two routers connected

Please advise how to get Internet back to FIOS Actiontec secondary router, just lost after ONT replaced by FIOS? I've got FIOS internet, voice, Tv; Asus RT-AC68W primary and ethernet connected to ONT. Actiontec is secondary in bridge mode. After FIOS swapped in a new ONT (losing internet...

Hello If I connect [router 1 lan port] to [router 2 wan port], how would I set it up so I can see all the clients as if they were on the same network? For example, I would want to be able to see 192.168.1.2 on router 1 from 192.168.2.2 on router 2 and vice versa. Many thanks