Replacing Eero router from Giganet UK

[jcmiguel]

I have managed to configure IPv4 without issues to replace the router. My problem is with IPv6 as I tried everything I could find, including setting the VLAN tag to 911, without success. Sometimes, changes even drop my IPv4 as well. The strange thing is that when I go back to the Eero router, IPv6 works. My question is if I could snoop into the handshakes that Eero has with the isp (Giganet UK with cityfibre) and mimic what works. Also, I have a static ip contract.
Many thanks
Joao