
I recently purchased the 8800nl to replace my BT supplied FTTC modem router combo.
Since changeover i am getting IPC6023 error on my youview box.
These settings were suggested but don't work.

On my 7800X I've got the following set:
Advanced>Multicast>IGMP: Membership Join Immediate ticked, Fast leave ticked and MLD: Fast Leave Ticked
Configuration>WAN>ppp 1.1 IGMP Multicast Proxy ticked
Configuration>WAN Add a new WAN Interface and set it to 'Bridge'
Your firmware may be slightly different of course but hope this points you in the right direction.
Any ideas would be welcome.