SQM - overhead question

Hi.
I'm starting to setup SQM but I'm not sure what should I fill in packet overhead.
I have a dedicated radio link that flows through a MIKROTIK- ROUTERBOARD NETMETAL 5 - RB 921UAGS - 5SHPACD - NM gateway.
According to the ISP, I should select Ethernet for the link layer option, but they don't know nothing about packet overhead (I suspect they should, but they don't :man_shrugging:)
Thanks in advance.

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Try ethernet with 45 byte overhead. It's an approximation big enough that it probably won't underestimate. underestimation is much worse than over...

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