RAX45-100NAS How to setup Static IP?

> I had a netgear 6900P . [...]

   Connected to what?  What happened to it?

> [...] It was set on a 192.168.1.1 static ip. [...]

   "It"?  A router like this normally has two IP addresses: LAN and
WAN/Internet.  "192.168.1.1" would be the usual default LAN IP address.

> I bought a new netgear from COstco:

   And connected it to what?

> The problem is when I try and setup a static IP to 192.168.xxx the
> internet immediately cuts out.

   _Which_ IP address are you setting?

> [...] set wireless setting back to "choose IP address automatically"
> (172.xxx.xxxx)

   What, exactly, does "wireless setting" mean to you?  Which IP address
is "172.xxx.xxxx"?

> I also noticed in the advanced menu......LAN settings........the ip is
> 10.0.0.1?

   That would suggest that you've connected the WAN/Internet port of
that router to the LAN side of some other router (which is already using
the "192.168.1.*" subnet, so that this router can't).

> SO how do get back to the static IP setting from my previus router
> 192.168.xxx.x??

   Don't cascade multiple NAT routers?

> WHat do I do?

   What _did_ you do?

      https://en.wikipedia.org/wiki/Internet_Protocol
      https://en.wikipedia.org/wiki/IP_address