@djwoodyuk It's recommended that you have only one DHCP server in your local network when using RE700X in RE mode. When you setup RE700X did you disable its DHCP server ? If you didn't, try that and...

@Ciaran211 Yes, you can. For that purpose you'd need an ATA adapter and a SIP account with your ISP.

@TheFriendly To be sure that you get 1 gbps from the ISP, connect a computer directly to the ISP cable and test the bandwidth. If it's correct, you can make a VR400 configuration backup then reset it...

@Shishi22 These are not very informative. Post WAN and LAN settings from HUAWEI router: Post the basic WLAN settings (not advanced): If the RE215 is currently running as a range extender post its...

@Shishi22 In this case if you want to troubleshoot the issue, you should post here some screenshots of your ISP modem model, its Wi-Fi, WAN/LAN settings, as well as the RE215 LAN settings Without...

@Shishi22 Reset the RE215 to its factory defaults by press and hold the reset button for about 10 seconds. Once reset use this video guide to connect RE215 to your ISP modem. Using an ethernet cable...