Should I change my OpenWrt mtu

Hi if my isp mtu is 1452 should I leave the OpenWrt wan mtu at 1500 or should it be 1452 + 28

Is your ISP demarcation Ethernet-based, PPoE or something else?

How did you determine this?

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My isp uses a gpon ont OpenWrt is in dmz isp doesn't provide bridge mode...I use tcp analyzer to check the mtu