@DanL84 EX220 is an ISP provided home grade router which is for basic use. If the firewall/router could use PPPoE connection that would be the perfect case. You can bundle that with some dedicated...

@Boik Make sure that your ISP doesn't use any specific VLAN for Internet connection: or ask your ISP if you need to use a router MAC clone feature:

@Nick82 VR1210v is an ISP provided device which probably doesn't support any mesh technology. Although you can connect the second modem as an AP to the main one using this guide and name its SSIDs...

@Leigh13 You're adding a client when you connect a wireless device to the RE220 wireless SSID. Here's how to configure RE220 using the WPS method.

@M_096 Follow this thread suggestions for your issue.

@PlanktonPete This is an ISP provided modem router with internal antennas. Your ISP should provide any related documentation and guidance. From Italian support website you can see its LEDs...