Ping fail upon router disconnect
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Hi all, I have a virgin hub for Internet access then going into one of the deco M9. Then another deco ethernet backhaul into office and 3rd radio backhaul. The main deco is the dhcp. Thing is, pinging devices works fine obviously, but when I disconnect the virgin box, those pings then fail..as if the Decos need an Internet connection even though my pings are intra-home network. Is this right? Why do deco have to maintain Internet connection? Or is it a config setting?
@TP-Link Hi there.
Yes Deco 1 (main) is in Router Mode
Setup, as shown in picture, is Virgin UK Cable Box feeding into Main Deco port 1 (yellow cable).
Main Deco Port 2 goes to netgear switch (black cable), of which one port is ethernet to garage office. That in turn goes to another netgear switch which feeds main PC and Deco #2.
Picture 
next picture shows main pc ping success to Deco 1 as gateway, with virgin internet connected:
next picture shows main pc ping success to son's pc:
next picture shows main pc ping FAIL to son's pc when virgin disconnected (yellow cable in picture 1 removed from deco #1)
Any help appreciated!!
Ultimate solution:
Virgin as main provider, with tplink archer MR400 as mobile broadband failover. However, not failover for whole household, but failover for garage office.
regards, Richard