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wiki/sources/在Ubuntu上通过VPS-内网反向代理实现域名访问内网穿透.md
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wiki/sources/在Ubuntu上通过VPS-内网反向代理实现域名访问内网穿透.md
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title: "在Ubuntu上通过VPS+内网反向代理实现域名访问内网穿透"
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type: source
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tags: [vps, caddy, frp, reverse-proxy, 内网穿透, cloudflare]
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date: 2026-03-13
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---
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## Source File
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- [[raw/Home Office/在Ubuntu上通过VPS+内网反向代理实现域名访问内网穿透.md]]
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## Summary
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- 核心主题:通过 VPS (frps) + Caddy 构建内网穿透架构,实现通过域名访问内网服务
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- 问题域:内网服务公网暴露
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- 方法/机制:frp 隧道建立 TCP 连接,Caddy 反向代理提供 HTTPS,Cloudflare DNS 管理域名
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- 结论/价值:完整的内网服务公网访问方案,支持 HTTPS 自动证书
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## Key Claims
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- 架构:Cloudflare DNS → VPS (Caddy+frps) → frp 隧道 → 内网 NAS/Ubuntu
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- frps 监听 7000 端口,frpc 将内网服务映射到 VPS 本地端口(如 15000)
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- Caddy 反向代理 frps 映射端口到子域名,自动申请 Let's Encrypt HTTPS 证书
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- SSH 穿透不走 Caddy(纯 TCP),只通过 frps+frpc 实现
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- 故障排查重点:token 一致性、防火墙端口、frps 实际读取的配置文件路径
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## Key Quotes
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> "Caddy 不参与 SSH 的代理,只用 frps + frpc 配置即可完成" — SSH 穿透与 HTTP 穿透的本质区别
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## Key Concepts
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- [[FRP]]:内网穿透工具,frps 服务端 + frpc 客户端
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- [[Caddy]]:自动 HTTPS 的反向代理服务器
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- [[反向代理]]:将公网请求转发到内网服务
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- [[内网穿透]]:通过 VPS 中转实现公网访问内网
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## Key Entities
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- [[VPS]]:公网服务器(192.227.222.142)
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- [[Synology NAS]]:内网服务(192.168.3.17)
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- [[Ubuntu]]:内网服务器(192.168.3.47)
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## Connections
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- [[Cloudflare]] ← manages ← DNS
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- [[VPS]] ← runs ← [[Caddy]]
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- [[VPS]] ← runs ← [[FRP]]
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- [[FRP]] ← tunnels ← [[Synology NAS]]
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- [[FRP]] ← tunnels ← [[Ubuntu]]
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- [[Caddy]] ← proxies_to ← [[FRP]]
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## Contradictions
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- 无
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