有时一台海外 VPS 在国内”完全连不上”——ping 不通、SSH 连不上，但换个地方又正常。这通常是 IP 被墙了。
一句话解释
在中国大陆访问海外服务器时，有的整个 IP 被 GFW（防火墙）封锁，导致从国内完全无法连接（丢包 100%）。
常见原因
- 该 IP 曾被用于翻墙 / 代理，被识别封锁。
- 所在 IP 段被整体封（某些知名”翻墙友好”商家的 IP 段会被大面积封）。
- 被举报或触发了某些特征。
怎么判断”被墙”还是”线路差”
- 被墙：国内 ping 完全不通（100% 丢包），但用海外节点测正常。
- 线路差：能连上、只是慢 / 高峰卡——这是 回程线路 的问题，不是被墙。
应对
找商家换 IP（很多商家可付费换）、套 CDN 中转、或选冷门、未被滥用的 IP 段。
想直接挑合适的在售机型？去 库存监控 按线路 / 地区筛选。
Sometimes an overseas VPS is completely unreachable from China — ping fails, SSH won’t connect — yet everything works fine from somewhere else. This is usually an IP that’s been blocked.
One-Line Explanation
When accessing overseas servers from mainland China, some IP addresses are blocked by the GFW (Great Firewall), making them completely unreachable from within China (100% packet loss).
Common Causes
- The IP was previously used for proxying and was identified and blocked.
- The entire IP block was mass-banned (IP ranges from certain well-known “proxy-friendly” providers are frequently blocked in bulk).
- The IP was reported or triggered certain detection signatures.
How to Tell the Difference: Blocked vs. Bad Line
- Blocked IP: Pings from China time out completely (100% packet loss), but testing from an overseas node works fine.
- Bad network line: You can connect, but it’s slow or congested during peak hours — that’s a return route issue, not a block.
What to Do
Ask the provider to swap the IP (many charge a small fee), route traffic through a CDN relay, or choose a less-abused IP block that’s not yet flagged.
Ready to pick the right VPS? Go to Stock Monitor and filter by network line / region.
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