The plan had been activated a long time before we were called. In between, she had tried everything the internet suggested: a DSL cable, a WAN cable, two routers connected to the modem at the same time, and a set of admin passwords and settings changed along the way. The photos she sent were, by her own description, a mess. That is not a criticism — it is what happens when you follow guides written for someone else's connection.
宽带其实早就开通了，只是一直没通网。这期间她把网上能搜到的攻略几乎都试了一遍：DSL 线、WAN 口的线、光猫后面同时接了两台路由器，路径中还改过后台密码和一堆设置。用她自己的话说，发过来的照片就是“线路大乱斗”。这不是在批评她——照着别人家的攻略操作，结果通常就是这样。
Before diagnosing anything we reduced the setup to one path: modem LAN1 straight into the WAN port of a router we knew was good. Everything else came out — the second router, the DSL cable, and the settings changed during previous attempts. You cannot isolate a fault in a network that has two routers and unknown configuration in it. Simplify first, then test.在诊断任何东西之前，我们先把整套接线收敛成一条路径：光猫 LAN1 口直接接到一台我们确定没问题的路由器的 WAN 口。其余全部拆掉——第二台路由器、DSL 线，以及之前尝试过程中改过的设置。一个同时挂着两台路由器、配置状态又不明的网络，是没法定位故障的。先简化，再测试。
| Before改造前 | After改造后 | |
|---|---|---|
| Connection type联网方式 | Assumed from online guides照着网上攻略猜的 | Confirmed as fibre in her own account在她自己账号里确认为光纤 |
| Cables in use在用的线 | A DSL cable and a WAN cable, both triedDSL线和WAN口的线都试过 | One cable: modem LAN1 to router WAN只有一根：光猫LAN1到路由器WAN |
| Routers connected接着的路由器 | Two at the same time behind the modem光猫后面同时挂两台 | One, dialling PPPoE一台，负责PPPoE拨号 |
| Router settings路由器设置 | Admin password and options changed in earlier attempts之前尝试中改过后台密码与若干选项 | Clean configuration on a known-good unit在已知良好的设备上重新干净配置 |
| Result结果 | No internet despite an active plan套餐是活的，但一直没网 | About 50 Mbps, matching the plan约50兆，与套餐一致 |
Root cause: the setup had drifted into a tangle — a DSL cable on a fibre service, two routers behind the modem at once, and settings changed across many attempts — so nothing could be isolated. After confirming from her Superloop account that the service is fibre, reducing everything to modem LAN1 into one known-good router with PPPoE, and having support refresh the service from their side followed by a full power cycle, the connection came up and tested at about 50 Mbps, matching her 50M plan.
根因是环境已经乱了——光纤服务上插着 DSL 线、光猫后面同时挂两台路由器、多次尝试中改过一堆设置——导致任何故障都无法定位。在她的 Superloop 账号里确认服务为光纤后，把接线收敛成光猫 LAN1 直连一台已知良好的路由器并配置 PPPoE，再请客服后台刷新服务、全部设备断电重连，网络随即接通，现场测速约 50 兆，与她的 50M 套餐一致。
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