@DamienScreen Check Chapter 7.1 from your C4000 user guide and this guide for configuring the access of a USB storage device. There's a possibility that the power provided by the C4000 USB ports is...

@DADDA The best scenario is to have a public static IP address on your VR300 Internet interface. If it's a public dynamic IP address you can mitigate this registering no-ip.com or use the TP-Link...

@DADDA Yes, if that's the case then that's the reason for your issue and the port forwarding won't work as expected. You can't set a public IP address by yourself - you need to contact your ISP to...

@impneeraj Theoretically you can run a 100m ethernet cable CAT5E without an issue between the two routers. If that's not possible (due to your infrastructure characteristics) the only option is to...

@ukmartian Well, that's a matter of FW implementation and the document in questrion dates from 10-29-2019 - meanwhile it has been implemented on M4 as well I presume.

@ukmartian It's the former. Read the notes on the bottom of this guide.