Thanks. Since it is a quiet challenge for me as a newbie, sorry of the coming details . I'm not sure if I got this right but I have added [ethernet(38) ether-vlan(4) ether-vlan(4)] total of 46 for both dl/ul. The 38 value from the instruction provided since I have my 86u connected by ethernet to ISP router. The remaining 8 for PPPoE. Still not clear if MTU and MRU values will have an effect since they're already set to 1492. Should I add additional 4 bytes overhead since I'm using IPTV under LAN with VID internet number of my ISP added there (if it is considered Vlan)?See for overhead based on connection type. Added in extra dl/ul: https://openwrt.org/docs/guide-user/network/traffic-shaping/sqm-details#sqmlink_layer_adaptation_tab