RFC 4638 (MTU 1508) possible on (stock) RT-AX88U or RT-AX92U ?

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bpwats

New Around Here
Hello,
I enjoy a gigabit fiber connection up to a theoretical speed of 977 mbit/sec. Currently, I have MSS clamping enabled (MTU and MRU are set tot 1448), because the stock firmware GUI will not allow me to set MTU / MRU values above 1492. This will give me up to about 928 mbit/sec download speeds.

Asus-WAN1.png


My provider Freedom Internet (Netherlands) supports RFC 4638 (MTU 1508) for sure. If possible, it is recommended by their tech support to use RFC 4638. They tell me to: switch on jumbo frames, use MTU 1500 on LAN, use 1508 on raw WAN interface. This would enable a PPoE tunnel of 1500 and eliminate the need for MSS Clamping.

Is this scenario possible on the RT-AX92U (or RT-AX88U)? If it would mean to switch to Merlin or use SSH into the Asus router, this would not be an issue for me. How much would the speed benefit be?
 
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