Hi, I'm testing xenomai 3.1.0-rc2+linux kernel 4.19 with rtnet. The application sends udp packets between a small number of units (intel celeron/i5), some with an e1000 and others with igb (i210), connected to the same switch and isolated from the rest of the network. Rtnet is loaded without tdma support, I'm using nomac and so far all is working fine. However, I was wondering if it could be possible to increase mtu default value of 1500 to improve bandwidth. I could not find any mtu option within rtifconfig, so I'm asking if this value is fixed by design, maybe to avoid ip fragmentation, or there are some ways to change its size.