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ISR 819 failover routing fails for LAN hosts...

my C819HG-4G-V-K9 is configured as DHCP server for LAN and gigabyte0 interface as primary with cellular0 as backup. _the router fails over and back as advertised and has the capability to route in both modes primary and backup when testing from the router. _my issue is with my DHCP clients, they lose the ability to route to the internet when the router is in the backup, cellular mode. _does this sound like a router DHCP configuration issue or something to do with the router's IP route.?

 

    

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