Part of this problem is there really isn't a layer 2 protocol for discovering the max MTU of a path. You have to use a higher protocol like ICMP to find it and

Part of this problem is there really isn't a layer 2 protocol for discovering the max MTU of a path. You have to use a higher protocol like ICMP to find it and then adjust your endpoint. The Internet will work with large L3/L4 packets assuming the path is able to create fragments. The article talked about the kernel's ability to hold fragments but it wasn't clear to me how Internet fragmentation comes into play or whether the performance gain is lost when using this on the Internet versus a LAN. Side tangent, this is one issue I have with the major cloud providers. Azure, AWS, et al all advertise high-bandwidth interfaces upwards of 100Gbps, but you can't saturate it anywhere near those rates with 1500 Byte packets from the Internet.