Is it possible that my client PCs on 192.168.0.0 IPs can access the LAN2 port of the HG612 on the 192.168.1.0?
Possibly some config option in the Zyxel can allow this route to be forwarded?
Edit
All I did was change the LAN IP address on the HG612 web gui to 192.168.0.100. Sorted.