Settings to enable ASUS DSL-AC68U router to support 'Boost' TV channels (Sky and BT Sport):
In the LAN section , go to IPTV.
Set IPTV STB Port - none
Untick Remove VLAN TAG from DSL WAN to leave it blank
Use DHCP routes - Microsoft
Enable multicast routing (IGMP Proxy) - enabled
Enable efficient multicast forwarding (IGMP Snooping) - enabled
UDP Proxy - set to 0