I'm not here for help. I have tried everything suggested in several threads to keep IPv6 up and working on my RBR850 with my Xfinity connection. The modem is a Netgear CM2000.
Included in what I have tried is two other mesh router systems from Asus and TP-Link and IPv6 support is rock solid on both and do not give me "not available" messages when the IP is renewed by the ISP. Please do not suggest I try anything except fixed firmware for my otherwise great RBR850 system.
