2 Home WiFi Routers connected via ethernet, how to create PRIVATE and GUEST wireless?

Hello - I have scoured the DD-WRT forums and found several articles that are close but I'm not sure any are what I need.  I have a Primary and Secondary Wifi router connected over ethernet, through a switch, in my home.  A WRT54g (with DD-WRT firmware) is primary and a TP-Link Archer C5 (with stock firmware) is Secondary.  I would like to make the WRT54g as 'router only', turning off radios, and make the TP-Link  'AP-only'  What is the best way to accomplish creating a PRIVATE and PUBLIC (where public clients can connect to each other - for gaming) network and where the PUBLIC does not have access to the PRIVATE network?  I have seen references to creating separate VLANs or separate subnets to accomplish this but not sure which is better/easier.  I believe the CFG would be within the primary Router in DD-WRT, to dictate the network cfg.  Thanks for your insight!
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davisAsked:
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Fred MarshallPrincipalCommented:
It's covered on the user manual page 59.  All the settings you need appear to be there.
Choose menu “Advanced→Guest Network”,
Benjamin VoglarIT ProCommented:
Connect TP-Link to modem. SSID (Private), configure it that have 192.168.1.0 network. Connect your WRT to port 1 or 2 or 3 ... (on TP-LINK) Set up WRT to static wan IP 192.168.1.10 (SSID GUEST) and give him internal address space 192.168.2.0. Users who Will acess to GUST SSID Will not be able to see the private netwok. I hope you understand.

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davisAuthor Commented:
I see your solutions uses subneting to segregate the networks.  I may need to swap the routers in your example, i'll test.  the WRT may be the the better device connected to the modem in this situation, since it has more functional firmware (DD-WRT).
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