WIRELESS and wired LAN do not know each other

My internet provider installed a new cable modem, without capacity WIFI because I have an airport extreme base WIFI (with cable Express extensions).  Speed and quality are OK, wireless and wired, but there seems to be a wall of China between WIFI and wired (LAN): devices that are connected via a cable to my LAN are not visible from the wireless network and vice versa.  Airport extreme is not 'Bridge' mode ("because not of wireless on the new modem capability".)

No idea of the reasons for this?  Thank you very much

Sounds like the configuration of the device. With the airport devices it can operate as a device on the network or another firewall as its own network. I think that it is way jumpered to activate, this will allow you to configure the wireless on the airport, but your current router will do the DNS/DHCP and will be a single network.

Now that you have configured as two routers on an independent network as there is no bridge.

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