPv6 had been working perfectly. Without …
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Compliance Discussion of Reverse Proxy in Home Networks
Monday, February 17, 2025 in Network
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Background About 90 days ago, I encountered an IPv6 connectivity issue with China Telecom Hubei. After long-term observation and analysis, here are the findings. Problem Analysis Two initial suspected causes: PCDN usage detection No active use of …
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Some Characteristics of China Telecom IPv6
Friday, June 28, 2024 in Network
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Some Characteristics of China Telecom IPv6 Some Characteristics of China Telecom IPv6 IPv6 has been fully rolled out nationwide; the IPv6 address pool is large enough for each of every individual’s devices to obtain its own IPv6 address. To actually …
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Why we should not think of UDP in terms of TCP
Friday, June 28, 2024 in Network
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Why we should not think of UDP in terms of TCP Why we should not think of UDP in terms of TCP? Structural Differences TCP has many concepts: connection establishment, resource usage, data transfer, reliable delivery, retransmission based on …
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Troubleshooting Linux Network Issues
Tuesday, May 28, 2024 in Network
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Troubleshooting Tools Tool Description Usage Note ping Test network connectivity ping baidu.com traceroute Route tracing traceroute ip route Routing table route -n netstat Network connections netstat -ano nslookup DNS resolution nslookup baidu.com …
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How to Improve Network Experience with a Self-Hosted DNS Service
Saturday, May 18, 2024 in Network
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Network Quality vs. Network Experience Do nothing, and you’ll already enjoy the best network experience. First, note that “network quality” and “network experience” are two different concepts. Communication is a process involving many devices. The …
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Bypassing ChatGPT VPN Detection
Thursday, May 09, 2024 in Network
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How to handle the ChatGPT error messages “Unable to load site” “Please try again later; if you are using a VPN, try turning it off.” “Check the status page for information on outages.” Foreword ChatGPT is still the best chatbot in terms of user …