Photonicat 2 多出口与故障切换：修订间差异

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* '''WiFi associated but no internet''' (e.g. an unauthenticated hotel portal): Smart WAN's connectivity probe '''temporarily demotes''' wan_wifi below cellular — internet traffic uses cellular while the WiFi stays associated for you to log in; the metric is restored on recovery. See [[Photonicat 2 Smart WAN 智能上网|Smart WAN]].
* '''WiFi associated but no internet''' (e.g. an unauthenticated hotel portal): Smart WAN's connectivity probe '''temporarily demotes''' wan_wifi below cellular — internet traffic uses cellular while the WiFi stays associated for you to log in; the metric is restored on recovery. See [[Photonicat 2 Smart WAN 智能上网|Smart WAN]].


=== Interaction with mwan3 ===
=== Interaction with pcat-manager ===
Stock mwan3 only tracks the wired wan (eth0): when it drops, mwan3's policies would shove '''all''' traffic to cellular, '''skipping WiFi relay''' and defeating the metric chain. So while Smart WAN is enabled, the manager automatically '''switches mwan3's rules to default metric routing''' (backing up your policies) and restores them when Smart WAN is turned off. Keep this in mind if you hand-tune mwan3.
Stock pcat-manager only tracks the wired wan (eth0): when it drops, pcat-manager policies would enable cellular network, '''skipping WiFi relay''' and defeating the metric chain. So while Smart WAN is enabled, the manager automatically switches pcat-manager rules to default routing rule and restores them when Smart WAN is turned off.


=== Dashboard indicators ===
=== Dashboard indicators ===

2026年7月13日 (一) 15:42的最新版本

适用 / Applies to Photonicat 2, photonicatWrt 26.04.x + pcat-manager-web 2026-06 及以后版本 / Photonicat 2, photonicatWrt 26.04.x with pcat-manager-web builds from 2026-06 onward

Photonicat 2 同时拥有有线 WAN、WiFi 中继（Smart WAN）和 4G/5G 蜂窝三类出口。本页解释它们如何排定优先级、断线时如何自动切换、仪表盘指示灯的含义，以及排障方法。

The photonicat 2 has three egress classes at once: wired WAN, WiFi relay (Smart WAN), and 4G/5G cellular. This page explains how they're prioritized, how failover works, what the dashboard indicators mean, and how to debug it.

中文说明

优先级：路由 metric 链

故障切换完全由路由 metric（数值越小优先级越高）决定——所有出口可以同时在线，流量始终走 metric 最小的可用出口：

出口 接口 metric 说明
有线宽带 wan (eth0 / pppoe-wan) 1（IPv6 别名 wan_6 随主接口） 最高优先级
WiFi 中继 (Smart WAN) wan_wifi / wan_wifi_v6 5 / 6 次优先
5G 蜂窝 wwan_5g / wwan_5g_v6 10 / 11 兜底
LTE 蜂窝 wwan_lte / wwan_lte_v6 12 / 13 兜底（LTE 模组）
  • 插上网线 → 有线立即接管（metric 1 最小）。
  • 拔掉网线 → 有线路由消失，流量自动落到 WiFi 中继；WiFi 也没有 → 蜂窝。全程无需人工干预。
  • WiFi 连上了但没有互联网（如未登录的酒店门户）：Smart WAN 的联网探测会把 wan_wifi 的 metric 临时调到蜂窝之后——上网流量走蜂窝，WiFi 链路保持连接供你登录；探测恢复后自动还原。详见 Photonicat 2 Smart WAN 智能上网。

与 pcat-manager 的关系

固件自带的 pcat-manager 默认只跟踪有线 wan（eth0）：有线一断，pcat-manager 的策略会自动开启蜂窝网络，跳过 WiFi 中继，破坏上面的 metric 切换链。因此启用 Smart WAN 时，管理程序会自动把 pcat-manager 的规则切换为系统默认；关闭 Smart WAN 时自动还原。

仪表盘指示

  • 首页拓扑图只点亮当前真正承载流量的出口（而不是"接口在线"）——有线/WiFi 中继/蜂窝一目了然。
  • 同时显示 WiFi 信号强度与当前网络模式；多出口在线时 WAN 图标为组合图标。
  • LAN 绿点只在存在可用出口时点亮。

排障

ip route show default          # IPv4 默认路由及 metric（可能有多条，走 metric 最小者）
ip -6 route show default       # IPv6 同理
ip route get 1.1.1.1           # 当前实际选择的出口
ifstatus wan_wifi | head       # Smart WAN 接口状态
logread | grep -i wifi_wan     # Smart WAN 巡检/切换日志
  • 流量走了蜂窝但 WiFi 明明在线 → 查 ip route show default：若 wan_wifi 的 metric 被调高，说明门户探测判定该 WiFi 无法上网。
  • 切换后个别应用卡住 → 长连接（VPN、SSH）绑定旧出口地址是正常现象，重连即可。

English

Priority: the route-metric chain

Failover is driven purely by route metrics (lower wins). All uplinks can be up simultaneously; traffic always takes the lowest-metric available route:

Egress Interface Metric Role
Wired broadband wan (eth0 / pppoe-wan) 1 (IPv6 alias wan_6 follows) top priority
WiFi relay (Smart WAN) wan_wifi / wan_wifi_v6 5 / 6 second
5G cellular wwan_5g / wwan_5g_v6 10 / 11 fallback
LTE cellular wwan_lte / wwan_lte_v6 12 / 13 fallback (LTE modems)
  • Plug in ethernet → wired takes over instantly (metric 1).
  • Unplug it → the wired route vanishes; traffic falls to WiFi relay, then to cellular if no saved WiFi is reachable. No manual action.
  • WiFi associated but no internet (e.g. an unauthenticated hotel portal): Smart WAN's connectivity probe temporarily demotes wan_wifi below cellular — internet traffic uses cellular while the WiFi stays associated for you to log in; the metric is restored on recovery. See Smart WAN.

Interaction with pcat-manager

Stock pcat-manager only tracks the wired wan (eth0): when it drops, pcat-manager policies would enable cellular network, skipping WiFi relay and defeating the metric chain. So while Smart WAN is enabled, the manager automatically switches pcat-manager rules to default routing rule and restores them when Smart WAN is turned off.

Dashboard indicators

  • The topology lights only the egress actually carrying traffic (not merely "interface up") — wired / WiFi relay / cellular at a glance.
  • WiFi signal strength and the current network mode are shown; WAN icons composite when several uplinks are up.
  • The LAN green dot requires a live egress.

Debugging

ip route show default          # IPv4 default routes and metrics (lowest wins)
ip -6 route show default       # same for IPv6
ip route get 1.1.1.1           # which egress is actually selected right now
ifstatus wan_wifi | head       # Smart WAN interface state
logread | grep -i wifi_wan     # Smart WAN reconcile/failover logs
  • Traffic on cellular while WiFi looks fine → check ip route show default: a raised wan_wifi metric means the portal probe judged that WiFi offline.
  • An app hangs right after failover → long-lived connections (VPN, SSH) pinned to the old egress address must reconnect; that's expected.

Photonicat 2 Smart WAN 智能上网 ｜ Photonicat 4G/5G 家庭网络备份 ｜ Photoincat 2 IPv6 PPPoE

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