RT-AC68P Network subnetting

[Oscar G]

I have an Asus RT-AC68P Router running on Merlin 380.68 Firmware.
I would like to have separate networks for IoT devices, computers, smartphones/tablets. Apart from safety benefits, will I get any performance benefits from splitting up my network? I am trying to setup my network for optimal streaming performance on android boxes and firesticks. I just did a speed test on Speedtest.net and my download speed is 90Mbps.
I will also like to setup a network just for guest where they can only access the internet and printer.
Would I need any additional hardware to accomplish my goals?
Any and all advice is greatly appreciated. Thanks

 

[ColinTaylor]

Asus routers only support a single network. You can create up to 6 wireless guest networks each of which can be setup with or without access to the intranet, but they are not subnets.

 

[Oscar G]

So would I need a managed switch or a different router to accomplish this?

 

[ColinTaylor]

If your objective is "performance" then creating a complex network with multiple subnets connected with multiple routers is not going to help matters. If anything it'll make things worse.

Wireless devices can be isolated from each other and/or your intranet by using guest wireless networks, but that doesn't help with wired devices.

There are some ugly hacks that can be done to the Asus firmware to create port based VLANs, or you might be better served by using a third party firmware like Tomato. But that only gives you one VLAN for each LAN socket and doesn't allow you to effect "performance". For that you'd need some sort of managed switch with support for traffic shaping and/or QoS (and VLANs and probably routing to subnets).