DSL-AC68U changes IP when it fails over to USB 4G (LTE) connection....Is that normal?

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When my DSL-AC68U fails over to a USB 4G card the router LAN IP adress changes. It also seems to change the DHCP scope. I did a factory reset and was able to replicate after it was setup again. Anyone seen this?

My router LAN IP went from to The DHCP was something like 192.168.2.x to 192.168.2.y

Didn't seem to want to fail back.

Is this normal?

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