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For RUTXR1 by default, the SFP port is configured to be the WAN source for Wired Network.
You can configure it in Network > Interfaces > WAN
You can refer to these links for more info:
RUTXR1 WAN - Teltonika Networks Wiki (teltonika-networks.com)
RUTXR1 Interfaces - Teltonika Networks Wiki (teltonika-networks.com)
I hope it helps