I can not set up the Total Bandwidth of my network for QoS to more than 100Mbps. I can reach speeds up to 350Mbps on my network (my ISP officially provides 400) when QoS is disabled, but when i enable

MTU size. I am connected behind optical network provider router that connects using PPoE, however my DECO network (4 times X20) connects to the router and does not set the correct MTU (it is set up as