The omnia receives a gateway 192.168.1.1 but the br-lan itself is also 192.168.1.1. on the WAN interface the Omnia has IP address 192.168.1.5.
With help of DHCP it distributes ip-addresses in the range 192.168.1.x.
Without being an expert, but I think most home routers use 192.168.1.1 as their own address.
But I can try to change the Omnia’s IP address at LAN0.
If the link on that NIC is lost for any reason, the other NIC becomes active.
Before activating NIC teaming, please ensure that both NICs are connected to the same network segment (subnet) and that you have IP addresses configured on only one of the existing NICs.