c6300 modem only for orbi AC3000

Yes, the existing C6300 will be compatible with the Orbi WiFi system.  Some things to note:

• The WiFi radios on the C6300 will need to be disabled so that they do not compete with the Orbi radios.
  My practice is to name each new WiFi router with exactly the same WiFi name (SSID) and password as the previous router.
  That way, (a) all of my WiFi devices will happily connect to the new WiFi system without needing to be reconfigured, and (b) should I decide to "go back" to the previous WiFi router, all I have to do is unplug the new one and activate the old one.
• Most of us on the forum recommend having only a single "router".  Orbi will work just fine when connected to the C6300, however there are a bunch of features that will NOT work when behind another router (OpenVPN, some Gaming apps, etc.)  Here's what Netgear says about "Double NAT": https://kb.netgear.com/30186/What-is-Double-NAT 
• There is also a potential issue when devices are wired directly to the C6300 and the Orbi is in its default "router" mode.  There will be issues trying to access to/from the devices connected to the Orbi and the devices connected to the C6300.  This is another reason to either (a) put the C6300 into "bridge" or "passthrough" mode and have everything connected to the Orbi, or (b) put the Orbi into Access Point (AP) mode.

Hope this helps

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J4B3Z wrote:

So I recently ordered the orbi AC3000 and I currently have the c6300 and I was wondering since the C6300 is a cable modem/router.

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A common configuration for Orbi devices that sit behind a modem/router is as an Access Point. This removes some features, but these may well be present in the modem/router.

It is also easy to turn off the router bit of the C6300. See the bit in the manual:

Change the Router Mode

If you visit the support pages:

Support | NETGEAR

you can feed in the model number and find the documentation, and, if there are any, firmware versions and drivers for your hardware.

Look for the model number on the label on the device.

If the C6300 is still in router mode, then, as CrimpOn suggests, most people say turn off its wifi. My experience is that this is not important, but my Orbi sits on a Powerline Ethernet link and is nowhere near the main router. Having said, that I do turn off the router's wifi in normal use.