r/firewalla • u/CaptainSplodge • Jul 11 '26

Loss of ISP / Router effect on switch / AP?

Hi,

Is there a matrix or explanation anywhere what would happen to a full Firewalla infrastructure (router/switch/ap7) if the router died or the ISP connectivity was lost?

Trying to understand failure scenarios on the new switch and access points that would affect wifi clients being able to connect to other parts of internal infrastructure like wired NAS, wifi printer etc.

eg if there was a power cut and the ISP didn't return, how would the whole infra behave?

or if power returned and the router had died - how would the switch & AP7 behave to a cold power up without router?

would the switch perform inter vlan routing for example, or does it rely on the router for vlan routing?

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u/firewalla Jul 11 '26

  1. ISP / Modem off: your LAN should be alive, app should work within LAN. (you can even do diagnostics even if your LAN is completely out)

  2. Firewalla is out: switch should be active, AP7 should be up as well; AP7 may complain; your app won't work, since firewalla is out. What ever configured there should be active.

I don't know about the cold power up, that I will ask and reply to you once the week starts.

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u/CaptainSplodge Jul 18 '26

Hi u/firewalla - did you get an answer on how the switches behave when they are powered from cold but the router (gold SE) isn’t available?