Mikrotik rb750gr3 radvd invelid mtu

RouterOS General
1

Please help continuesly show warning I am using pppoe connection in port 1
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2

The RA MTU (1492) exceeds the pppoe MTU (1480). Try manually setting MTU + MRU to 1500 in pppoe client to enforce RFC 4638.

3

U means I change mtu value in port 1

4

Try manually setting MTU + MRU to 1500 in pppoe client to enforce RFC 4638.

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5

Dear nescafe when I set mtu mru on 1500 internet not work I my old setting when I ping 8.8.8.8 packet size1500 it show time out when I set set packet size on 1480 it ping easily