Second Network, adding AX1800 to RAX200 via network switch GS308PP

> [...] how to setup a second network(AX1800) to my exisiting
> network(RAX200) [...]

   Why?  Is there some actual problem which you are trying to solve?

> Essentially, I have 32 devices on my current network and need to
> alleviate it.

   Why?  What's to "alleviate"?

> [...] using a network switch(GS308PP)? [...]

> Model: GS308|8 ports gigabits unmanaged switch

   Which is it?

> [...] AX1800 [...]

   "AX1800" is a speed, not a model number.  Look for "Model" on the
product label.

> [...] I have a nokia fiber modem provided by COX [...]

   Has it an actual model number?

> Initially, when I fed the modem line into the switch and connected
> both router and mesh, all heck broke loose and the switch alternated
> activitiy between the two routers. [...]

   Because that was a bad idea.  Typical residential service (like
yours, I assume), would allow you to connect one device directly to your
(unspecified) "a nokia fiber modem".  That could be a computer, or a NAT
router (like your RAX200).  Adding a network switch would not change
that.

> My brother suggested feeding the modem into my RAX200 then connect the
> mesh(AX1800) to RAX200 [...]

   That might be an improvement, but you'd probably want to configure
your "the mesh(AX1800)" as a wireless access point.  The User Manual for
that device (whatever it is) should explain how to do that.

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.
Look for "access point".

> [...] but the netgear app doesnt recognixe the AX1800.

   I use a web browser instead of any Netgear-supplied app.  That's also
covered in the relevant User Manual(s).

   Configuring a router as a WAP will give it a new LAN IP address.  By
default ("Get dynamically from existing router"), it'll get that new
address from (the DHCP server in) your main router (RAX200).  Hence, an
"Attached Devices" report from your main router should tell you what
the new address of your router-as-WAP is. Point your web browser at
that IP address to talk to the router-as-WAP.  (That might become clearer as you
do the mode change on the router-as-WAP-to-be.)

> I recommend you post over in the managed switch forum for this:

   Sounds to me like a mistake.  The switch (whatever it is) is not the
source of your problem(s).  (What you tried to do with it was.)