@TheMaster With access control on, if they cannot get internet, please click here to verify the IP address and gateway. Try to ping the gateway of the VR500v and its internet IP address or ping...

@Rob075 NAT loopback is enabled by default, no option to turn it off on the web UI.

@cantping Theoretically, the ICMP Flood filtering settings won't affect the ping service. You can disable DOS protection to rule out it. Meanwhile, did you ping the WAN IP of the VR400 or the LAN IP...

@tufftone Once the TL-WA901ND connected to the main router, the IP will change, not 192.168.0.254 anymore, instead, it is assigned by the main router. You can login to the web UI of the main router...

@Gofigure Glad to hear that it works better now. FYI, the coverage area of the access point is about 10-15 meters, so the long distance may cause the performance issue, like slow speed or unstable...

@Bagusa4 Okay, have noted this request. If need more help, just let us know.