This post is based on the NETGEAR router R6300 V2. It is not guaranteed to be feasible in other environments.
1, Flush OpenWrt firmware
Check support firmware
After downloading the firmware, log in to the router management page. Select “Advanced” – “Management” – “Firmware Upgrade”, upload the firmware and wait for about 5 minutes.
Note: The 5G drive of R6300 V2 is not open although Openwrt supports 802.11ac 5G network.
After the firmware is installed, log in to the router management page select Network-Interfaces.
Modify WAN parameters connection to the Internet.
Other wireless settings under the Network-Wifi option.
2, Configure the guest network and limit its bandwidth
You can find them in luci.
Configure the guest network after installation
Create a new interface
log in to the router management page-Network-Interfaces-Add new interface
I renamed it ‘GUEST’
Change the protocol to a static address
Filling subnet mask
Open DHCP service at the bottom of the page
Firewall settings choose lan
Configuring wireless for the guest network
Choose the appropriate frequency band Add
Network settings choose Guest
Limit guest network bandwidth
Select the corresponding guest network name under the interface name option
Download speed actually is upload speed
Upload speed is download speed
Enabled after configuration
Finally, go to Network-Wifi to open the guest network.