I actually just found this https://tools.ietf.org/html/rfc4638
RFC4638 "Accommodating a Maximum Transit Unit/Maximum Receive Unit (MTU/MRU) Greater Than 1492 in the Point-to-Point Protocol over Ethernet (PPPoE)"
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Feb 12 2018
Feb 12 2018
I have to apologize. I did not read this RFC until now. I thought that since many Routers/Firewalls support this it would be a good idea to have it in VyOS too.
It is very unfortunate that this RFC was never updated.
Actually every chipset of every device i had in my hand supports packets a little bit bigger than 1500. Usually somewhere between 1600 and 2xxx bytes. So no problem there.
OK this is my starting config for the interface:
Jan 31 2018
Jan 31 2018