getting RPC error on QoS options | XR500 in DumaOS on NETGEAR Nighthawk Support Posted December 17, 2021 3 hours ago, Netduma Fraser said: So can you get the ISP modem to handle L2TP exclusively in router mode so you can remove it from the XR? We're still improving the results for Benchmark for the XR routers so you can take that with a pinch of salt, it's unlikely to be that bad. Follow this guide while saturating your connection: http://support.netduma.com/en/support/solutions/articles/16000074717-how-to-test-your-internet-ping and try different percentages to see what lowers it the most. I downgraded the Firmware to v18.104.22.168. Seems like I don't get this error on this version. My ISP Modem is having issues handing L2TP by itself.