It is not configurable through UI on FTD.
However, starting with 6.2 version of FTD you can use FlexConfig to push the BFD configuration on the FTD sensor.
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I asked about the correct nameserver as there's a Linux behavior that you encountered.
First you started with no nameservers or nameservers that didn't answer for your requests.
Then, you added the correct nameservers. However, there's a Linux ...