Mac won’t connect to internet

I have an interesting problem and I believe I may be halfway to understanding it but don’t know how to fix it. My home network has two routers. One is the main one and is in a cabinet so I do not have wifi enabled as the cabinet limits the range of the wifi. I have a second router placed elsewhere which runs my wifi. Currently Ethernet shows connected but no access To the internet. My guess is there is an issue with the iP address as the internet works on wifi with the Ethernet cable disconnected and slowly with it connected. With wifi off the Ethernet still doesn’t connect to internet even though shows green. I guess there is a conflict and would appreciate some advice. Thanks in advance